Certkiller.4A0-102 {135q} - GRATIS EXAM

Certkiller.4A0-102 {135q}

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4A0-102

Alcatel-Lucent Border Gateway Protocol

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Exam A

QUESTION 1Which of the following best describes the relationship between locally configured policies and the direction of traffic?

A. Import policies affect the way the local AS receives traffic, while export policies affect the way itsends traffic.B. Import policies affect the way the local AS sends traffic, while export policies affect the way itreceives traffic.C. Both import and export policies affect the way the local AS receives traffic, but not the way itsends traffic.D. Both import and export policies affect the way the local AS sends traffic, but not the way itreceives traffic.

Correct Answer: BSection: (none)Explanation

Explanation/Reference:Explanation:

QUESTION 2What is the result of configuring the following policy statement as a BGP import policy on the Alcatel- Lucent 7750 SR?

A. All BGP routes are rejected.B. All BGP routes are accepted.

C. All routes matching prefix list "List-1" are rejected.D. All BGP routes matching prefix list "List-1" are rejected.

Correct Answer: DSection: (none)Explanation

Explanation/Reference:well defined answer.

QUESTION 3An Alcatel-Lucent 7750 SR is configured with a local preference of 250. If it receives a BGP update with a local preference of 500, what local preference is sent toits eBGP peers?

A. 100B. 250C. 500D. None


Explanation/Reference:answer is right.

QUESTION 4Which of the following regarding BGP confederations is FALSE?


A. A confederation is a collection of Autonomous Systems advertised as a single AS number toBGP speakers outside the confederation.B. Each member AS must either maintain a full mesh of iBGP sessions, or use route reflection.

C. Confederations can be used to subdivide ASs that have a large number of BGP speakers intosmaller domains.D. A full mesh of intra-confederation eBGP sessions is required between the member ASs.


Explanation/Reference:authentic answer.

QUESTION 5Click the exhibit.

Routers RR1 and RR2 are route reflectors with the same Cluster-ID. When the update for prefix 192.168.1.0/27 is received at router RA2, what are theOriginator_ID and Cluster_List attributes?

A. Originator_ID of RR1; and Cluster_List of 10.16.10.1.B. Originator_ID of RX; and Cluster_List of 10.16.10.1.C. Originator_ID of RR1; and the Cluster_List is not set.D. Neither the Originator_ID nor the Cluster_List is set.

Correct Answer: D

Section: (none)Explanation

Explanation/Reference:great image.


Router R6 is a route reflector for clients R1, R2 and R5 with local preferences 100, 200 and 500 respectively. Router R3 advertises prefix 192.168.1.0/27 to routersR1, R2 and R5 which are configured with advertise-external. Routers R4 and R6 are both configured with "add-paths ipv4 send 2 receive". Which routes to192.168.0.1/27 is router R4 expected to have in its BGP routing table?

A. The routes from routers R1, R2 and R5.B. The routes from routers R1and R2.C. The routes from routers R2 and R5.D. Two routes are chosen at random and advertised to router R4.

Correct Answer: CSection: (none)Explanation


QUESTION 7Which of the following best describes the purpose of advertise-external?

A. It enables a BGP speaker to advertise multiple external routes to iBGP peers.B. It enables a BGP speaker to advertise its best external route to iBGP peers when the bestoverall route is internal.C. It enables a BGP speaker to advertise its best external route to eBGP peers without an importpolicy.D. It enables a BGP speaker to advertise its best internal route to eBGP peers without an exportpolicy.




Router R6 is a route reflector with clients R1, R2, R4 and R5. R4 receives three routes from router R6 and is configured with ECMP 3. Given the following BGPconfiguration on router R4, how many primary and backup paths will be present in router R4's BGP routing table?

A. Two primary paths and one backup path.B. One primary path and two backup paths.C. Three primary path and one backup path,D. Three primary paths.




Router R1 is a route reflector with clients R2, R5 and R6. Prefixes advertised by router R5 have a local preference of 200. Router R3 advertises the prefix192.168.1.0/27 to routers R5 and R6. Assuming that router R6 is configured with "advertise-external", what is the expected output of "show router bgp routes" whenexecuted on router R5?

A. Option AB. Option BC. Option CD. Option D


Explanation/Reference:true answer.

QUESTION 10Which of the following statements regarding BGP Add-Paths is FALSE?

A. Add-Paths allows non-best paths to be advertised to a peer.B. Add-Paths capabilities are exchanged between peers after the BGP session is established.C. A BGP speaker must advertise the capability to receive multiple paths from its peer.D. A BGP speaker must advertise the capability to send multiple paths to its peer.




Router R6 is a route reflector for clients R1, R2 and R5. Router R5 is configured with a local preference of 200. On which routers is "advertise-external* needed forrouter R6 to receive exactly two distinct routes for prefix 192.168.1.0/27?

A. On router R5 only.B. On either router R1or R2.C. On both routers R1and R2.D. On all routers R1, R2 and R5.




Router R1 is a route reflector with clients R2, R5 and R6. Router R3 advertises the prefix 192.168.1.0/27 to routers R5 and R6. Assuming that routers R1, R2 andR4 are configured with "add- paths ipv4 send 2 receive", what is the expected output of "show router bgp routes" when executed on router R2?


Correct Answer: ASection: (none)Explanation


QUESTION 13

Click the exhibit.

Router R1 is a route reflector with clients R2, R5 and R6. Prefixes advertised by router R5 have a local preference of 200. Router R3 advertises the prefix192.168.1.0/27 to routers R5 and R6. Assuming that none of the routers in AS 65540 is configured with "advertise-external", what is the expected output of "showrouter bgp routes" on router R2?



Explanation/Reference:efficient answer.:

QUESTION 14Which of the following statements regarding BGP control plane convergence is FALSE?

A. Core and edge node failure recovery depends on IGP convergence.B. Edge neighbor failure is detected by the eBGP session timeout.C. BGP control plane convergence is independent of number of affected prefixes.D. Upon BGP control plane convergence, an optimal path is installed in the FIB.




Assuming router A is configured with "next-hop-self", what does the BGP update for prefix 192.168.0.1/27 contain when it arrives at router B?

A. AS Path of 65200 65100, Next Hop of router A.B. AS Path of 65200 65100, Next Hop of router E.C. AS Path of 65100, Next Hop of router A.D. AS Path of 65100, Next Hop of router E.


Explanation/Reference:

Explanation:

QUESTION 16What kind of BGP attribute is the Multi_Exit_Disc?


A. Optional transitive attribute.B. Optional non-transitive attribute.C. Well-known mandatory attribute.D. Well-known discretionary attribute.



QUESTION 17Which of the following organizations would an ISP based in Europe approach for an IP prefix assignment?

A. ARINB. ICANNC. RIPE NCCD. LACNICE. APNIC



really great answer.

QUESTION 18Which of the following is TRUE if a BGP session state is Connect?

A. BGP is waiting for the TCP connection to be completed.B. BGP has established a TCP connection, and an Open message has been sent to that neighbor.C. The BGP session has been interrupted, and a TCP connection is being re-established.D. BGP has failed to establish a TCP connection to that neighbor, and ConnectRetry has beenreset to zero.



QUESTION 19Which of the following regarding the connections between eBGP peers is TRUE?

A. eBGP peers typically use system addresses for session establishment.B. eBGP peers are managed under a single administration.C. eBGP peers do not propagate updates learned via iBGP.D. eBGP peers are usually directly connected to each other.



QUESTION 20Click on the exhibit.

AS 65540 is using MPLS to provide BGP shortcuts for its iBGP routing. AS 65541 is advertising prefix 192.168.1.0/27 into BGP. Which routers have the BGPupdate for the advertised prefix in their BGP table?

A. Routers R1, R2, R3, R4 and R5.B. Routers R1and R4 only.C. Routers R1, R2, R3 and R4 only.D. Routers R1, R4 and R5 only.



QUESTION 21Which of the following parameters does NOT have to match for an iBGP session to be successfully established?

A. BGP version number.B. The local AS number.C. The Hold Time.D. Authentication.



Explanation:

QUESTION 22Which of the following regarding the TTL of a BGP message is TRUE?

A. TTL is a well-known mandatory BGP attribute.B. The default TTL value of an eBGP message is 1, and 64 for an iBGP message.C. The default TTL value of an iBGP message can be modified using the multihop command.D. The default TTL value of an eBGP message can be modified using the "ttl-security"command.



QUESTION 23Which of the following about a single-homed AS is FALSE?

A. A single-homed AS is also known as a stub AS.B. A single-homed AS is also known as a leaf AS.C. A single-homed AS uses either the ISP AS number or a private AS number.D. A single-homed AS can be either transit or non-transit




Which of the following about the relationship between ISP 1 and ISP 3 is TRUE?

A. ISP 1 is downstream from ISP 3 and is expected to push more traffic toward ISP 3 than it pullsfrom it.B. ISP 3 is downstream from ISP 1 and is expected to push more traffic toward ISP 1 than it pullsfrom it.C. ISP 1 is downstream from ISP 3 and is expected to pull more traffic from ISP 3 than it pushestoward it.D. ISP 3 is downstream from ISP1 and is expected to pull more traffic from ISP 1 than it pushestoward it.



QUESTION 25Which of the following statements about an autonomous system is FALSE?

A. An AS is a set of routers under a single technical administration.B. An AS efficiently advertises all IGP known routes to other ASs.C. An AS presents a consistent routing policy to other autonomous systems.D. An AS has a 2-byte or 4-byte AS number assigned.



QUESTION 26Which of the following regarding the atomic aggregate attribute is TRUE?

A. It is an optional transitive attribute.B. It is an optional non-transitive attribute.C. The atomic aggregate flag is always set if the aggregator attribute is set.D. The atomic aggregate flag is always set if the AS Path information is lost due to aggregation.


Explanation/Reference:exact answer.

QUESTION 27Based on the default settings for the Alcatel-Lucent 7750 SR, when a policy change is made and committed, what action is required by the user for the change totake effect?

A. Execute a command to re-evaluate all routes in the Local-RIB against the configured exportpolicies.B. Execute a command to re-evaluate all routes in the RIB-In against the configured importpolicies.C. Execute a command to reset the BGP session with the affected peer or peers.D. No further action is required.


Explanation/Reference:absolute.

QUESTION 28Which of the following statements regarding BGP route selection is TRUE?

A. Lower local preference is preferred over higher local preference.B. Higher MED is preferred over lower MED.C. Higher origin code is preferred over lower origin code.D. Lower BGP router ID is preferred over higher BGP router ID.


Explanation/Reference:definite answer.

QUESTION 29Which of the following regarding BGP authentication on the Alcatel-Lucent 7750 SR is FALSE?

A. Authentication is performed before establishing the BGP session.B. Authentication can only be configuredon the group or neighbor level.C. By default, MD5 authentication is disabled.D. Peer authentication may be optionally requested in an open message.


Explanation/Reference:reliable.

QUESTION 30

Which of the following describes BGP route processing on the Alcatel-Lucent 7750 SR?


A. If no import policy is specified, all valid BGP routes are passed to the BGP route selectionprocess.B. If no export policy is specified, all non-BGP routes are populated into RIB-Out.C. If no import policy is specified, all BGP routes are populated into the route table.D. If no import policy is specified, only valid BGP routes are populated into RIB-Out.


Explanation/Reference:true.

QUESTION 31An Alcatel-Lucent 7750 SR is configured with a policy to export directly-connected networks to BGP. Which of the following commands verifies that the export wassuccessful?

A. show router route-tableB. show router bgp routesC. show router bgp routes <prefix> huntD. show router bgp neighbor <ip-address> received-routes


Explanation/Reference:fit answer.

QUESTION 32

An Alcatel-Lucent 7750 SR receives two updates for the same route with local preferences 200 and 300, respectively. What local preference is sent to eBGPpeers?

A. 100B. 200C. 300D. None



QUESTION 33An Alcatel-Lucent 7750 SR receives a route from an eBGP peer without a MED. What MED value is sent to iBGP peers?

A. 100B. 250C. The IGP costD. None



QUESTION 34Which of the following is NOT a goal of BGP routing policies?

A. To protect external networks from instability.B. To communicate the architecture of an AS to external ASs.C. To protect the local AS and other external ASs from bad NLRI.D. To optimize ingress and egress traffic patterns to best serve the users of the AS.

Correct Answer: B




AS 65550 owns CIDR block 10.64.0.0/12. Router R6 advertises the aggregate 10.64.0.0/12 to AS 65541 with "as-set" enabled. Which of the following is TRUEregarding the aggregate route received by router R7?

A. The AS Path is set to 65540, and the Atomic Aggregate flag is set.B. The AS Path is set to 65540 65550, and the Atomic Aggregate flag is set.C. The AS Path is set to 65540 65550, and the Atomic Aggregate flag is not set.

D. The AS Path is set to 65550, and the Atomic Aggregate flag is not set.



QUESTION 36Assuming that "client1" and "client2" are directly-connected networks, what is the result of executing the following BGP export policy?

A. "client1" routes will be tagged with communities "North" and "West".B. "client1" routes will be tagged with community "West".C. "client1" routes will be tagged with community "North".D. "client1" routes will be rejected.

Router R2 receives a route to 192.168.1.0/27 from router R4, and sets the local preference to 110. Router R1 receives a route to 192.168.1.0/27 from router R3,and sets the local preference to 80. Both ASs have a full iBGP mesh. What path does traffic destined to 192.168.1.0/27 take from router R1?

A. R1-R3-R8B. R1-R2-R4-R8C. R1-R3-R4-R8D. R1-R2-R4-R3-R8



QUESTION 38How are policy direction and data flow related on the Alcatel-Lucent 7750 SR?

A. Import policies affect ingress data flow.B. Export policies affect ingress data flow.C. Both import and export policies affect ingress data flow.D. Policy direction and data flow are independent.



QUESTION 39Which of the following prefix-lists is the most specific match for prefix 172.31.2.1/24?

A. Prefix 172.16.0.0/12 longer.B. Prefix 172.31.0.0/22 longer.C. Prefix 172.31.0.0/23 longer.D. Prefix 172.31.0.0/24 exact.

Correct Answer: B



QUESTION 40Which of the following commands would correctly configure the confederation AS number as 65200 with a member AS of 65202?

A. config>router- confederation 65200 members 65202B. config>router>bgp= confederation 65200 members 65202C. config>router= confederation 65202 members 65200D. config>router>bgp= confederation 65202 members 65200



QUESTION 41Which of the following regarding BGP confederations is FALSE?

A. The entire confederation is viewed as a single AS by an eBGP peer.B. Within a confederation, each member AS is considered as a stand-alone AS.C. Member ASs within a confederation can use route reflection.D. Member ASs must be fully meshed within a confederation.



QUESTION 42What is the function of the Cluster_List attribute?

A. It is used for loop detection within the same cluster.B. It is used for loop detection between clusters.C. It is used for loop detection in a confederation.D. It is used to identify the route reflectors within an AS.




Router R6 is a route reflector with clients R1, R2 and R5. Router R3 advertises the prefix 192.168.1.0/27 to routers R1, R2 and R5. How many routes for prefix192.168.1.0/27 will router R6 receive?

A. 1B. 2

C. 3D. None



QUESTION 44Which of the following statements regarding BGP FRR is FALSE?

A. The router must receive several BGP routes to compute a backup path.B. BGP FRR can be triggered by BFD.C. The backup path can use the same next hop as the primary path.D. BGP peer-tracking can be used to improve BGP FRR failure detection times.



QUESTION 45Which of the following routes is NOT considered an internal route?


A. A route received from a BGP peer within the same AS.B. A route originated by a router in a different cluster of the same AS.C. A route received from a BGP peer from a different member AS of a confederation.

D. A route received from a BGP peer from the same member AS of a confederation.




Assuming that none of the routers within AS 65200 is configured with next-hop-self", what will the BGP update for the 192.168.0.1/27 prefix contain when it arrivesat router B?

A. AS Path of 65200 65100, Next Hop of router A.B. AS Path of 65200 65100, Next Hop of router E.C. AS Path of 65100, Next Hop of router E.D. AS Path of 65100, Next Hop of router A.


Explanation/Reference:appropriate answer.

QUESTION 47Which of the following is NOT a BGP message type?

A. Route-RefreshB. OpenSentC. NotificationD. UpdateE. Keepalive


Explanation/Reference:Best.

QUESTION 48Which of the following is TRUE if the local state of BGP is OpenConfirm?

A. The local system has received a Keepalive message and is ready to exchange updates.B. The local system is exchanging Update messages with its neighbor.C. The local system has sent a Keepalive message to its neighbor and is waiting to receive oneback.D. The local system has sent an Open message to its neighbor and is waiting to receive one back.


Explanation/Reference:right.

QUESTION 49Which of the following regarding the withdrawal of routes from one BGP speaker to another is TRUE?

A. An update message is used. Only a single prefix can be withdrawn at a time.B. An update message is used. Multiple prefixes can be withdrawn at a time.

C. A withdraw message is used. Only a single prefix can be withdrawn at a time.D. A withdraw message is used. Multiple prefixes can be withdrawn at a time.




After router A receives the BGP update for the 10.3.3.0/24 prefix, which routers will the route be propagated to?

A. All routers with which it has a BGP session.B. All routers with which it has a BGP session, except the router it received the update from,whichis router B.C. All routers with which it has a BGP session, except the router it received the update from, whichis router C.D. All routers with which it has a BGP session, except the router it received the update from, whichis router D.E. Only eBGP neighbors.

Correct Answer: ESection: (none)Explanation


QUESTION 51What kind of attribute is the aggregator?

A. Well-known mandatoryB. Well-known discretionaryC. Optional transitiveD. Optional non-transitive




If router A originates a BGP route for prefix 192.168.0.1/27, what will the update contain when it reaches router B?

A. AS Path of 65200, Next Hop of router A, Origin of IGP.B. AS Path of 65200, Next Hop of router A, Origin of incomplete.C. Null AS Path, Next Hop of router A, Origin of IGP.D. Null AS Path, Next Hop of router A, Origin of incomplete.




Over which BGP session will router B learn the 10.1.1.0/24 prefix?

A. The session between router A and router B.

B. The session between router C and router B.C. The session between router D and router B.D. Router B will learn the prefix over all of the sessions, then it will choose the best route.



QUESTION 54An Alcatel-Lucent 7750 SR has the BGP configuration shown below. Assuming the router has established BGP sessions to routers R1 and R2, which of thefollowing is TRUE?

A. Both neighbors R1and R2 should be part of AS 65540.B. Neighbor R1should be part of AS 65550, while neighbor R2 should be part of AS 65540.C. Neighbor R1should be part of AS 65550, while neighbor R2 should be part of AS 65560.D. Both neighbors R1and R2 should be part of AS 65560.



QUESTION 55Which of the following prefix lists include prefixes 192.168.128.0/17 and 192.168.64.0/18?

A. Prefix list 192.168.0.0/16 through 18.B. Prefix 192.168.0.0/17 longer.C. Prefix list 192.168.0.0/17 through 18.D. Prefix 192.160.0.0/13 longer.



QUESTION 56An Alcatel-Lucent 7750 SR receives a route from an eBGP peer with a MED value of 500. What MED value is sent to iBGP peers?

A. 100B. The IGP costC. 500D. None



QUESTION 57

Click the exhibit.

Router R2 is advertising prefix 192.168.1.0/27 with community "no-advertise" towards AS 65002.

Which routers receive an update for that prefix?

A. Router R3 only.B. Routers R3 and R4 only.C. Routers R3, R4 and R5 only.D. Router R2 does not advertise an update for the prefix.




Given the following configuration of router R1, what can be said about the function of each of AS 65540s routers?

A. Routers R1 and R2 are redundant route reflectors with clients R3 and R4.B. Routers R3 and R4 are route reflectors with clients R1 and R2.C. Router R1 is a route reflector with clients R2, R3 and R4.

D. Router R1 is a route reflector with clients R3 and R4.




AS 65100 is advertising 192.168.1.0/27 into BGP. Which of the following AS Paths would the prefix 192.168.1.0/27 contain when viewed on router R8?

A. 65200 (65206 65202) 65100B. (65206 65202)65100C. 65250 (65206 65202) 65100D. 65200 65100

Correct Answer: DSection: (none)

Explanation


QUESTION 60A confederated AS is comprised of three members. One member is comprised of 4 routers, while the other two members are comprised of 3 routers each.Assuming member ASs are fully meshed and use full mesh iBGP, what is the required number of BGP sessions within the confederation?


A. 12B. 13C. 14D. 15



QUESTION 61Two Alcatel-Lucent 7750 SRs are established BGP peers with the following add-paths configuration:R1: configure router bgp add-paths ipv4 send 4 receiveR2: configure router bgp add-paths ipv4 send 2

If router R1 advertises three routes for a given prefix X, how many routes is router R2 expected to have for prefix X?

A. NoneB. 2C. 3

D. 4



QUESTION 62Which of the following statements regarding BGP Fast Reroute is FALSE?

A. BGP Fast Reroute is triggered by IGP events.B. The backup path is pre-computed and installed in the FIB.C. BGP Fast Reroute is independent of number of affected prefixes.D. BGP Fast Reroute uses the optimal path to the destination.




Router R6 is a route reflector with clients R1, R2, R4 and R5. Router R4 receives three routes from router R6 and is configured with ECMP 3. Given the followingBGP configuration on routerR4, how many primary and backup paths will be present in router R4's BGP routing table?

A. Three primary paths,B. Two primary paths and one backup path.C. One primary path and two backup paths.D. One primary path and one backup path.



QUESTION 64What will happen if an update is received with an unrecognized optional non-transitive attribute?

A. The router will accept the update and send a notification.B. The router will not accept the update and send a notification.C. The router will accept the update and ignore the attribute.D. The router will accept the update and propagate the attribute.

Considering that both routers C and D are advertising the eBGP learned prefix 10.5.0.0/16 into ISP X, which of the following best describes the route advertisementwithin ISP X?

A. Router C sends the update to routers E and F only.B. Router C sends the update to routers D, E and F.C. Router C sends the update to routers A, B, E and F.D. Router C sends the update to routers A, B, D, E and F.




Given that ISP 1 and ISP 2 are Tier 2 providers, and that ISP 3 and ISP 4 are Tier 1 providers, what is the most likely relationship between ISP 1 and the otherISPs?

A. ISP 1 has a peering relationship with ISP 2 and ISP 4.B. ISP 1 has a peering relationship with ISP 2 and a transit relationship with ISP 3.C. ISP 1 has a peering relationship with ISP 2 and ISP 3.D. ISP 1 has a transit relationship with ISP 2 and ISP 4.E. ISP 1 has a transit relationship with ISP 2 and a peering relationship with ISP 3.



QUESTION 67A router in AS 65100 receives two BGP routes. The first route is for 138.1.1.0/24 with an AS Path of 65200 65300, Local Preference of 100, MED of 100, androuter ID 10.10.10.10. The second route is for 138.1.0.0/16 with an AS Path of 65500 65300, Local Preference of 150, MED of 100, and router ID 10.1.1.1.Assuming all other attributes are equal, which route would be used to forward an IP packet with destination IP address 138.1.1.1?

A. The first BGP route.B. The second BGP route.C. Both routes are used.D. It is impossible to determine without the value of the origin code for both routes.



QUESTION 68What is the purpose of configuring a triggered-policy on an Alcatel-Lucent 7750 SR?

A. Policy changes are delayed until the peer router with the affected routes reboots.B. Policy changes are delayed until route updates for affected BGP routes are received frompeers.C. Policy changes are delayed until BGP sessions are cleared or BGP is reset.D. Policy changes are delayed until the router reboots.



QUESTION 69Assuming that "client1" and "client2" are directly-connected networks, what is the result of executing the following BGP policy?

A. "client2" routes will be tagged with communities "West" and "North".B. "client2" routes will be tagged with communities "West", "North" and "South".C. "client2" routes will be tagged with community "West".D. "client2" routes will be tagged with community "South".



QUESTION 70Router R1, in AS 65540, has the export policy shown below. It advertises an aggregate route to eBGP peer router R2 in 65550. What is the AS Path of theaggregate route received by router R2?

A. 65540B. 65540 1C. 65540 65540D. 65550 65540




Given the following configuration for router R1, what is the expected Next Hop for prefix 192.168.1.0/27 as seen on router R2?

A. 10.0.2.1B. 10.0.2.2C. 10.16.10.1D. 10.16.10.3



QUESTION 72What class of attribute is Originator_ID?

A. Well-known mandatory.B. Well-known discretionary.C. Optional transitive.D. Optional non-transitive.


Explanation/Reference:correct.

QUESTION 73What is the default Alcatel-Lucent 7750 SR TTL of a BGP advertisement between confederation members?

A. 1B. 32C. 64D. 255


Explanation/Reference:answer is updated.



AS 65540 routers are iBGP fully-meshed. Assume routers R4, R5 and R6 are configured with addpaths ipv4 send 2 receive". Which routes to 192.168.0.1/27 isrouter R6 expected to have in its BGP routing table?

A. Two routes from router R4.B. Two routes from router R5.C. Two routes; one from router R4 and one from router R5.D. Four routes; two from router R4 and two from router R5.


Explanation/Reference:valid answer.


AS 65540 routers are iBGP fully-meshed. Prefixes advertised by router R2 have a local preference of 200. Router R1 advertises the prefix 192.168.1.0/27 torouters R2 and R3. Assuming that router R3 is configured with "advertise-external", what is the expected output of "show router bgp routes" when executed onrouter R4?





When router A receives the BGP update for the 192.168.0.1/27 prefix, it propagates it to routers B and

A. What action is taken by router B when it receives the update?B. Router B propagates the BGP update to routers D and C.C. Router B propagates the BGP update to router D.

D. Router B detects duplicates in its BGP database and discards the update.E. Router B propagates the update to routers A, C and D.



QUESTION 77How is the aggregator attribute handled with 32-bit AS numbers?

A. With the same method and attribute as 16-bit AS numbers.B. With the same method as 16-bit AS numbers, but using the AS4_Aggregator attribute.C. Aggregation is not yet supported with 32-bit AS numbers.D. By using a dummy value of 23456 in the 16-bit AS aggregator field. This value lets the routerknow it needs to read the 32-bit AS number that is contained in the

nextTLV.



QUESTION 78A BGP session is in OpenConfirm state. Which of the following messages must be received to transition to Established state?

A. UpdateB. OpenC. NotificationD. Keepalive



Explanation:

QUESTION 79A router in AS 65100 receives three routes for 138.120.0.0/16. The first route has an AS Path of 65200 65400 65300 and a local preference of 150. The secondroute has an AS Path of 65200 65300 and a local preference of 100. The third route has an AS Path of 65600 65300 and a local preference of 100.Which route will appear in the RIB-out?

A. Only the first route will appear in the RIB-Out.B. Only the second route will appear in the RIB-Out.C. Only the third route will appear in the RIB-Out.D. All routes will appear in the RIB-Out.



QUESTION 80The configuration of an Alcatel-Lucent 7750 SR is given below. Router Rl has established BGP sessions with routers R2 and R3. Which of the following is TRUE?

A. Router R1forms an iBGP session with router R2, and an eBGP session with router R3.B. Router R1forms iBGP sessions with routers R2 and R3.C. Router R1forms eBGP sessions with routers R2 and R3.D. The types of BGP sessions with routers R2 and R3 cannot be determined.



QUESTION 81What is the result of configuring the following policy statement as a BGP import policy on the Alcatel- Lucent 7750 SR?

A. All BGP routes are accepted.B. All routes matching prefix lists "List-1" and "List-2" are rejected.C. BGP routes matching prefix lists "List-1" or "List-2" are rejected.D. BGP routes matching prefix lists "List-1" and "List-2" are rejected.



QUESTION 82Which of the following regarding route reflectors is TRUE?

A. Only the route reflector is configured with a cluster id.B. There can only be one route reflector in a cluster.C. Clients should have iBGP sessions with each other to maintain the mesh.D. There can only be one level of route reflectors in the topology.

Correct Answer: ASection: (none)

Explanation



Which of the following is a valid confederation configuration for Router R2?


Router R1 is a route reflector with clients R2, R5 and R6. Prefixes advertised by router R5 have a local preference of 200. Router R3 advertises the prefix192.168.1.0/27 to routers R5 and R6. Assuming that none of the routers in AS 65540 is configured with "advertise-external", what is the expected output of "showrouter bgp routes" on router R5?




QUESTION 85Which of the following regarding BGP Path Identifier is FALSE?

A. Path-ID is a four-octet identifier pre-pended to the NLRI field of a BGP update.B. Path-ID is an optional transitive attribute used to advertise multiple paths.

C. Path-ID uniquely identifies each path advertised to a neighbor.D. A BGP speaker that re-advertises a route must generate its own Path-ID.




Router R1 is a route reflector with clients R2, R5 and R6. Prefixes advertised by router R5 have a local preference of 200. Router R3 advertises the prefix192.168.1.0/27 to routers R5 and R6. Assuming that router R6 is configured with "advertise-external", what is the expected output of "show router bgp routes" whenexecuted on router R1?




QUESTION 87Which of the following regarding "well-known discretionary'' BGP attributes is TRUE?

A. They must be recognized by all peers and included in all BGP updates.B. They are discarded if not recognized by the recipient.C. They must be recognized by all peers and optionally included in BGP updates.D. The receiving router sends a notification if a well-known discretionary attribute is not present inan update.



QUESTION 88Which of the following is NOT considered an option of export policies?

A. Advertising customer networks into BGP.B. Sending aggregates that summarize the AS s address space.C. Sending MEDs to influence ingress traffic from peers.D. Preventing unwanted NLRI from entering the AS.



QUESTION 89Upon the successful establishment of a TCP session between peers, what type of BGP message is exchanged?

A. OpenSentB. Keepalive

C. OpenD. NotificationE. Update




An update travels from AS 135000 to AS 137000, traversing both 32-bit and 16-bit AS paths.

What will the AS Path be when the update reaches AS 137000?

A. 140000 200 135000B. 137000 140000 200 135000C. 140000 23456 135000D. 135000 200 140000



QUESTION 91Which of the following is FALSE regarding the 16-bit public autonomous system numbers?

A. They are allocated to the RIRs by ICANN/IANA.B. They are used when connecting ASs on the Internet.C. They range from 1 to 56319.D. They are assigned by the ISPs for enterprise networks.




Given that ISP 1 and ISP 2 are Tier 2 providers, and that ISP 3 and ISP 4 are Tier 1 providers, what is the most likely relationship between the ISPs?

A. ISP 1 and ISP 2 have a public transit relationship, while ISP 3 and ISP 4 have a private transitrelationship.B. ISP 1 and ISP 2 have a private transit relationship, while ISP 3 and ISP 4 have a public transitrelationship.C. ISP 1 and ISP 2 have a private peering relationship, while ISP 3 and ISP 4 have a publicpeering relationship.D. ISP 1 and ISP 2 have a public peering relationship, while ISP 3 and ISP 4 have a privatepeering relationship.




If router A originates an update for prefix 192.168.0.1/27, what will the update contain when it reaches router B?

A. AS Path of 65200, local-preference of 100.B. AS Path of 65200, local-preference of None.C. Null AS Path, local-preference of 100.D. Null AS Path, local-preference of None.



QUESTION 94BGP is configured on two peers, routers A and B. Router A is configured with a Hold Time timer of 60 seconds and a Keepalive timer of 25 seconds. Router B isconfigured with a Hold Time timer of 90 seconds and a Keepalive timer of 70 seconds. What will the active Keepalive timer be on router B?

A. 70 secondsB. 25 seconds

C. 20 secondsD. 30 seconds



QUESTION 95Which of the following statements about the BGP Advertise External feature is FALSE?

A. It modifies the BGP advertisement logic.B. It improves convergence times and allows for better load sharing.C. It allows a router to advertise multiple external paths for a single prefix.D. It supports both IPv4 and IPv6.



QUESTION 96From what range are 16-bit private AS numbers selected?

A. 64496 64511B. 1 56319C. 64512-65534D. 64513-65535E. There are no defined private AS numbers; there are only private IP addresses.



Explanation:

QUESTION 97Which of the following statements regarding Internet Exchange Points is FALSE?

A. They provide both peering and transit services.B. They provide services only to Tier 1 service providers.C. They can be either public or private.D. They provide services at the local, regional and continental levels.




Assume all router-IDs are properly configured, and IPv6 link-local addresses are used to establish all eBGP sessions. Given the following iBGP configuration onrouter A, what is the Next Hop for prefix 2001:DB8:A:401::1/128 on router B?

A. The IPv6 link-local address of the router D interface towards router A.B. The IPv6 link-local address of the router A interface towards router D.C. The IPv6 global address of router A.D. The IPv6 global address of router D.



QUESTION 99Which regular expression will match the AS Path of a route originating in remote AS 65100?


A. ".+ 65100"B. "65100.+"

C. ".* 65100.*"D. "65100"



QUESTION 100Which of the following statements regarding route reflectors is TRUE?

A. Route reflectors propagate BGP learned routes to their clients.B. Route reflectors require "n" iBGP sessions, where "n" is the number of BGP routers in the AS.C. Route reflectors disable iBGP split horizon for all iBGP peers in the AS.D. Route reflectors do not work in conjunction with confederations.




Router R1 is a route reflector with clients R2, R5 and R6. Prefixes advertised by router R5 have a local preference of 200. Router R3 advertises the prefix192.168.1.0/27 to routers R5 and R6. Assuming that none of the routers in AS 65540 is configured with "advertise-external", what is the expected output of "showrouter bgp routes on router R1?




QUESTION 102Which of the following about default BGP behavior is FALSE?

A. Next Hop is modified in iBGP updates.B. Origin Code is NOT modified in eBGP updates.C. AS Path is modified in eBGP updates.D. Local Preference is NOT modified in iBGP updates.


Explanation/Reference:explained answer.

QUESTION 103Why is a full mesh of iBGP peers required?

A. To ensure proper route propagation inside a transit AS.B. To ensure that all routers are directly connected.C. To ensure that all routers run iBGP inside a transit AS.D. To maximize control plane scalability.




Assume all router-IDs are properly configured. Which of the following configurations is required on the Alcatel-Lucent 7750 SR router A to establish an IPv6 BGPsession to router D?




QUESTION 105Consider two Alcatel-Lucent 7750 SRs in AS 65540. Router R1 has system address 10.10.10.1, and router R2 has system address 10.10.10.2. Which of thefollowing configurations on router R2 can establish a BGP session with router R1?




QUESTION 106A router in AS 65100 receives three routes for 138.120.0.0/16. The first route has an AS Path of 65200 65400 65300 and a local preference of 150. The secondroute has an AS Path of 65200 65300 and a local preference of 100. The third route has an AS path of 65600 65300 and a local preference of 200.Which route will appear in the RIB-In?

A. Only the first route will appear in the RIB-In.B. Only the second route will appear in the RIB-In.C. Only the third route will appear in the RIB-In.D. All routes will appear in the RIB-In.


Explanation/Reference:exact.

QUESTION 107What kind of BGP attribute is the Local Preference?

A. Optional transitive attribute.B. Optional non-transitive attribute.C. Well-known mandatory attribute.D. Well-known discretionary attribute.

Correct Answer: D



QUESTION 108Which of the following is TRUE?

A. There can only be one community associated with a route.B. Community is an optional non-transitive attribute.C. Community is an optional transitive attribute.D. Community is a well-known discretionary attribute.




Assuming a full iBGP mesh in ISP 1, how does router R1 in ISP 1 handle a BGP update received from ISP 2?

A. The update is sent to router R2 in ISP 1.B. The update is sent to routers R2 and R3 in ISP 1.C. The update is sent to all routers in ISP 1.D. The update is sent to routers R2 and R3 in ISP 1, and to router R3 in ISP 2.



QUESTION 110The user of an Alcatel-Lucent 7750 SR wants to see the effect of changing an import policy immediately. What is the best command to force re-evaluation of theimport policy with minimal impact?

A. Configure router bgp shutdownB. Clear router bgp neighbor <ip-address> softC. Clear router bgp neighbor <ip-address> soft-inboundD. Clear router bgp protocol




Assume all router-IDs are properly configured, and link-local IPv6 addresses are used to establish the eBGP sessions. Which of the following is the MINIMALconfiguration required on router A so that router B can exchange traffic with router D?




QUESTION 112A BGP router has loopback interfaces 192.168.1.1/27 and 192.168.2.1/27 advertised into BGP using the following export policy. The "aggregate 192.168.0.0/16"command is executed. What is the effect of this configuration?

A. A single route for 192.168.0.0/16 is advertised.B. BGP routes 192.168.1.0/27, 192.168.2.0/27, and 192.168.0.0/16 are advertised.C. BGP routes 192.168.1.0/27 and 192.168.2.0/27 are advertised, and 192.168.0.0/16 appears asa "Blackhole" route in the route table only.D. The given export policy is invalid.



QUESTION 113The following policies are configured and exported using "export "Policy-1" "Policy-2"". Assuming both "Client-1" and "Client-2" are properly defined on the router,which routes are advertised?

A. Client-1 routes only.B. Client-2 routes only.C. Client-1 and Client-2 routes.

D. Neither Client-1 nor Client-2 routes.





AS 65550 owns the CIDR block 10.64.0.0/12. Router R4 advertises the aggregate 10.64.0.0/12 to AS65540. Which of the following is TRUE regarding theaggregate route advertisement?

A. The aggregator attribute will not be present, and the atomic aggregate flag will not be set.B. The aggregator attribute will not be present, and the atomic aggregate flag will be set.C. The aggregator attribute will be present, and the atomic aggregate flag will not be set.D. The aggregator attribute will be present, and the atomic aggregate flag will be set.




Router R1 is advertising prefix 192.168.1.0/27 with community "no-export. Which routers will receive an update for that prefix?

A. Router R2 only.B. Routers R2 and R3 only.C. Routers R2, R3 and R4 only.D. Routers R2, R3, R4and R5.




A. Only entry 10 is executed for "client1" and "client2".B. Entries 10 and 20 are executed for "client1", and entries 10 and 30 are executed for "client2".C. Entries 10 and 20 are executed for "client1", and entries 10, 20 and 30 are executed for"client2".D. Entry 10 is executed for directly-connected routes, entry 20 for "client1" and entry 30 for "client2".



QUESTION 117Which of the following statements regarding BGP shortcuts is FALSE?

A. MPLS tunnels are used to carry transit traffic across the network.B. A full mesh of iBGP peering sessions is not required,C. Edge and transit routers need to be configured with BGP.D. The transit routers need to support LDP or RSVP-TE LSPs.




Assuming the network is IPv6 only, which of the following configurations on the Alcatel-Lucent 7750 SR router A can establish an IPv6 BGP session to router B?

A. Option A

B. Option BC. Option CD. Option D




Routers RR1 and RR2 are route reflectors with the same Cluster-ID. How does router RA treat the updates for prefix 192.168.1.0/27 received from routers RR1and RR2?

A. Router RA prefers the update received from router RR1.B. Router RA prefers the update received from router RR2.C. Router RA flags both updates as invalid.D. Router RA accepts both updates and flags them as used.



QUESTION 120An autonomous system has 7 routers configured with BGP. How many iBGP sessions are required for a fully meshed configuration?

A. 7B. 13C. 21D. 42


Explanation/Reference:well defined.


An update travels from AS 137000 to AS 135000, traversing both 32-bit and 16-bit AS Paths.

What AS Path is seen by AS 200?

A. 140000 137000B. 137000 140000C. 23456 23456D. 200 140000 137000




Assume all router-IDs are properly configured, and global IPv6 addresses are used to establish eBGP sessions. Which of the following configurations is requiredon router A so that router B can exchange traffic with router D?

A. Option A

B. Option BC. Option CD. Option D




Which of the following is a valid BGP configuration for router R2?





Routers C and E are route reflectors. When the update for prefix 192.168.2.0/24 is received at router F, what will be the Originator_ID attribute?

A. The router ID of router A.B. The router ID of router B.C. The router ID of router C.D. It will not be set.




Routers RR1 are RR2 are redundant route reflectors for clients R3 and R4. Which of the following is a valid configuration on router R3?

A. Option AB. Option B

C. Option CD. Option D



QUESTION 126Which of the following is considered a best practice for BGP address planning?

A. Advertising external networks into IGP.B. Using system addresses for setting up iBGP sessions.C. Exporting the networks associated with the external links of eBGP peers into BGP.D. Optimizing BGP route table by exporting IGP routes into BGP.




AS 65100 is advertising 192.168.1.0/27 into BGP. Which of the following AS Paths would the prefix 192.168.1.0/27 contain when viewed on router R7?

A. 65206 65202 65100B. (65206 65202)65100C. (65204 65206 65202) 65100D. (65200) 65100


Explanation/Reference:well explained answer.

QUESTION 128Which of the following is NOT considered an option of import policies?

A. Preventing unwanted NLRI from entering the AS.B. Filtering NLRI based on AS Path or prefix-lists,C. Modifying the local preference of route advertisements.

D. Setting MED values of route advertisements.


Explanation/Reference:agreed with the answer.

QUESTION 129Which of the following AS Paths will match the regular expression "65100."?

A. "65100"B. "65100 65200''C. "65200 65100"D. "65100 65250 65200"


Explanation/Reference:appropriate answer.


A. "client2" routes will be only tagged with communities 'East'' and "South".B. "client2" routes will be tagged with community "East".C. "client2" routes will only be tagged with community "South".

D. "client2" routes will be rejected.




Which of the following can be used by router R4 in AS 65542 to reject all routes originating in AS 65540?

A. An import policy that rejects updates with an AS Path matching the regular expression ".+65540 .+".B. An import policy that rejects updates with an AS Path matching the regular expression ".+65540".C. An import policy that rejects updates with an AS Path matching the regular expression "65540.+".D. An import policy that rejects updates with an AS Path matching the regular expression "65540".



QUESTION 132When implementing a BGP policy on an Alcatel-Lucent 7750 SR, which of the following types of address space would a typical address plan need to cover?

A. RIR assigned CIDR space.B. External client address space.C. Loopback or link addresses.D. External link addresses.E. All of the above.

Correct Answer: ESection: (none)Explanation

Explanation/Reference:true answer.

QUESTION 133Which of the following statements regarding the Originator_ID attribute is TRUE?

A. The BGP router that originates an update sets the Originator_ID.B. The Originator_IDis set to the ClusterJD of the advertising router reflector.C. Both confederation and route reflector topologies use the Originator_ID.D. A BGP router ignores an update that contains its own BGP router ID as Originator_ID.




Routers RR1 and RR2 are route reflectors with the same cluster-ID. How many updates for prefix 192.168.1.0/27 are received at router RR1?

A. 1B. 2C. 3D. 4



QUESTION 135Which of the following behaviors regarding the modification of BGP attributes within a confederation is TRUE?

A. Next Hop is modified when crossing member AS boundaries within a confederation.B. Origin Code is modified when crossing member AS boundaries within a confederation.C. AS Path is modified when crossing member AS boundaries within a confederation.D. None of the well known mandatory attributes is modified within a confederation.

Certkiller.4A0-102 {135q} - GRATIS EXAM

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