Post on 22-Feb-2023
Solved subnetting problems In IP addressingSolved subnetting problems In IP addressing
and subnetting workbookand subnetting workbook
Version 1.1Version 1.1
ByBy
Muhedin Abdullahi MohamedMuhedin Abdullahi Mohamed
muhudin99@hotmail.commuhudin99@hotmail.com
Currently a postgraduate student inCurrently a postgraduate student in
Univeristi Teknologi MalaysiaUniveristi Teknologi Malaysia
September 2009September 2009
The workbook is available at:The workbook is available at:
http://www.scribd.chttp://www.scribd.com/doc/202468om/doc/20246803/IP-Addressing-Sub-03/IP-Addressing-Sub-Netting-WorkbNetting-Workbook ook
When asked a subnetting problem, you can be presented with several pieces of When asked a subnetting problem, you can be presented with several pieces of
information information that describe the situation. Githat describe the situation. Given that informven that information, it will be up to youation, it will be up to you
to figure out the remaining pieces of information to solve the problem. In thisto figure out the remaining pieces of information to solve the problem. In this
document I will present solutions to document I will present solutions to problemproblems in s in IP addressing and subnettingIP addressing and subnetting
work book work book v1.1 which v1.1 which was producewas produced byd by Robb JonesRobb Jones. . In the In the first parfirst part of t of thethe
workbook, the types of information that you must be able to identify are asworkbook, the types of information that you must be able to identify are as
follows:follows:
Information Information required required ValueValue
Address classAddress class
Default subnet mask Default subnet mask
Custom subnet mask Custom subnet mask
Total number of subnetsTotal number of subnets
Number of usable subnetsNumber of usable subnets
Total number of host addressesTotal number of host addresses
Number of usable addressesNumber of usable addresses
Number of bits borrowedNumber of bits borrowed
Let us now commLet us now commence solving the proence solving the problems skipping thoblems skipping those that se that were alreadywere already
solved solved as examas examples in ples in the worthe workbook.kbook.
Part1Part1
Problem4Problem411::
In this problem, the following data is given :In this problem, the following data is given :
Number Number of needeof needed usable d usable subnets: subnets: 66
Number Number of of needed needed usable usable hosts: hosts: 3030
Network Address :Network Address : 210.100.56.0210.100.56.0
For this For this problem problem the solution the solution isis
Information Information required required ValueValue
Address classAddress class CC
Default subnet maskDefault subnet mask 255.255.255.0255.255.255.0
Custom subnet maskCustom subnet mask 255.255.255.224255.255.255.224
Total number of subnetsTotal number of subnets 88
Number of usable subnetsNumber of usable subnets 66
Total number of host addressesTotal number of host addresses 3232
Number of usable addressesNumber of usable addresses 3030
Number of bits borrowedNumber of bits borrowed 33
Problem5:Problem5:
In this problem, the following data is In this problem, the following data is given:given:
Number of needed usable subnets:Number of needed usable subnets: 66
11Problems 1, 2 and 3 Problems 1, 2 and 3 are solved in the work book as are solved in the work book as examples.examples.
Number of needed usable hosts:Number of needed usable hosts: 3030
Network Address:Network Address: 195.85.8.0195.85.8.0
For this problem the solution isFor this problem the solution is
Information Information required required ValueValue
Address classAddress class CC
Default subnet maskDefault subnet mask 255.255.255.0255.255.255.0
Custom subnet maskCustom subnet mask 255.255.255.224255.255.255.224
Total number of subnetsTotal number of subnets 88
Number of usable subnetsNumber of usable subnets 66
Total number of host addressesTotal number of host addresses 3232
Number of usable addressesNumber of usable addresses 3030
Number of bits borrowedNumber of bits borrowed 33
Problem6:Problem6:
In this problem, the following data is In this problem, the following data is given:given:
Number of needed usable subnets:Number of needed usable subnets: 126126
Number of needed usable hosts:Number of needed usable hosts: 131070131070
Network Address:Network Address: 118.0.0.0118.0.0.0
For this problem the solutionFor this problem the solution
Information Information required required ValueValue
Address classAddress class AA
Default subnet maskDefault subnet mask 255.0.0.0255.0.0.0
Custom subnet maskCustom subnet mask 255.254.0.0255.254.0.0
Total number of subnetsTotal number of subnets 128128
Number of usable subnetsNumber of usable subnets 126126
Total number of host addressesTotal number of host addresses 131072131072
Number of usable addressesNumber of usable addresses 131070131070
Number of bits borrowedNumber of bits borrowed 77
Problem7:Problem7:
In this problem, the following data is In this problem, the following data is given:given:
Number of needed usable subnets:Number of needed usable subnets: 20002000
Number of needed usable hosts:Number of needed usable hosts: 1515
Network Address:Network Address: 178.100.0.0178.100.0.0
For this problem the solutionFor this problem the solution
Information Information required required ValueValue
Address classAddress class BB
Default subnet maskDefault subnet mask 255.255.0.0255.255.0.0
Custom subnet maskCustom subnet mask 255.255.255.224255.255.255.224
Total number of subnetsTotal number of subnets 20482048
Number of usable subnetsNumber of usable subnets 20462046
Total number of host addressesTotal number of host addresses 3232
Number of usable addressesNumber of usable addresses 3030
Number of bits borrowedNumber of bits borrowed 1010
Problem8:Problem8:
In this problem, the following data is In this problem, the following data is given:given:
Number of needed usable subnets:Number of needed usable subnets: 11
Number of needed usable hosts:Number of needed usable hosts: 4545
Network Address:Network Address: 200.175.14.0200.175.14.0
For this problem the solutionFor this problem the solution
Information Information required required ValueValue
Address classAddress class CC
Default subnet maskDefault subnet mask 255.255.255.0255.255.255.0
Custom subnet maskCustom subnet mask 255.255.255.192255.255.255.192
Total number of subnetsTotal number of subnets 44
Number of usable subnetsNumber of usable subnets 22
Total number of host addressesTotal number of host addresses 6464
Number of usable addressesNumber of usable addresses 6262
Number of bits borrowedNumber of bits borrowed 22
Problem9:Problem9:
In this problem, the following data is In this problem, the following data is given:given:
Number of needed usable subnets:Number of needed usable subnets: 6060
Number of needed usable hosts:Number of needed usable hosts: 10001000
Network Address:Network Address: 128.77.0.0128.77.0.0
For this problem the solutionFor this problem the solution
Information Information required required ValueValue
Address classAddress class BB
Default subnet maskDefault subnet mask 255.255.0.0255.255.0.0
Custom subnet maskCustom subnet mask 255.255.252.0255.255.252.0
Total number of subnetsTotal number of subnets 6464
Number of usable subnetsNumber of usable subnets 6262
Total number of host addressesTotal number of host addresses 10241024
Number of usable addressesNumber of usable addresses 10221022
Number of bits borrowedNumber of bits borrowed 66
Problem10:Problem10:
In this problem, the following data is In this problem, the following data is given:given:
Number of needed usable hosts:Number of needed usable hosts: 6060
Network Address:Network Address: 198.100.10.0198.100.10.0
For this problem the solutionFor this problem the solution
Information Information required required ValueValue
Address classAddress class CC
Default subnet maskDefault subnet mask 255.255.255.0255.255.255.0
Custom subnet maskCustom subnet mask 255.255.255.192255.255.255.192
Total number of subnetsTotal number of subnets 44
Number of usable subnetsNumber of usable subnets 22
Total number of host addressesTotal number of host addresses 6464
Number of usable addressesNumber of usable addresses 6262
Number of bits borrowedNumber of bits borrowed 22
Problem11:Problem11:
In this problem, the following data is In this problem, the following data is given:given:
Number of needed usable subnets:Number of needed usable subnets: 250250
Network Address:Network Address: 101.0.0.0101.0.0.0
For this problem the solutionFor this problem the solution
Information Information required required ValueValue
Address classAddress class AA
Default subnet maskDefault subnet mask 255.0.0.0255.0.0.0
Custom subnet maskCustom subnet mask 255.255.0.0255.255.0.0
Total number of subnetsTotal number of subnets 256256
Number of usable subnetsNumber of usable subnets 254254
Total number of host addressesTotal number of host addresses 6553665536
Number of usable addressesNumber of usable addresses 6553465534
Number of bits borrowedNumber of bits borrowed 88
Problem12:Problem12:
In this problem, the following data is In this problem, the following data is given:given:
Number of needed usable subnets:Number of needed usable subnets: 55
Network Address:Network Address: 218.35.50.0218.35.50.0
For this problem the solutionFor this problem the solution
Information Information required required ValueValue
Address classAddress class CC
Default subnet maskDefault subnet mask 255.255.255.0255.255.255.0
Custom subnet maskCustom subnet mask 255.255.255.224255.255.255.224
Total number of subnetsTotal number of subnets 88
Number of usable subnetsNumber of usable subnets 66
Total number of host addressesTotal number of host addresses 3232
Number of usable addressesNumber of usable addresses 3030
Number of bits borrowedNumber of bits borrowed 33
Problem13:Problem13:
In this problem, the following data is In this problem, the following data is given:given:
Number of needed usable hosts:Number of needed usable hosts: 2 52 5
Network Address:Network Address: 218.35.50.0218.35.50.0
For this problem the solution is:For this problem the solution is:
Information Information required required ValueValue
Address classAddress class CC
Default subnet maskDefault subnet mask 255.255.255.0255.255.255.0
Custom subnet maskCustom subnet mask 255.255.255.224255.255.255.224
Total number of subnetsTotal number of subnets 88
Number of usable subnetsNumber of usable subnets 66
Total number of host addressesTotal number of host addresses 3232
Number of usable addressesNumber of usable addresses 3030
Number of bits borrowedNumber of bits borrowed 33
Problem14:Problem14:
In this problem, the following data is In this problem, the following data is given:given:
Number of needed usable subnets:Number of needed usable subnets: 1010
Network Address:Network Address: 172.59.0.0172.59.0.0
For this problem the solution is:For this problem the solution is:
Information Information required required ValueValue
Address classAddress class BB
Default subnet maskDefault subnet mask 255.255.0.0255.255.0.0
Custom subnet maskCustom subnet mask 255.255.240.0255.255.240.0
Total number of subnetsTotal number of subnets 1616
Number of usable subnetsNumber of usable subnets 1414
Total number of host addressesTotal number of host addresses 40964096
Number of usable addressesNumber of usable addresses 40944094
Number of bits borrowedNumber of bits borrowed 44
Problem15:Problem15:
In this problem, the following data is In this problem, the following data is given:given:
Number of needed usable hosts:Number of needed usable hosts: 5050
Network Address:Network Address: 172.59.0.0172.59.0.0
For this problem the solution is:For this problem the solution is:
Information Information required required ValueValue
Address classAddress class BB
Default subnet maskDefault subnet mask 255.255.0.0255.255.0.0
Custom subnet maskCustom subnet mask 255.255.255.192255.255.255.192
Total number of subnetsTotal number of subnets 10241024
Number of usable subnetsNumber of usable subnets 10221022
Total number of host addressesTotal number of host addresses 6464
Number of usable addressesNumber of usable addresses 6262
Number of bits borrowedNumber of bits borrowed 1010
Problem16:Problem16:
In this problem, the following data is In this problem, the following data is given:given:
Number of needed usable hosts:Number of needed usable hosts: 2929
Network Address:Network Address: 23.0.0.023.0.0.0
For this problem the solution is:For this problem the solution is: