Nov-03 ©Cisco Systems CCNA Semester 1 Version 3 Comp11 Mod9 – St. Lawrence College – Cornwall Campus, ON, Canada – Clark slide 1

Cisco Systems CCNA Version 3 Semester 1

Module 9

Nov-03 ©Cisco Systems CCNA Semester 1 Version 3 Comp11 Mod9 – St. Lawrence College – Cornwall Campus, ON, Canada – Clark slide 2

Students completing this module should be able to:

• Explain why the Internet was developed and how TCP/IP fits the design of the Internet.

• List the four layers of the TCP/IP model. • Describe the functions of each layer of the TCP/IP model. • Compare the OSI model and the TCP/IP model. • Describe the function and structure of IP addresses. • Understand why subnetting is necessary. • Explain the difference between public and private addressing. • Understand the function of reserved IP addresses. • Explain the use of static and dynamic addressing for a device. • Understand how dynamic addressing can be done using RARP, BootP

and DHCP. • Use ARP to obtain the MAC address to send a packet to another

device. • Understand the issues related to addressing between networks.

Nov-03 ©Cisco Systems CCNA Semester 1 Version 3 Comp11 Mod9 – St. Lawrence College – Cornwall Campus, ON, Canada – Clark slide 3

Module Overview9.1 Introduction to TCP/IP

9.1.1 History and future of TCP/IP 9.1.2 Application layer 9.1.3 Transport layer 9.1.4 Internet layer 9.1.5 Network access layer 9.1.6 Comparing the OSI model and the TCP/IP model 9.1.7 Internet architecture

9.2 Internet Addresses9.2.1 IP addressing 9.2.2 Decimal and binary conversion 9.2.3 IPv4 addressing 9.2.4 Class A, B, C, D, and E IP addresses 9.2.5 Reserved IP addresses 9.2.6 Public and private IP addresses 9.2.7 Introduction to subnetting 9.2.8 IPv4 versus IPv6

9.3 Obtaining an IP Address9.3.1 Obtaining an Internet address 9.3.2 Static assignment of an IP address 9.3.3 RARP IP address assignment 9.3.4 BOOTP IP address assignment 9.3.5 DHCP IP address management 9.3.6 Problems in address resolution 9.3.7 Address Resolution Protocol (ARP)

Nov-03 ©Cisco Systems CCNA Semester 1 Version 3 Comp11 Mod9 – St. Lawrence College – Cornwall Campus, ON, Canada – Clark slide 4

Overview

Nov-03 ©Cisco Systems CCNA Semester 1 Version 3 Comp11 Mod9 – St. Lawrence College – Cornwall Campus, ON, Canada – Clark slide 5

9.1.1 History and future of TCP/IP

The Department of Defense (DoD) developed the TCP/IP reference model to provide a communication network that could continue to function in wartime.

Nov-03 ©Cisco Systems CCNA Semester 1 Version 3 Comp11 Mod9 – St. Lawrence College – Cornwall Campus, ON, Canada – Clark slide 6

9.1.6 Comparing the OSI model and the TCP/IP model

Both have an application layer. Both have similar transport and network layers.

Both assume packet-switched networks.

Nov-03 ©Cisco Systems CCNA Semester 1 Version 3 Comp11 Mod9 – St. Lawrence College – Cornwall Campus, ON, Canada – Clark slide 7

9.1.2 Application layer

OSI layers 5, 6 & 7 are all rolled into the TCP Application Layer.

Encoding

Dialog Control

Data Presentation

Nov-03 ©Cisco Systems CCNA Semester 1 Version 3 Comp11 Mod9 – St. Lawrence College – Cornwall Campus, ON, Canada – Clark slide 8

1. File Transfer Protocol (FTP)• FTP is a reliable, connection-oriented service that uses TCP to transfer files

between systems that support FTP. • It supports bi-directional binary file and ASCII file transfers.

2. Trivial File Transfer Protocol (TFTP)• TFTP is a connectionless service that uses the User Datagram Protocol (UDP). • TFTP is used on the router to transfer configuration files and Cisco IOS

images, and to transfer files between systems that support TFTP. • It is useful in some LANs because it operates faster than FTP in a stable

environment. 3. Network File System (NFS)

• NFS is a distributed file system protocol suite developed by Sun Microsystems that allows file access to a remote storage device such as a hard disk across a network.

4. Simple Mail Transfer Protocol (SMTP)• SMTP administers the transmission of e-mail over computer networks. • It does not provide support for transmission of data other than plaintext.

5. Terminal emulation (Telnet)• Telnet provides the capability to remotely access another computer. • It enables a user to log in to an Internet host and execute commands. • A Telnet client is referred to as a local host. • A Telnet server is referred to as a remote host.

6. Simple Network Management Protocol (SNMP)• SNMP is a protocol that provides a way to monitor and control network devices,

and to manage configurations, statistics collection, performance, and security. 7. Domain Name System (DNS)

• DNS is a system used on the Internet for translating names of domains and their publicly advertised network nodes into IP addresses.

Nov-03 ©Cisco Systems CCNA Semester 1 Version 3 Comp11 Mod9 – St. Lawrence College – Cornwall Campus, ON, Canada – Clark slide 9

9.1.3 Transport layer

There are only two protocols at the transport layer, TCP and UDP.

Nov-03 ©Cisco Systems CCNA Semester 1 Version 3 Comp11 Mod9 – St. Lawrence College – Cornwall Campus, ON, Canada – Clark slide 10

9.1.3 Transport layer

TCP is responsible for:• end-to-end communication • flow control • reliability of data delivery

Note: The first line is not sent. The second line is the ACK line.

TCP supports a logical connection between the sending and receiving hosts