Cisco Systems CCNA 2 manual Module 8 TCP/IP Suite Error and Control Messages, Module 8 Caution

Module 8: TCP/IP Suite Error and Control Messages

Overview

The main goal of Module 8 is for students to learn how the IP protocol uses the ICMP protocol to provide control messages to hosts on a network. IP does not have the facilities to send error messages. It uses ICMP to send, receive, and process error and control messages.

Module 8 Caution

Error and control messaging is an important aspect of TCP/IP. Make sure the students understand that ICMP is the protocol that handles these functions for the TCP/IP suite. If time is an issue, this module can be used as a reference for other modules when students encounter different ICMP error messages in their labs and in their use of programs such as browsers and e-mail.

Students who complete this module should be able to perform the following tasks:

•Describe ICMP

•Describe the ICMP message format

•Identify ICMP error message types

•Identify potential causes of specific ICMP error messages

•Describe ICMP control messages

•Identify a variety of ICMP control messages that are used in networks

•Determine the causes for ICMP control messages

93 - 238 CCNA 2: Routers and Routing Basics v3.1 Instructor Guide – Module 8 Copyright ♥ 2004, Cisco Systems, Inc.