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