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Internetworking with TCP/IP: Pearson New International Edition

Douglas E. Comer

Chapter 9

Internet Protocol: Error And Control Messages (ICMP) - all with Video Answers

Educators

Chapter Questions

Problem 1

Devise an experiment to record how many of each ICMP message type arrive at your host during a day.

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Problem 2

Examine the ping application on your computer. Try using ping with an IPv4 network broadcast address or an IPv 6 All Nodes address. How many computers answer? Read the protocol documents to determine whether answering a broadcast request is required, recommended, not recommended, or prohibited.

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Problem 3

Explain how a traceroute application can use ICMP.

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Problem 4

Should a router give ICMP messages priority over normal traffic? Why or why not?

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Problem 5

Consider an Ethernet that has one conventional host, $H$, and 12 routers connected to it. Find a single (slightly illegal) frame carrying an IP packet that when sent by host $H$ causes $H$ to receive exactly 24 packets.

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Problem 6

There is no ICMP message that allows a machine to inform the source that transmission errors are causing datagrams to arrive with an incorrect checksum. Explain why.

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Problem 7

In the previous question, under what circumstances might such a message be useful?

Zach Steedman
Zach Steedman
Numerade Educator

Problem 8

Should ICMP error messages contain a timestamp that specifies when they are sent? Why or why not?

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Problem 9

If routers at your site participate in ICMP router discovery, find out how many addresses each router advertises on each interface.

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Problem 10

Try to reach a server on a nonexistent host on your local network. Also try to communicate with a nonexistent host on a remote network. In which case(s) do you receive an ICMP error message, and which message(s) do you receive? Why?

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