Exercises

Exercises

9.1

Why do you think both types of ICMP redirects ” network and host ” exist?

9.2

In the routing table for svr4 shown at the beginning of Section 9.2, is a specific route to the host slip (140.252.13.65) necessary? What would change if this entry were removed from the routing table?

9.3

Consider a cable with both 4.2BSD hosts and 4.3BSD hosts. Assume the network ID is 140.1. The 4.2BSD hosts only recognize a host ID of all zero bits as the broadcast address (140.1.0.0), while the 4.3BSD hosts normally send a broadcast using a host ID of all one bits (140.1.255.255). Also, the 4.2BSD hosts by default will try to forward incoming datagrams, even if they have only a single interface.

Describe the events that happen when the 4.2BSD hosts receive an IP datagram with the destination address of 140.1.255.255.

9.4

Continue the previous exercise, assuming someone corrects this problem by adding an entry to the ARP cache on one system on the 140.1 subnet (using the arp command) saying that the IP address 140.1.255.255 has a corresponding Ethernet address of all one bits (the Ethernet broadcast). Describe what happens now .

9.5

Examine your system's routing table and describe each entry.



TCP.IP Illustrated, Volume 1. The Protocols
TCP/IP Illustrated, Vol. 1: The Protocols (Addison-Wesley Professional Computing Series)
ISBN: 0201633469
EAN: 2147483647
Year: 1993
Pages: 378

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