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Unformatted text preview: D 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 receives an IP datagram with the
destination address of 220.127.116.11.
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 18.104.22.168 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. file:///D|/Documents%20and%20Settings/bigini/Docu.../homenet2run/tcpip/tcp-ip-illustrated/ip_rout.htm (17 of 17) [12/09/2001 14.46.51] Chapter 10. Dynamic Routing Protocols Dynamic Routing Protocols
Our discussion in the previous chapter dealt with static routing. The routing table entries
were created by default when an interface was configured (for directly connected interfaces),
added by the route command (normally from a system bootstrap file), or created by an
ICMP redirect (usually when the wrong default was used).
This is fine if the network is small, there is a single connection point to other networks, and
there are no redundant routes (where a backup route can be used if a primary route fails). If
any of these three conditions is false, dynamic routing is normally used.
This chapter looks at the dynamic routing protocols used by routers to communicate with
each other. We concentrate on RIP, the Routing Information Protocol, a widely used protocol
that is provided with almost every TCP/IP implementation. We then look at two newer
routing protocols, OSPF and BGP. The chapter finishes with an examination of a new
routing technique, called classless interdomain routing, that is starting to be implemented
across the Internet to conserve class B network numbers. 10.2 Dynamic Routing
Dynamic routing occurs when routers talk to adjacent routers, informing each other of what
networks each router is currently connected t...
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This test prep was uploaded on 04/04/2014 for the course ECE EL5373 taught by Professor Guoyang during the Spring '12 term at NYU Poly.
- Spring '12