TCP IP Illustrated

2 an icmp query request can be sent with any tos and

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Unformatted text preview: server, is made easier with the different frame type field. 5.2 Each RARP server can delay for a small random time before sending a response. As a refinement, one RARP server can be designated the primary and the others as secondaries. The primary server can respond without a delay, and the secondaries with random delays. As yet another refinement, with a primary and secondaries, the secondaries can be programmed to respond only to a duplicate request received in a short time frame. This assumes that the reason for the duplicate request is that the primary is down. Chapter 6 6.1 If there were one hundred hosts on the local cable, each could try to send an ICMP port unreachable at about the same time. Many of these transmissions could lead to collisions (if an Ethernet is being used), which can render the network useless for a second or two. 6.2 It is a "should." 6.3 An ICMP error is always sent with a TOS of 0, as we indicated in Figure 3.2. An ICMP query request can be sent with any TOS, and the corresponding reply should be sent with the same TOS. 6.4 netstat -s is the common way to see the per-protocol statistics. On a SunOS 4.1.1 host (gemini) that has received 48 million IP datagrams, the ICMP statistics are: Output histogram: echo reply: 1757 destination unreachable: 700 time stamp reply: 1 Input histogram: echo reply: 211 destination unreachable: 3071 source quench: 249 routing redirect: 2789 file:///D|/Documents%20and%20Settings/bigini/Docu...homenet2run/tcpip/tcp-ip-illustrated/append_d.htm (3 of 20) [12/09/2001 14.48.03] Appendix D: Solutions to Selected Exercises echo: 1757 #10: 21 time exceeded: 56 time stamp: 1 The 21 input messages of type 10 are router solicitations that SunOS 4.1.1 doesn't support. SNMP can also be used (Figure 25.26) and some systems, such as Solaris 2.2, generate netstat -s output that uses SNMP variable names. Chapter 7 7.2 86 bytes divided by 960 bytes/sec, times 2 gives 179.2 ms. When ping is run at this speed, the prin...
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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.

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