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| 作者：不明 来源：www.pccode.net 整理 发布时间：2007-1-24 15:24:30 发布人：wongrs | |
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76. [xINx] In a TCP acknowledgment, the ack number refers to: (Choose one.) a) A sequential number beginning with 1, and incremented by 1 with each exchange, that identifies this exchange of packets as being complete b) The number of the packet expected next c) The number of the packet expected next, plus 1 d) A number agreed upon at session establishment, which will be used by the receiver to indicate a successful exchange of packets e) TCP does not use acknowledgments. Answer b) The number of the packet expected next This number is the previous Sequence number +1. Check out the sequence and the acknowledgement numbers below: Reference the diagram and configurations below for Questions 77 and 78: Router_C#sh run Building configuration... Current configuration: ! version 11.2 ! hostname Router_C ! ! appletalk routing ipx routing 0060.09c3.df60 ! interface Ethernet0 ip address 172.16.1.1 255.255.255.0 appletalk cable-range 100-105 103.243 appletalk zone right ipx network DAD ! interface Ethernet1 no ip address shutdown ! interface Serial0 ip unnumbered Ethernet0 appletalk cable-range 120-120 120.17 appletalk zone left ipx network AD clockrate 56000 ! interface Serial1 no ip address shutdown ! router igrp 100 network 172.16.0.0 ! no ip classless !! line con 0 line aux 0 line vty 0 4 login ! end Router_B#sh run Building configuration... Current configuration: ! version 11.3 no service password-encryption ! hostname Router_B ! ! appletalk routing ipx routing 0007.7816.fe54 ! interface Loopback0 ip address 172.17.1.1 255.255.255.0 ! interface Serial0 ip unnumbered Loopback0 no ip mroute-cache appletalk cable-range 130-130 130.81 appletalk zone right ipx network CAD no fair-queue ! interface Serial1 ip unnumbered Loopback0 appletalk cable-range 120-120 120.125 appletalk zone left ipx network AD ! interface Serial2 no ip addr
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