根据下面的文字资料回答 71～75 题 connected by（ 1 ）or Hubs,which just move the bits from one network to an identical network. One layer up we find bridgas and swiehes,which operate at data link layer. They can accept （ 2 ） , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer,we have touters that can connect two netwoks. If two networks have（ 3 ）network layer,the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which cart interface between the two transport connections. Finally, in the application layer, application gateways translate message（ 4 ）. As an example,gateways between Internet e-mail and X.400 e-mail must （ 5 ）the e-mail message and change various header fields.

第6题：文中（ 1 ）处正确的答案是（ ）。

A．reapers

B．relays

C．connects

D．modems

[单选题]根据下面的文字资料回答 71～75 题 In the following essay，each blank has four choices．Choose the most suitable one from the four choices and write down in the answer sheet．A（ 1 ）is basically an end point of a communication link between two applications.Sockets that

[单选题]根据下面的文字资料回答 71～75 题 The purpose of the requirements definition phase is to produce a clear,complete，consistent，and testable（ 1 ）of the technical requirements for the software produet．D．uring the requirements definition phase，the requirements deftnifi

[单选题]根据下面的文字资料回答 71～75 题 In the following essay．each blank has four choices．Choose the best answer and write down on the answer sheet．Spread spectrum simply means that data is sent in（ 1 ）pieces over a number of the discrete frequencies available for use

[单选题]根据下面的文字资料回答 71～75 题In the following essay，each blank has fourchoices．Choose the best answer and write down on thean，swer sheet．Microwave communication uses（ 1 ）frequency radio waves that travel instraighdine sthroughthe air．Because the waves cannot（

[单选题]根据下面的文字资料回答 71～75 题 n the following essay，each blank has four choices．Choose the most suitable one from the four choices and write down in the answer sheet．Open Shortest Path First(OSPF)is a（ 1 ）routing algorithm that（ 2 ）work done on the OSI IS-IS i

[单选题]根据下面的文字资料回答 71～75 题 The Simple Network Management Protocol(SNMP)is an （ 1 ）protocol that facilitates the exchange of management information between （ 2 ）．It is part of the Transmission Control ProtocoL/Internet Protocol(TCP/IP)protocol suite. SNMP en

[单选题]根据下面的文字资料回答 71～75 题。2007年6月1日，A市李某从国外进口一批货物，经过B市海关，因货物被怀疑走私而被B市海关扣押并拟处罚款10000元。并于当日告知李某有要求举行听证的权利。根据案情回答下列题目：第 71 题 若海关最终决定对李某处以罚款，则（ ）。A．海关扣押了李某的货物，并且对李某处以罚款的行政处罚，违反了一事不二罚的原则B．李某对扣押的行政处罚不服的，必须先提起行政复议 。C．海关未告知李某对扣押货物的行为享有申请听证的权利，违反了法定程序，该行为 无效D．扣押和罚款

[单选题]根据下面的文字资料回答 72～76 题 （ 1 ）is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string．（ 2 ）is a protocol that most USENET machines nOW use it to allow news articles to propagate from one machi

[单选题]根据下面的文字资料回答 61～62 题 RMON－1(1991)和RMON－2(1995)是（ 1 ）标准。RMON MIB分为10组，这10组中有（ 2 ）组反映以太网的统计信息。第61题：文中（ 1 ）处正确的答案是（ ）。A．远程访问B．远程网络监控C．远程登录D．远程控制

[单选题]根据下面的文字资料回答 11～12 题 Socket的通信方式包括（ 1 ），（ 2 ）是最常用的套接字类型。第11题：文中（ 1 ）处正确的答案是（ ）。A．字节流套接字B．数据报套接字C．原始数据报套接字D．A、B和C