Frame Relay is simplified form of  (71)  ，similar in principle to  (72)  ，in which synchronous，frames of data are routed to different destinations depending on header information．Packets are routed throught one or more Virtual Circuits known as  (73)  .Most Virtual Circuits are  (74)  ，which means that the network provider sets up all DLCI connections at subscription time．  (75)  are also part of the Frame Relay specification．They privide a link that only lasts only as long as the session．

试卷相关题目

• 1(66)is a protocol that a host uses to inform a router when it joins or leaves an Internet multicast group．<br class="bogusBR">(67)is an error detection code that most data communication networks use．<br class="bogusBR">(68)is an interior gateway protocol that uses a distance vector algorithm to propagate routing information．<br class="bogusBR">(69)is a transfer mode in which all types of information are organized into fixed form cells on an asynchronous or non-periodic basis over a range of media．<br class="bogusBR">(70)is an identifier of a web page．

  A.SMTP

  B.ICMP

  C.RARP

  D.IGMP

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• 2小于  (65)  的端口号已保留与现有的服务一一对应，此数字以上的端口号可自由分配。

  A.199

  B.100

  C.1024

  D.2048

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• 3以太网交换机根据  (62)  转发数据包.访问交换机的方式有多种,配套一台新的交换机时可以  (63)  进行访问。在键入交换机命令时可使用缩写形式,在Switch#模式下,如果键入"con",则表示  (64)  。

  A.IP 地址

  B.MAC 地址

  C.LLC 地址

  D.PORT 地址

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• 4FTP协议是Internet常用的应用层协议，它通过  (59)  协议提供服务，它是基于client/Server结构通信的，作为服务器一方的进程，通过监听  (60)  端口得知有服务请求，在一次会话中，存在  (61)  个TCP连接。

  A.UDP

  B.TCP

  C.IP

  D.IPX

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• 5RMON-1(1991)和RMON-2(1995)是  (57)  标准。RMON MIB分为10组，这10组中有  (58)  组反映以太网的统计信息。

  A.远程访问

  B.远程网络监控

  C.远程登录

  D.远程控制

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