●For each blank,choose the best answer from the four choices and write down on the answer
●For each blank,choose the best answer from the four choices and write down on the answer sheet.
(66) is a protocol that a host uses to inform. a router when it joins or leaves an Internet multicast group.
(67) is an error detection code that most data communication networks use.
(68) is an interior gateway protocol that uses a distance vector algorithm to propagate routing information.
(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.
(70) is an identifier of a web page.
(66) A.SMTP
B.ICMP
C.RARP
D.IGMP
(67) A.4B/SB
B.CRC
C.Manchester Code
D.Huffman Code
(68) A.OSPF
B.RIP
C.RARP
D.BGP
(69) A.ADSL
B.ATM
C.Frame. Relay
D.DDN
(70) A.HTTP
B.URL
C.HTML
D.TAG
【解析】IGMP协议是Internet组管理协议。TCP/IP协议族的一个子协议,允许Internet主机参加多播,也即是IP主机用作向相邻多目路由器报告多目组成员的协议。多目路由器是支持组播的路由器,向本地网络发送IGMP查询。主机通过发送IGMP报告来应答查询。组播路由器负责将组播包转发到所有网络中组播成员。
循环冗余校验(CRC)是一种用得最广,检错能力很强的差错检测方法。它对数据进行多项式计算,并将得到的和数附在帧的后面。接收设备也执行类似的算法。
RIP是推出时间最长的路由协议,也是最简单的路由协议。它是"路由信息协议"的缩写,主要传递路由信息(路由表)来广播路由:每隔30秒,广播一次路由表,维护相邻路由器的关系,同时根据收到的路由表计算自己的路由表。RIP运行简单,适用于小型网络,Internet上还在部分使用着RIP。
OSPF协议是"开放式最短路优先"的缩写。"开放"是针对当时某些厂家的"私有"路由协议而言,而正是因为协议开放性,才造成OSPF今天强大的生命力和广泛的用途。它通过传递链路状态(连接信息)来得到网络信息,维护一张网络有向拓扑图,利用最小生成树算法(SPF算法)得到路由表。OSPF是一种相对复杂的路由协议。
ATM是Asynchronous Time division multiplexing的缩写,译为"异步传输模式",它是以高速分组传送模式为主,综合电路传输模式优点的一种宽带传输模式。
URL是单一资源定位符,是一种用来鉴别文件和资源在WWW中地址的专用表示。
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