●For each blank，choose the best answer from the four choices and write down on the answer sheet．SMTPICMPRARPIGMP(67) -题库考试答案搜索网

●For each blank，choose the best answer from the four choices and write down on the answer sheet．SMTPICMPRARPIGMP(67)

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2022-01-13 21:12

A、4B／SB
B、CRC
C、Manchester Code
D、Huffman Code(68) A．OSPFB．RIPC．RARPD．BGP(69) A．ADSLB．ATMC．Frame. RelayD．DDN(70) A．HTTPB．URLC．HTMLD．TAG

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试题解析

【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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