2. 从业资格
  3. Typically, an IP address refers to an in

Typically, an IP address refers to an in

免费题库2022-08-02  72
问题 Typically, an IP address refers to an individual host on a particular network. IP also accommodates addresses that refer to a group of hosts on one or more networks. Such addresses  are referred to as multicast addresses, and the act of sending a packet from a source to the members of a （1）group is referred to as multicasting. Multicasting done （2）the scope of a single LAN segment is straightforward. IEEE 802 and other LAN protocols include provision for MAC-level multicast addresses. A packet with a multicast address is transmitted on a LAN Segment. Those stations that are members of the （3）multicast group recognize the multicast address and （4）the packet. In this case, only a single copy of the packet is ever transmitted. This technique works because of the （5）nature of a LAN: A transmission from any one station is received by all other station on the LAN.空白（4）应选（    ）。A. RejectB. acceptC. discard D. transmit
选项 A. Reject
B. accept
C. discard
D. transmit
答案 B
解析 一般来说，一个IP地址对应网络上的一台主机。IP地址还能标识一组或多个网络上的主机组的地址，这种地址叫IP组播地址，把数据源发出的数据包传送给相应组播组成员的过程叫组播。组播在单一局域网段是直接传送的，使用IEEE802以及一些局域网协议如物理层协议。当包含一个组播地址的数据包在局域网段传输时，属于接收数据的组播组中的工作站能够识别这个地址并接收数据包。采用这种方式只需传送一份数据包副本，这是因为局域网是广播通信这个性质：即由一个工作站发出的数据可以被同一局域网内的所有工作站接收。
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软件水平考试初中高级

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