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2017下半年系统规划与管理师上午真题试题解析第71-75题
71-75、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.
（1）A.numerous
B.only
C.single
D.multicast
（2）A.within
B.out of
C.beyond
D.cover
（3）A.different
B.unique
C.special
D.corresponding
（4）A.reject
B.accept
C.discard
D.transmit
（5）A.multicast
B.unicast
C.broadcast
D.multiple unicast
信管网解析：
通常，IP地址是指特定网络上的单个主机。IP还容纳地址，指的是一组或多个网络上的主机组。这样的地址被称为多播地址，从一个源发送一个包到一个（1）组的成员的行为称为多播。完成多播（2）单个局域网段的范围很简单。IEEE 802和其他局域网协议包括提供MAC级多播地址。在局域网部分发送具有多播地址的包。作为（3）组播组成员的那些站识别组播地址和（4）分组。在这种情况下，传输包只有一个副本。这种技术之所以能起作用，是因为局域网的（5）性质：来自任何一个站的传输都是由局域网上所有其他站接收的。
（1）A、很多的
B、只有
C、单一的
D、组播
（2）A、在内部
B、由于
C、超过
D、盖
（3）A、不同的
B、独特的
C、特殊的
D、相应的
（4）A、拒绝
B、接受
C、丢弃
D、传输
（5）A、组播
B、单播
C、广播
D、多个单播
信管网参考答案：D、A、C、B、C
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