2017下半年系統(tǒng)規(guī)劃與管理師上午真題試題解析第71-75題
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
信管網(wǎng)解析：
通常，IP地址是指特定網(wǎng)絡(luò)上的單個(gè)主機(jī)。IP還容納地址，指的是一組或多個(gè)網(wǎng)絡(luò)上的主機(jī)組。這樣的地址被稱為多播地址，從一個(gè)源發(fā)送一個(gè)包到一個(gè)（1）組的成員的行為稱為多播。完成多播（2）單個(gè)局域網(wǎng)段的范圍很簡(jiǎn)單。IEEE 802和其他局域網(wǎng)協(xié)議包括提供MAC級(jí)多播地址。在局域網(wǎng)部分發(fā)送具有多播地址的包。作為（3）組播組成員的那些站識(shí)別組播地址和（4）分組。在這種情況下，傳輸包只有一個(gè)副本。這種技術(shù)之所以能起作用，是因?yàn)榫钟蚓W(wǎng)的（5）性質(zhì)：來(lái)自任何一個(gè)站的傳輸都是由局域網(wǎng)上所有其他站接收的。
（1）A、很多的
B、只有
C、單一的
D、組播
（2）A、在內(nèi)部
B、由于
C、超過(guò)
D、蓋
（3）A、不同的
B、獨(dú)特的
C、特殊的
D、相應(yīng)的
（4）A、拒絕
B、接受
C、丟棄
D、傳輸
（5）A、組播
B、單播
C、廣播
D、多個(gè)單播
信管網(wǎng)參考答案：D、A、C、B、C
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