With circuit switching,a(1)path is established between two stations for communication.Switching and transmission resources within the networkare(2)for the exclusive use of the circuit for the duration of the connection.The connection is(3)：Once it is established，it appears to attached devices as if there were a direct connection.Packet switching was designed to provide a more efficient facility than circuit switching for(4)data traffic.Each packet contains some portion of the user data plus control information needed for proper functioning of the network.A key distinguishing element of packet-switching networks is whether the internal operation is datagram or virtual circuit.With internal virtual circuits,a route is defined between two endpoints and all packets for that virtual circuit follow the(5)route,With internal datagrams,each packet is treated independently,and packets intended for the same destination may follow different routes.

（1）A.unique

B.dedicated

C.nondedicated

D.independent

（2）A.discarded

B.abandoned

C.reserved

D.broken

（3）A.indistinct

B.direct

C.indirect

D.transparent

（4）A.casual

B.bursty

C.limited

D.abundant

（5）A.same

B.different

C.single

D.multiple

信管网参考答案：B、C、D、B、A

查看解析：www.cnitpm.com/st/4034512931.html

相关推荐：

点击查看/下载：网络工程师历年真题汇总

点击查看：网络工程师在线培训课程 丨 免费试听课程

免费练习：网络工程师考试题库(模拟试题、章节练习、每日一练)