第11題： 下圖所示的網絡拓撲中配置了RIP協議，且RIP協議已更新完成。
下表所示為AR2路由器上查看到的路由信息。

從查看到的路由信息可以判斷（65），造成故障的原因是（66）。
（65）A.在AR2上ping172.16.0.1丟包
B.在AR1上ping3.3.3.3丟包
C.在AR1上ping172.16.1.1丟包
D.在AR3上ping1.1.1.1丟包
（66）A.在AR1上環(huán)回地址172.16.0.1配置錯誤
B.在AR3上環(huán)回地址172.16.1.1配置錯誤
C.RIPv1不支持無類網絡
D.RIPv2不支持無類網絡
答案解析與討論：www.xomuzic.com/st/4034024587.html

第12題： 下面關于路由器的描述中，正確的是（）。
A.路由器中串口與以太口必須是成對的
B.路由器中串口與以太口的IP地址必須在同一網段
C.路由器的串口之間通常是點對點連接
D.路由器的以太口之間必須是點對點連接
答案解析與討論：www.xomuzic.com/st/403418680.html

第13題： PGP的功能中不包括（）。
A.郵件壓縮
B.發(fā)送者身份認證
C.郵件加密
D.郵件完整性認證
答案解析與討論：www.xomuzic.com/st/40342982.html

第15題： 在層次化園區(qū)網絡設計中，（）是匯聚層的功能。
A.高速數據傳輸
B.出口路由
C.廣播域的定義
D.MAC地址過濾
答案解析與討論：www.xomuzic.com/st/403445315.html

第1題： With circuit switching,a（71）path is established between two stations for communication.Switching and transmission resources within the networkare（72）for the exclusive use of the circuit for the duration of the connection.The connection is（73）：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（74）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（75）route,With internal datagrams,each packet is treated independently,and packets intended for the same destination may follow different routes.
71、A.unique
B.dedicated
C.nondedicated
D.independent
72、A.discarded
B.abandoned
C.reserved
D.broken
73、A.indistinct
B.direct
C.indirect
D.transparent
74、A.casual
B.bursty
C.limited
D.abundant
75、A.same
B.different
C.single
D.multiple
答案解析與討論：www.xomuzic.com/st/4034512931.html