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單項選擇題X.25使用映射的作用是（）。

A.映射本地IP到對端端口值，以便路由器發(fā)送數(shù)據(jù)時確認(rèn)發(fā)送端口
B.映射本地IP到本地端口值，以便路由器發(fā)送數(shù)據(jù)時確認(rèn)發(fā)送端口
C.映射對端IP到本地端口值，以便X.25交換網(wǎng)絡(luò)查找數(shù)據(jù)發(fā)送路徑
D.映射對端IP到對端端口值，以便X.25交換網(wǎng)絡(luò)查找數(shù)據(jù)發(fā)送路徑

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2.多項選擇題一個子網(wǎng)掩碼為255.255.240.0的網(wǎng)絡(luò)中，（）為合法網(wǎng)段地址。

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3.多項選擇題All of the routers in the network are configured with the ip subnet-zero command. Which network addresses should be used for Link A and Network A (Choose two.)（）。

A.Network A - 172.16.3.48/26
B.Network A - 172.16.3.128/25
C.Network A - 172.16.3.192/26
D.Link A - 172.16.3.0/30
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F.Link A - 172.16.3.112/30

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4.多項選擇題 The switches shown in the diagram, Core and Core2, are both Catalyst 2950s. The addressing scheme for each company site is as follows:Router Ethernet port - 1st usable addressCore - 2nd usable addressCore2 - 3rd usable addressFor this network, which of the following commands must be configured on Core2 to allow it to be managed remotely from any subnet on the network? （）

A.Core2(config)# interface f0/0 Core2(config-if)# ip address 192.168.1.10 255.255.255.248
B.Core2(config)# interface vlan 1 Core2(config-if)# ip address 192.168.1.11 255.255.255.248
C.Core2(config)# line con 0 Core2(config-line)# password cisco
D.Core2(config)# line vty 0 4 Core2(config-line)# password cisco
E.Core2(config)# ip default-gateway 192.168.1.9
F.Core2(config)# ip route 0.0.0.0 0.0.0.0 192.168.1.8

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5.單項選擇題Which type of EIGRP route entry describes a fesible successor？（）

A.a primary route，stored in the routing table
B.a backup route，stored in the routingt able
C.a backup route，stored in the topology table
D.A primary route，stored in the topology table

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