下列是一台Cisco路由器的部分路由表信息,表中的路由信息完全正确的是( )。

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问题 下列是一台Cisco路由器的部分路由表信息,表中的路由信息完全正确的是(          )。

选项 A、O E2 202.205.159.0/24[110/20]via 202.112.62.242,7w0d,GigabitEthernet4/2
O E2 202.205.158.0/24[110/20]via 202.112.62.242,7w0d,GigabitEthernet4/2
     202.38.97.0/30 is subnetted,1 subnets
S    202.38.97.196[1/0]via GigabitEthernet4/2
C    202.112.7.0/24 is directly connected,FastEthernet2/5
C    202.112.38.16 is directly connected.POS3/0
O E1 202.112.38.72[110/21]via 202.112.62.242,2w6d,GigabitEthernet4/2
S    202.112.236.0/24[1/0]via GigabitEthernet4/2
     219.243.224.0/29 is subnetted,1 subnets
C    219.243.224.168 is directly connected,FastEthernet2/2
S    202.112.236.0/24[1/0]via GigabitEthernet4/2
     162.105.0.0/16 is variably subnetted,209 subnets,4 masks
O    162.105.139.64/26[110/3]via 162.105.250.118,10:35:25,GigabitEthernet7/0
S*   0.0.0.0/0[100/0]via 202.112.38.17
B、O E2 202.205.159.0/24[110/20]via 202.112.62.242,7w0d,GigabitEthernet4/2
O E2 202.205.158.0/24[110/20]via 202.112.62.242,7w0d,GigabitEthernet4/2
     202.38.97.0/30 is subnetted,1 subnets
S    202.38.97.196[1/0]via 202.112.41.226
C    202.112.7.0/24 is directly connected,7w0d,FastEthernet2/5
C    202.112.38.16 is directly connected,7w0d,POS3/0
O E1 202.112.38.72[110/21]via 202.112.62.242,2w6d,GigabitEthernet4/2
S    202.112.236.0/24[1/0]via 202.112.41.8
     219.243.224.0/29 is subnetted,1 subnets
C    219.243.224.168 is directly connected,7w0d,FastEthernet2/2
S    202.112.236.0/24[1/0]via 202.112.41.8
     162.105.0.0/16 is variably subnetted,209 subnets,4 masks
O    162.105.139.64/26[110/3]via 162.105.250.118,10:35:25,GigabitEthernet7/0
S*   0.0.0.0/1[100/0]via 202.112.38.17
C、O E2 202.205.159.0/24[110/20]via 202.112.62.242,7w0d,GigabitEthernet4/2
O E2 202.205.158.0/24[110/20]via 202.112.62.242,7w0d,GigabitEthernet4/2
     202.38.97.0/30 is subnetted,1 subnets
S    202.38.97.196[1/0]via 202.112.41.226
C    202.112.7.0/24 is directly connected,FastEthernet2/5
C    202.112.38.16 is directly connected.POS3/0
O E1 202.112.38.72[110/21]via 202.112.62.242,2w6d,GigabitEthernet4/2
S    202.112.236.0/24[1/0]via 202.112.41.8
     219.243.224.0/29 is subnetted,1 subnets
C    219.243.224.168 is directly connected,FastEthernet2/2
S    202.112.236.0/24[1/0]via 202.112.41.8
     162.105.0.0/16 is variably subnetted,209 subnets,4 masks
O    162.105.139.64/26[110/3]via 162.105.250.118,10:35:25,GigabitEthernet7/0
S*   0.0.0.0/0[1/0]via 202.112.38.17
D、O E2 202.205.159.0/24[110/20]via 202.112.62.242,7w0d,GigabitEthernet4/2
O E2 202.205.158.0/24[110/20]via 202.112.62.242,7w0d,GigabitEthernet4/2
     202.38.97.0/30 is subnetted,1 subnets
S    202.38.97.196[1/0]via 202.112.41.226
C    202.112.7.0/24 is directly connected,7w0d,VLAN12
C    202.112.38.16 is directly connected.7w0d,VLAN13
O E1 202.112.38.72[110/21]via 202.112.62.242,2w6d,GigabitEthernet4/2
S    202.112.236.0/24[1/0]via 202.112.41.8
     219.243.224.0/29 is subnetted,1 subnets
C    219.243.224.168 is directly connected,7w0d,VLAN14
S    202.112.236.0/24[1/0]via 202.112.41.8
     162.105.0.0/16 is variably subnetted,209 subnets,4 masks
O    162.105.139.64/26[110/3]via 162.105.250.118,10:35:25,GigabitEthernet7/0
S*   0.0.0.0/0[100/0]via 202.112.38.17

答案C

解析 路由表中第一列指明路由源码,“C”表示为直连(connected),管理距离0,表示目的网络直接与路由器的端口相连。“S”表示为静态(static)路由,管理距离1。“O”表示OSPF协议,管理距离110,E1表示OSPF外部路由类型1,E2表示0SPF外部路由类型2,*表示缺省路由(candidate default)选项。选项A“202.38.97.196[1/0]via GigabitEthernet4/2”和“202.112.236.0/24 [1/0] via GigabitEthernet4/2”语句中“Via”后面应该加的是具体的IP地址;选项B和选项D语句中“S*0.0.0.0/0[100/0]via 202.112.38.17”距离值错误,应该是[1/0]。故选择C选项。
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