下列各项是一台Cisco路由器的部分路由表信息,其中路由信息完全正确的是( )。

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问题 下列各项是一台Cisco路由器的部分路由表信息,其中路由信息完全正确的是(          )。

选项 A、C 202.112.38.16 is directly connected,POS3/0
0 E1 202.112.38.72 [110/21]via 202.1 12.62.242,2w6d,GigabitEthernet4/2
S 202.112.236.0/24 [1/0]via 202.112.41.8
0 E2 202.205.255.0/24 [110/20]via 202.112.62.242,7wod,GigabitEthemet4/2
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
B 168.160.0.0/16 [200/70]via 202.112.63.254,1w0d
B 210.74.144.0/24 [200/70] via 202.112.63.254,1w0d
S * 0.0.0.0/0 [1/0]via 202.112.38.17
B、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
O E2 202.205.255.0/24 [110/20]via 202。112.62.242,7w0d,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
B 168.160.0.0/16 [200/70] via 202.112.63.254,1w0d
B 210.74.144.0/24 [200/70] via 202.112.63.254,1w0d
S * 0.0.0.0/24 [1/0] via 202.112.38.17
C、C 202.112.38.16 is directly connected.POS3/0
O E1 202.112.38.72 [110/21] via 202.112.62.242,2w6d,vlan62
S 202.112.236.0/24 [1/0]via 202.112.41.8
O E2 202.205.255.0/24 [110/20] via 202.112.62.242,7w0d,vlan255
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,vlan250
B 168.160.0.0/16 [200/70] via 202.112.63.254,1w0d
B 210.74.144.0/24 [200/70] via 202.112.63.254,1w0d
S*0.0.0.0/0 [1/0] via 202.112.38.17
D、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 202.1 12.236.0/24 [1/0] via GigabitEthernet4/6
O E2 202.205.255.0/24 [110/20] via 202.112.62.242,7w0d,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
B 168.160.0.0/16 [200/70] via 202.112.63.254,1wOd
B 210.74.144.0/24 [200/70] via 202.112.63.254,1wod
S * 0.0.0.0/0 [1/0] via 202.112.38.17

答案A

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。“0”表示OSPF协议,管理距离110,E1表示OSPF外部路由类型1,E2表示OSPF外部路由类型2,*表示缺省路由(Candidate default)选项。B选项中“0.0.0.0/24[1/0]via 202.112.38.17”默认路由的子网掩码是0.0.0.0;C选项中“0 E1 202.112.38.72 [110/21] via 202.112.62.242,2w6d,vlan62”、“0 E2 202.205.255.0/24 [110/20] via 202.112.62.242,7w0d,vlan255”同一个地址“202.112.62.242”属于不同的虚拟子网“vlan62”和“vlan255”,而同一个地址只能属于一个子网;D选项中“S 202.112.236.0/24 [1/0] via GigabitEthernet4/6”via关键字后面填具体的IP地址。因此,本题答案选择A选项。
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