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、C 202.1 12.38.16 is directly connected.PO$3/0
    0 E1 202.1 12.38.72 [110/21]via 202.1 12.62.242,2w6d,GigabitEthernet4/2
    S 202.112.236.0/24 [1/0] via 202.112.41.8
    O E2 202.205.255.0/24 [110/20]via 202.1 12.62.242,7wOd,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
B、C 202.112.38.16 is directly connected,PO$3/0
    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 202.112.62.242,7wOd,GigabitEthernet4/2
    162.105.0.0/16 is variably subnetted.209 subnets,4 masks
    0 162.105.139.64/26[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*0.0.0.0/24 [1/0] via 202.112.38.17
C、C 202.1 12.38.16 is directly connected.POS3/0
    0 E1 202.112.38.72 [110/21] via 202.112.62.242.2w6d.vlan62
    S 202.1 12.236.0/24 [1/0] via 202.112.41.8
    O E2 202.205.255.0/24 [110/20] via 202.112.62.242,7wod,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 202.112.63.254,1wOd
    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
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 202.112.236.0/24 [1/0] via GigabitEthemet4/6
    O 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
    0 162.105.139.64/26[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。“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OSPF外部路由类型2,*表示缺省路由(Candidate default)选项。选项B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;选项C中“O E1 202.112.38.72[110/21]via 202.112.62.242,2w6d,vlan62”、“O E2 202.205.255.0/24[110/20]via 202.112.62.242,7wOd,vlan255”同一个地址“202.112.62.242”属于不同的虚拟子网“vlan62”和“vlan255”,同一个地址只能属于一个子网;选项D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。故选择A选项。
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