下列是一台Cisco三层交换机的部分路由表,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三层交换机的部分路由表,表中的路由信息完全正确的是(    )。

选项 A、Gateway of last resort is 162.105.1.145 to network 0.0.0.0
O 222.29.2.0/24[110/3]via 162.105.1.145,00:13:43,Vlanl
O 222.29.32.0/24[110/3]via 162.105.1.145,00:13:43,Vlanl
O*E 20.0.0.0/0[110/1]via 202.112.41.6,00:15:10,Vlanl
C 222.105.157.0/24 is directly connected,Vlanl57
C 222.105.156.0/24 is directly connected,Vlan30
S 222.105.239.0/25[1/01 via 202.112.41.6
S 222.105.125.128/26[1/0]via 202.112.7.1
B、Gateway of last resort is 162.105.1.145 to network 0.0.0.0
O 222.29.2.0/24[110/3]via 162.105.1.145,00:13:43,Vlanl
O 222.29.32.0/24[110/3]via 162.105.I.145,00:13:43,Vlanl
O*E 20.0.0.0/0[110/1]via 162.105.1.145,00:15:10,Vlanl
C 162.105.157.0/24 is directly connected,Vlanl57
C 162.105.156.0/24 is directly connected,Vlan30
S 162.105.239.0/25[1/0]via vlanl57
S 162.105.125.128/26[1/0]via vlanl
C、Gateway of last resort is 162.105.1.145 to network 0.0.0.0
O 222.29.2.0/24[115/3]vial 62.105.1.145,00:13:43,Vlanl
O 222.29.32.0/24 [115/3]via 162.105.1.145,00:13:43,Vlanl
O*E 20.0.0.0/0[115/1]via 162.105.1.145,00:15:10,Vlanl
C 162.105.157.0/24 is directly connected,GigbpsEthernet 0/1
C 162.105.156.0/24 is directly connected,GigbpsEtllemet 0/2
S 162.105.239.0/25 [1/0 ] via 202.112.41.6
S 162.105.125.128/26[1/0]via 202.112.7.1
D、Gateway of last resort is 162.105.1.145 to network 0.0.0.0
O 222.29.2.0/24[110/3]via 162.105.1.145,00:13:43,Vlanl
O 222.29.32.0/24[110/3]via 162.105.1.145,00:13:43,Vlanl
O*E 20.0.0.0/0[110/1]via 162.105.1.145,00:15:10,Vlanl
C 162.105.157.0/24 is directly connected,Vlanl57
C 162.105.156.0/24 is direetly connected,Vlan30
S 162.105.239.0/25 [1/0]via 202.112.41.6
S 162.105.125.128/26[1/0]via 202.112.7.1

答案D

解析 A选项中,根据“Gateway of last resort is 162.105.1.145 to network 0.0.0.0”知,到达0.0.0.0网络经过162.105.1.145端口,而从“0*E2 0.0.0.0/0[110/1]via 202.112.41.6,00:15:10,Vlanl”语句中却是经过202.112.41.6端口,故A选项错误。B选择中,“S 162.105.239.0/25[1/0] via vlan157、S 162.105.125.128/26[1/0]via vlanl”两行via关键字后面缺少端口号或者端口名称,故B选项错误。C选项中,字母O代表的是OSPF协议,其管理距离是110,而题目中给出的却是115,故C选项错误。
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