下列是一台第三层交换机的路由表信息,表中的管理距离值为缺省值,其中路由表项全部正确的是( )。

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问题 下列是一台第三层交换机的路由表信息,表中的管理距离值为缺省值,其中路由表项全部正确的是(          )。

选项 A、O 162.105.153.0/24[170/2]via 162.105.254.8,00:23:00,Vlan2
O 162.105.152.0/24[170/2]via 162.105.254.14,00:23:00,Vlan2
C 162.105.157.0/24 is directly connected.Vlan157
C 162.105.156.0/24 is directly connected,Vlan30
O E1 162.105.144.0/25 [170/30]via 162.105.253.249,00:23:00,Vlan253
O 162.105.151.0/24 [170/2] via 162.105.254.14,00:23:00,Vlan2
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
B、O 162.105.153.0/24[110/2]via 162.105.254.8,00:23:00,Vlan2
O 162.105.152.0/24[110/2]via 162.105.254.14,00:23:00,Vlan2
C 162.105.157.0/24 is directly connected.00:23:00,POS3/0
C 162.105.156.0/24 is directly connected,00:23:00,FastEthernet2/5
O E1 162.105.144.0/25 [110/30]via 162.105.253.249,00:23:00,Vlan253
O 162.105.151.0/24 [110/2] via 162.105.254.8,00:23:00,Vlan2
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
C、O 162.105.153.0/24[110/2]via 162.105.254.8,00:23:00,Vlan2
O 162.105.152.0/24[110/2]via 162.105.254.14,00:23:00,Vlan2
C 162.105.157.0/24 is directly connected,Vlan157
C 162.105.156.0/24 is directly connected,Vlan30
O E1 162.105.144.0/25 [110/30]via 162.105.253.249,00:23:00,Vlan253
O 162.105.151.0/24 [110/2] via 162.105.254.14,00:23:00,Vlan2
S 162.105.239.0/25 [1/0] via Vlan252
S 162.105.125.128/26 [1/0] via Vlan3
D、O 162.105.153.0/24[110/2]via 162.105.254.8,00:23:00,Vlan2
O 162.105.152.0/24[110/2]via 162.105.254.14,00:23:00,Vlan2
C 162.105.157.0/24 is directly connected,Vlan157
C 162.105.156.0/24 is directly connected,Vlan30
O E1 162.105.144.0/25 [110/30]via 162.105.253.249,00:23:00,Vlan253
O 162.105.151.0/24 [110/2] via 162.105.254.14,00:23:00,Vlan2
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 路由表中第一列指明路由源码,“C”表示为直连(connected),管理距离为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,管理距离为1。“0”表示OSPF协议,管理距离为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。A选项中“0 62.105.152.0/24[170/2]’’中管理距离值错误。B选项中“C 162.105.157.0/24 is directlyconnected,00:23:00,POS3/0、C 162.105.156.0/24 isdirectly connected,00:23:00,FastEthernet2/5”处“FastEthernet2/5”和“FastEthernet2/7”处错误,该位置应填入虚拟局域网号。C选项中“S 162.105.239.0/25[1/0]via Vlan252、S 162.105.125.128/26[1/0]viaVlan3”via关键字后面填具体的IP地址,而不是端口名称。故选择D选项。
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