烦请讲讲这几个问题

UID: 74599

问题1.

R2#show ip route
Gateway of last resort is not set
     172.16.0.0/16 is variably subnetted, 6 subnets, 2 masks
O       172.16.1.1/32 [110/65] via 172.16.12.1, 00:03:39, Serial0/0/0  （为什么呢？）
C       172.16.2.0/24 is directly connected, Loopback0
O       172.16.3.3/32 [110/65] via 172.16.23.3, 00:00:50, Serial0/0/1    (?)
C       172.16.12.0/24 is directly connected, Serial0/0/0
C       172.16.23.0/24 is directly connected, Serial0/0/1
O       172.16.34.0/24 [110/128] via 172.16.23.3, 00:00:40, Serial0/0/1

问题2.

Routing Protocol is "ospf 110"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Router ID 172.16.2.2
  Number of areas in this router is 1. 1 normal 0 stub 0 nssa
  Maximum path: 4
  Routing for Networks:
    172.16.2.0 0.0.0.255 area 0
    172.16.12.0 0.0.0.255 area 0
    172.16.23.0 0.0.0.255 area 0
  Routing Information Sources:                  （路由信息源这部分是什么意思）
    Gateway         Distance      Last Update
    172.16.1.1           110      00:00:15
    172.16.2.2           110      00:00:06
  Distance: (default is 110)

问题3.
R4#show ip route
Gateway of last resort is not set
     172.16.0.0/16 is variably subnetted, 6 subnets, 2 masks
O       172.16.1.1/32 [110/193] via 172.16.34.3, 01:03:03, Serial0/0/0
O       172.16.2.2/32 [110/129] via 172.16.34.3, 01:03:03, Serial0/0/0
O       172.16.3.3/32 [110/65] via 172.16.34.3, 01:03:03, Serial0/0/0
O       172.16.12.0/24 [110/192] via 172.16.34.3, 01:03:03, Serial0/0/0
O       172.16.23.0/24 [110/128] via 172.16.34.3, 01:03:03, Serial0/0/0
C       172.16.34.0/24 is directly connected, Serial0/0/0

路由条目中172.16.1.1/32 [110/193] via 172.16.34.3, 01:03:03, Serial0/0/0到达172.16.1.1的度量值为什么是193呢？
cost=1+10^8/128000+10^8/128000+10^8/128000=2344啊



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