单项选择题

______是一种OSPF数据分组，包含在OSPF路由器之间共享的链路状态和路由选择信息。

A．LSA
B．TSA
C．Hello
D．SPF

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问答题

下面的输出是由哪个命令生成的只需指出命令，不用指出提示符。FastEthernet0 0 is up, line protocol is upInternet Address 10.10.10.1 24, Area 0Process ID 1, Router ID 223.255.255.254, Network Type BROADCAST, Cost: 1 Transmit Delay is 1 sec, State DR, Priority 1Designated Router (ID) 223.255.255.254, Interface address 10.10.10.1Backup Designated router (ID) 172.31.1.4, Interface address 10.10.10.2Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5oob-resync timeout 40Hello due in 00:00:00Supports Link-local Signaling (LLS)Cisco NSF helper support enabledIETF NSF helper support enabledIndex 3 3, flood queue length 0Next 0x0(0) 0x0(0)Last flood scan length is 1, maximum is 1Last flood scan time is 0 msec, maximum is 0 msecNeighbor Count is 1, Adjacent neighbor count is 1Adjacent with neighbor 172.31.1. Suppress hello for 0 neighbor(s)

多项选择题

下面哪三项是OSPF采用层次设计的原因

A．旨在降低路由选择开销
B．旨在提高会聚速度
C．旨在将网络不稳定性的影响限制在当前区域内
D．旨在让OSPF配置起来更容易

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