单项选择题
A.show ip ospf
B.show ip route
C.show ip protocol
D.show ip ospf database
E.None of the other alternatives apply
多项选择题 Whiletroubleshootingsomeconnectivityissues，youissuethe"showipospfdatabase"inordertoexaminethelinkstatedatabase.WhichthreeofthestatementsbelowaretrueregardingtheOSPFlinkstatedatabase？（）
单项选择题 DR （Designated Router） is for environments where many routers on the same network such asEthernet. In the following presented network， all routers are reloaded simultaneously， and DR isselected as expected. What is the CK-RTC status？（）
多项选择题 Which three of the following network features are methods used to achieve high availability（）