单项选择题
A.show ip protocols
B.show running-config
C.show ip ospf neighbor
D.show ip ospf border-routers
单项选择题 WhichcommandshouldyouusetoverifywhatnetworksarebeingroutedbyagivenOSPFprocess？（）
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？（）