单项选择题
The OSPF RFC 3623 Graceful Restart feature allows you to configure IETF NSF in ultivendor networks. When using OSPF Graceful Restart，which mechanism is used tocontinue forwarding packets during a switchover？（）
A.Reverse Path Forwarding
B.Hardware-based forwarding
C.UDP forwarding
D.Layer 2 Forwarding
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AAAauthenticationlogin做什么用？ -
单项选择题
Whatkeywordsdoyouneedtotheaccess-listtoprovidetotheloggingmessagelikesourceaddressandsourcemacaddress？（）
A.Log
B.Log-input
C.Log-output
D.Logging -
单项选择题
Whiledeployinganewswitch，youaccidentlyconnectports3/12and3/18together，creatingaloop.STPdetecteditandplacedport3/18inblockingmode.WhydidSTPnotplaceport3/12inblockingmodeinstead？（）
A.Port 3/12 was already up and forwarding before the loop was created.
B.Port priority is based on lowest priority and lowest port number.
C.You connected the wire on port 3/18 last.
D.None of the above， it is purely random.
