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單項(xiàng)選擇題

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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What keywords do you need to the access-list to provide to the logging message like source address and source mac address？（）

A.Log
B.Log-input
C.Log-output
D.Logging

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