單項選擇題While you are troubleshooting network performance issues, you notice that a switch is periodically flooding all unicast traffic. Further investigation reveals that periodically the switch is also having spikes in CPU utilization, causing the MAC address table to be flushed and relearned. What is the most likely cause of this issue?()

A.a routing protocol that is flooding updates
B.a flapping port that is generating BPDUs with the TCN bit set
C.STP is not running on the switch
D.a user that is downloading the output of the show-tech command
E.a corrupted switch CAM table


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1.單項選擇題For a router connected to two ISPs for redundancy, using IPSLA and static routing, how would you configure uRPF on the uplink interface?()

A.ip verify unicast source reachable-via any
B.ip verify unicast reverse-path
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3.單項選擇題What action will a BGP route reflector take when it receives a prefix marked with the community attribute NO ADVERTISE from a client peer?()

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B.It will not advertise the prefix to EBGP peers.
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D.It will not advertise the prefix to any peers.

4.多項選擇題Which two OSPF LSA types are new in OSPF version 3? ()

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A.6to4
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