單項選擇題

As an experienced network engineer, you are asked to troubleshoot a CIS network outage. During the troubleshooting process, you notice that one of your colleagues connects additional devices to the network with the use of his own switch. With the purpose of improving speed, the switch is attached to both network ports in an office, which leads to bridge loop.
Enabling which of the following feature will be able to prevent this problem from happening again?()

A.GLBP
B.RSTP
C.BPDU guard
D.root guard


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A. Disables the interfaces to prevent traffic flow
B. Clears all the configurations on the interface
C. Switches the port from access mode to trunk mode
D. Converts the port from physical Layer 2 port to physical Layer 3 port

4.單項選擇題What is the most likely reason that an IBGP route that has been selected as a best route is not entered into the IP routing table?()

A. Route reflectors are not passing updates properly.
B. BGP synchronization has been enabled.
C. The next-hop address is unreachable.
D. No loopback interface has been configured on a router.

5.單項選擇題Which Cisco IOS command is used to troubleshoot a problem in which a BGP session stays in the active state?()

A. debug ip bgp updates
B. debug ip tcp events
C. debug ip bgp transactions
D. debug ip tcp transactions

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What is the function of the no switchport catalyst switch interface configuration command?()

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