640-811 Interconnecting Cisco Networking Devices Practice Exams

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640-811 Interconnecting Cisco Networking Devices

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Demo Question 2.

Exhibit: Refer to the exhibit. When PC1 sends an ARP requests for the MAC address of PC1, network performance slows dramatically, and the switches detect an unusually high number of broadcast frames. What is the most likely cause of this?

A. The portfast feature is not enabled on all switch ports.
B. The PCs are in two different VLANS.
C. Spanning Tree Protocol is not running on the switches.
D. PC2 is down and is not able to respond to the request.
E. The VTP version running on the two switches do not match.

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Answer: C

Explanation: As the switches CK1 and CK2 are connected with each other via two links, spanning tree must be enabled on both switches to avoid switching loops and broadcast storms. An ARP request is a broadcast message. If Spanning tree is not running, broadcast loops will form reducing the performance of the network.

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