Implementing Cisco IP Switched Networks (CCNP SWITCH, legacy) — Question 46

A network engineer is extending a LAN segment between two geographically separated data centers. Which enhancement to a spanning-tree design prevents unnecessary traffic from crossing the extended LAN segment?

Answer options

• A. Modify the spanning-tree priorities to dictate the traffic flow.
• B. Create a Layer 3 transit VLAN to segment the traffic between the sites.
• C. Use VTP pruning on the trunk interfaces.
• D. Configure manual trunk pruning between the two locations.

Correct answer: C

Explanation

The correct answer is C because VTP pruning reduces unnecessary broadcast traffic on trunk links by only allowing VLANs that have active devices to traverse the trunk. Options A and D do not address traffic reduction effectively, as they focus on traffic flow control rather than pruning. Option B, while it segments traffic, does not specifically prevent unnecessary traffic from crossing the extended LAN segment.