Implementing Cisco IP Switched Networks (CCNP SWITCH, legacy) — Question 138

Which technique allows specific VLANs to be strictly permitted by the administrator?

Answer options

• A. VTP pruning
• B. transparent bridging
• C. trunk allowed VLANs
• D. VLAN access-list
• E. L2P tunneling

Correct answer: C

Explanation

The correct answer, 'trunk allowed VLANs,' specifically configures which VLANs can pass through a trunk link, allowing for strict control. Other options do not offer this level of specificity: VTP pruning optimizes bandwidth but does not permit VLANs, transparent bridging connects networks at Layer 2 without VLAN control, and VLAN access-lists do not directly manage VLAN allowances on trunks.