CompTIA Network+ (N10-008) — Question 436

A technician monitors a switch interface and notices it is not forwarding frames on a trunked port. However, the cable and interfaces are in working order. Which of the following is MOST likely the cause of the issue?

Answer options

• A. STP policy
• B. Flow control
• C. 802.1Q configuration
• D. Frame size

Correct answer: C

Explanation

The most likely cause of the issue is related to the 802.1Q configuration, as this protocol is essential for VLAN tagging on trunked ports. If the 802.1Q is not configured correctly, frames cannot be forwarded properly. The other options, while they may affect network performance, do not specifically prevent trunked ports from forwarding frames.