Designing for Cisco Internetwork Solutions (DESGN, legacy) — Question 8

In an enterprise Layer 2 switched network, which protocol must be running to enable link redundancy?

Answer options

• A. CDP
• B. STP
• C. LACP
• D. PAGP B

Correct answer:

Explanation

The correct answer is STP (Spanning Tree Protocol), which is designed to prevent loops in a Layer 2 network by creating a loop-free logical topology. CDP (Cisco Discovery Protocol) is used for network device discovery, while LACP (Link Aggregation Control Protocol) and PAGP (Port Aggregation Protocol) are used for link aggregation, not specifically for redundancy.