Implementing and Operating Cisco Collaboration Core Technologies (CLCOR) — Question 455

Which Layer 3 PHB marking is used for VoIP applications?

Answer options

• A. 0
• B. EF
• C. AF21
• D. CS1

Correct answer: B

Explanation

The correct answer is B, EF, which stands for Expedited Forwarding and is specifically designed to prioritize VoIP traffic to ensure low latency and high-quality voice transmission. Options A (0), C (AF21), and D (CS1) do not provide the same level of prioritization for voice packets, making them unsuitable for VoIP applications.