Implementing and Operating Cisco Collaboration Core Technologies (CLCOR) — Question 189

Which DiffServ PHB preserves backward compatibility with any IP precedence scheme?

Answer options

• A. expedited forwarding
• B. class selector
• C. assured forwarding
• D. default

Correct answer: B

Explanation

The correct answer is B, class selector, because it is specifically designed to align with the IP precedence scheme, allowing for backward compatibility. The other options, such as expedited forwarding and assured forwarding, do not maintain this compatibility and are designed for different traffic management purposes.