Designing Cisco Enterprise Networks (ENSLD) — Question 106

A network engineer is redesigning a company's QoS solution. The company is currently using IP Precedence, but the engineer plans to move to DiffServ. It is important that the new solution provide backward compatibility with the current solution. Which technology should the design include?

Answer options

• A. expedited forwarding
• B. assured forwarding
• C. class selector code points
• D. default per-hop behavior

Correct answer: C

Explanation

The correct answer is C, class selector code points, as they are specifically designed to maintain compatibility between IP Precedence and DiffServ. Options A and B, expedited forwarding and assured forwarding, are types of DiffServ behaviors but do not address backward compatibility. Option D, default per-hop behavior, refers to the standard processing of packets but does not ensure compatibility with IP Precedence.