CCNA: Cisco Certified Network Associate — Question 806

Which QoS forwarding per-hop behavior changes a specific value in a packet header to set the class of service for the packet?

Answer options

• A. shaping
• B. classification
• C. policing
• D. marking

Correct answer: D

Explanation

The correct answer is D, marking, as it specifically refers to the process of changing a value in the packet header to establish the packet's class of service. Shaping (A) deals with controlling the rate of traffic, classification (B) involves categorizing traffic but does not modify headers, and policing (C) pertains to monitoring and enforcing traffic rates without changing packet headers.