CCNA: Cisco Certified Network Associate — Question 484

Which QoS per-hop behavior changes the value of the ToS field in the IPv4 packet header?

Answer options

• A. Shaping
• B. Policing
• C. Classification
• D. Marking

Correct answer: D

Explanation

The correct answer is D, Marking, because it specifically refers to the process of altering the ToS field to indicate the priority of a packet. The other options, such as Shaping, Policing, and Classification, do not involve changing the ToS field, but rather manage traffic flow or categorize packets without modifying their headers.