CCNA Routing and Switching (legacy) — Question 22

In which byte of an IP packet can traffic be marked?

Answer options

• A. the ToS byte
• B. the QoS byte
• C. the CoS byte
• D. the DSCP byte

Correct answer: D

Explanation

The correct answer is D, the DSCP byte, which stands for Differentiated Services Code Point and is used to classify and manage network traffic. The ToS byte, while related, is an older method that has largely been replaced by DSCP. QoS and CoS bytes refer to Quality of Service and Class of Service, respectively, but they do not specifically indicate where traffic is marked in an IP packet.