Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) — Question 276

What is used to perform QoS packet classification?

Answer options

• A. the Type field in the Layer 2 frame
• B. the Options field in the Layer 3 header
• C. the TOS field in the Layer 3 header
• D. the Flags field in the Layer 3 header

Correct answer: C

Explanation

The TOS (Type of Service) field in the Layer 3 header is specifically designed for QoS packet classification, allowing routers to prioritize traffic. The Type field in the Layer 2 frame, Options field in the Layer 3 header, and Flags field in the Layer 3 header do not serve this purpose in the context of QoS.