Introducing Cisco Data Center Networking (DCICN) — Question 5

In an IEEE 802.3 Ethernet frame, what is the significance of the DSAP field?

Answer options

• A. The DSAP field specifies the TCP or UDP port that is associated with the transport protocol.
• B. The DSAP field is only used on United States Department of Defense networks to indicate the information classification level.
• C. The DSAP field is only used in Ethernet II frames.
• D. The DSAP field indicates the network layer protocol.

Correct answer: D

Explanation

The correct answer is D because the DSAP (Destination Service Access Point) field is used to indicate the network layer protocol that is being used in the frame. Options A, B, and C are incorrect as they misrepresent the function of the DSAP field, which does not pertain to transport layer ports, is not limited to Department of Defense networks, and is applicable to IEEE 802.3 frames, not just Ethernet II frames.