CCNA Data Center Question of the Week: DSAP Field

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

A. The DSAP field specifies the TCP or UDP ports of the transport protocol.
B. The DSAP field is only used by the DoD 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.

Reveal Answer

Answer: D.

In 802.3 frame types, S-SAP is an 8-bit long field that represents the logical address of the network layer entity that has created the message (network layer protocol that is sending). D-SAP is an 8-bit long field that represents the logical addresses of the network layer entity intended to receive the message (network layer protocol that is receiving). Usually they carry identical values.

 

Related Resources
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Related Course
CCNA-DC – CCNA Data Center Boot Camp

CCNA Data Center Question of the Week Series

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• CCNA Data Center Question of the Week: IEEE Protocols
• CCNA Data Center Question of the Week: Layer 3 Switching
• CCNA Data Center Question of the Week: Layer 1 of the OSI Model
• CCNA Data Center Question of the Week: DSAP Field

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