Which IP precedence value maps to DSCP EF?

The correct answer is D. 5. The IP Precedence value of 5 maps directly to the DSCP Expedited Forwarding (EF) class, which is typically used for real-time applications like voice to ensure low latency and jitter.

Infrastructure and Quality of Service

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How the community answered

(20 responses)

B
5% (1)
C
5% (1)
D
90% (18)

Why each option

The IP Precedence value of 5 maps directly to the DSCP Expedited Forwarding (EF) class, which is typically used for real-time applications like voice to ensure low latency and jitter.

IP Precedence 0 maps to DSCP Best Effort, meaning no specific priority.

IP Precedence 1 maps to DSCP AF11 (or CS1 in some contexts), typically used for bulk data or low-priority data.

IP Precedence 3 maps to DSCP CS3 (Call-Signaling) or AF31 (Critical Data), which are for medium-high priority traffic, not the highest real-time priority of EF.

D5Correct

IP Precedence is a 3-bit field, and a value of 5 (binary 101) directly maps to the DSCP Expedited Forwarding (EF) class. EF (DSCP 46, binary 101110) is designed to provide minimal delay and jitter, primarily for voice traffic.

Concept tested: IP Precedence to DSCP mapping (EF)

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_plcshp/configuration/15-mt/qos-plcshp-15-mt-book/qos-dscp-ip.html

Topics

#QoS#IP Precedence#DSCP#Expedited Forwarding

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