300-070 · Question #387
What is the decimal value of DSCP marking Expedited Forwarding?
The correct answer is B. 46. DSCP Expedited Forwarding (EF) has a standardized decimal value of 46 and is the marking applied to delay-sensitive voice RTP traffic.
Question
What is the decimal value of DSCP marking Expedited Forwarding?
Options
- A41
- B46
- C34
- D48
How the community answered
(42 responses)- B93% (39)
- C5% (2)
- D2% (1)
Why each option
DSCP Expedited Forwarding (EF) has a standardized decimal value of 46 and is the marking applied to delay-sensitive voice RTP traffic.
Decimal 41 (binary 101001) does not correspond to any defined IETF DSCP per-hop behavior and is not used in standard QoS deployments.
DSCP EF is defined in RFC 3246 with a 6-bit binary codepoint of 101110, which equals decimal 46. It provides the low-latency, low-jitter, low-loss per-hop behavior required for voice bearer streams and is the universal marking for RTP audio traffic.
Decimal 34 corresponds to DSCP AF41 (binary 100010), which marks interactive video traffic, not Expedited Forwarding.
Decimal 48 corresponds to DSCP CS6 (binary 110000), which is reserved for network control traffic such as routing protocol packets.
Concept tested: DSCP Expedited Forwarding decimal value
Source: https://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-packet-marking/10103-dscpvalues.html
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