Value Description
000 (0) Routine or Best Effort
001 (1) Priority
010 (2) Immediate
011 (3) Flash - mainly used for Voice Signaling or for Video.
100 (4) Flash Override
101 (5) Critical -mainly used for Voice RTP.
110 (6) Internet
111 (7) Network
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus1000/sw/4_0/qos/configuration/guide/nexus1000v_qos/qos_6dscp_val.pdf
IP Precedence value 5 or DSCP EF will normally be used for voice traffic while IP precedence value 3 or DSCP CS3 or AF31 is used for **call signaling** - Answer is A
In Quality of Service (QoS) implementations that use IP Precedence values for packet classification, the IP Precedence value typically used to classify call signaling packets is "5" (also known as "Expedited Forwarding" or EF).
The IP precedence is a 3-bit field in TOS that threats high priority packets as more important than other packets. In contrast, DSCP is 6 bits of the Differentiated Services Field (DS Field) in the IP header for packet classification purposes.
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