An engineer is configuring QoS for a Cisco Unified Communications Manager implementation. Which two markings can be used for voice traffic? (Choose two.)
A. dscp ef
B. cos 6
C. ip precedence 5
D. dscp 5
E. cos 4
F. ip precedence 3
Which two markings can be used for voice traffic?
I agree
RTP audio (DSCP EF and IP Precedence 5)
CoS 5 = DSCP EF
IP Precedence 3 ; Flash (signaling)
IP Precedence 4 ;Flash override (Video)
IP Precedence 5 ;Critical (RTP—Audio)
I agree, if RTP traffic is meant A+C would be correct
Voice Packets/RTP Traffic
This includes any audio-bearing packet that uses the IP/UDP/RTP protocol stack. All UDP packets are unacknowledged. Therefore, the implementation of QoS mechanisms for this type of traffic is critical in order to ensure voice quality from end-to-end. By default, Cisco CallManager always instructs controlled end devices (IP phones, some MGCP gateways, and so forth) to use a DSCP value of 46 (EF or IP precedence 5). For IOS-based gateways (using MGCP or H.323 for signaling), this is the default value but can be changed on the CLI. There is also an option with Cisco CallManager to change this value. However, Cisco very strongly recommends that it not be changed from the default service.
https://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-communications-manager-callmanager/43587-ccm-and-qos.html
If it is voice traffic. (not signaling) shouldn’t it be A abd C?
I agree, if RTP traffic is meant A+C would be correct
Voice Packets/RTP Traffic
This includes any audio-bearing packet that uses the IP/UDP/RTP protocol stack. All UDP packets are unacknowledged. Therefore, the implementation of QoS mechanisms for this type of traffic is critical in order to ensure voice quality from end-to-end. By default, Cisco CallManager always instructs controlled end devices (IP phones, some MGCP gateways, and so forth) to use a DSCP value of 46 (EF or IP precedence 5). For IOS-based gateways (using MGCP or H.323 for signaling), this is the default value but can be changed on the CLI. There is also an option with Cisco CallManager to change this value. However, Cisco very strongly recommends that it not be changed from the default service.
https://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-communications-manager-callmanager/43587-ccm-and-qos.html