350-801 · Question #29
Which recommendation is the best practice for marking video and voice media in a cisco Unified Communications network?
The correct answer is D. Voice Cos 5 (IP Precedence 5, PHB EF, or DSCP 46). The question asks for the best practice in marking voice and video media traffic in a Cisco Unified Communications network, specifying the correct Class of Service (CoS), IP Precedence, Per-Hop Behavior (PHB), and Differentiated Services Code Point (DSCP) values.
Question
Which recommendation is the best practice for marking video and voice media in a cisco Unified Communications network?
Exhibit
Options
- AVoice Cos 5 (IP Precedence 6, PHB AF41, or DSCP 16)
- BVoice Cos 6 (IP Precedence 4, PHB AF41, or DSCP 24)
- CVoice Cos 5 (IP Precedence 2, PHB EF, or DSCP 48)
- DVoice Cos 5 (IP Precedence 5, PHB EF, or DSCP 46)
How the community answered
(28 responses)- A7% (2)
- C4% (1)
- D89% (25)
Why each option
The question asks for the best practice in marking voice and video media traffic in a Cisco Unified Communications network, specifying the correct Class of Service (CoS), IP Precedence, Per-Hop Behavior (PHB), and Differentiated Services Code Point (DSCP) values.
This choice lists AF41 and DSCP 16, which are typically used for video conferencing or mission-critical data, not the primary marking for voice media.
This choice suggests CoS 6 and DSCP 24 (AF31), which are incorrect values for standard voice media best practices.
This choice incorrectly combines CoS 5 with IP Precedence 2 and DSCP 48 (CS6), which is not the standard best practice for voice media.
Cisco best practices recommend marking voice media traffic as CoS 5, IP Precedence 5, PHB Expedited Forwarding (EF), and DSCP 46. These markings prioritize real-time voice traffic over other network traffic, ensuring low latency and jitter for high-quality voice communications. This ensures end-to-end QoS for voice calls.
Concept tested: Cisco QoS best practices for voice/video marking
Source: https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Campus/HA_qos/campus_ha_qos_dg/ha_qos_chap2.html
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