During deployment, a network engineer notices that voice traffic is not being tagged correctly as it traverses the network. Which COS to DSCP map must be modified to ensure that voice traffic is treated properly?

IT Questions BankCategory: CCNPDuring deployment, a network engineer notices that voice traffic is not being tagged correctly as it traverses the network. Which COS to DSCP map must be modified to ensure that voice traffic is treated properly?
During deployment, a network engineer notices that voice traffic is not being tagged correctly as it traverses the network. Which COS to DSCP map must be modified to ensure that voice traffic is treated properly? 1ITExamAnswers Staff asked 4 months ago

Question:
During deployment, a network engineer notices that voice traffic is not being tagged correctly as it traverses the network. Which COS to DSCP map must be modified to ensure that voice traffic is treated properly?

  • A. COS of 5 to DSCP 46
  • B. COS of 7 to DSCP 48
  • C. COS of 6 to DSCP 46
  • D. COS of 3 to DSCP of 26

Explanation: CoS value 5 is commonly used for VOIP and CoS value 5 should be mapped to DSCP 46. DSCP 46 is defined as being for EF (Expedited Forwarding) traffic flows and is the value usually assigned to all interactive voice and video traffic. This is to keep the uniformity from end-to-end that DSCP EF (mostly for VOICE RTP) is mapped to COS 5.
Note:

+ CoS is a L2 marking contained within an 802.1q tag,. The values for CoS are 0 – 7

+ DSCP is a L3 marking and has values 0 – 63

+ The default DSCP-to-CoS mapping for CoS 5 is DSCP 40

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