350-801 · Question #494
Which type of traffic is marked as DSCP 46?
The correct answer is A. voice. DSCP 46 is the standard DiffServ Code Point marking used to prioritize real-time voice traffic in a network, ensuring its quality.
Question
Which type of traffic is marked as DSCP 46?
Options
- Avoice
- Bcall signaling
- CIP routing
- Dmission-critical data
How the community answered
(28 responses)- A93% (26)
- B4% (1)
- D4% (1)
Why each option
DSCP 46 is the standard DiffServ Code Point marking used to prioritize real-time voice traffic in a network, ensuring its quality.
Voice traffic, specifically RTP (Real-time Transport Protocol) streams carrying audio, is typically marked with DSCP 46, which corresponds to Expedited Forwarding (EF). This marking provides the highest priority treatment, crucial for meeting the stringent low-latency, low-jitter, and low-loss requirements of real-time voice communication.
Call signaling traffic (e.g., SIP, H.323) is commonly marked with a lower DSCP value, such as CS3 (24), distinct from voice media.
IP routing traffic is usually marked with DSCP CS6 (48) or CS7 (56) to maintain network stability, not DSCP 46.
Mission-critical data typically utilizes DSCP AF classes (e.g., AF31, AF41) or CS4/CS5, as DSCP 46 is reserved for the unique requirements of voice.
Concept tested: DSCP values for voice traffic (EF)
Source: https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND_40/QoSLevel3/QoS_L3_AppSect.html#wp1010377
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