Which two parameters are examples of a QoS traffic descriptor? (Choose two)

Question

Options

• AMPLS EXP bits
• Bbandwidth
• CDSCP
• DToS
• Epacket size

• A
  94% (29)
• B
  3% (1)
• D
  3% (1)

Explanation

QoS Traffic Descriptors Explained

MPLS EXP bits (A) and DSCP (C) are QoS traffic descriptors because they are fields within packet headers specifically used to mark and classify traffic, allowing network devices to identify and apply appropriate QoS policies to different traffic flows. These markings "describe" the traffic type and its priority requirements to the network.

Why the distractors are wrong:

• Bandwidth (B) is a QoS parameter or resource that is allocated or guaranteed - it's what you're trying to manage, not a descriptor that marks traffic.
• ToS (D) is a legacy IPv4 header field that has been superseded by DSCP (DSCP is actually derived from the ToS byte), making DSCP the current standard descriptor.
• Packet size (E) is a traffic characteristic used in traffic shaping/policing calculations, not a header-based marking that describes QoS requirements.

Memory Tip: Think of traffic descriptors as labels on a package - DSCP and MPLS EXP bits are literal bit-level "labels" stamped in the header telling routers how to treat the traffic. If it's not a marking field in a header, it's probably not a descriptor.

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