Describe the difference between Class of Service (CoS) and Differentiated Services Code Point (DSCP).

Question

Options

• ACoS is only used to determine CLASS of traffic DSCP is only used to differentiate between
• BCoS is only contained in VLAN Tag fields DSCP is in the IP Header and preserved throughout the
• CThey are similar and can be used interchangeably.
• DCoS has much finer granularity than DSCP

• A
  3% (1)
• B
  93% (27)
• C
  3% (1)

Explanation

CoS and DSCP are both methods of marking packets for quality of service (QoS) purposes. QoS is a mechanism that allows network devices to prioritize and differentiate traffic based on certain criteria, such as application type, source, destination, etc. CoS stands for Class of Service and is a 3-bit field in the 802.1Q VLAN tag header. CoS can only be used on Ethernet frames that have a VLAN tag, and it can only be preserved within a single VLAN domain. DSCP stands for Differentiated Services Code Point and is a 6-bit field in the IP header. DSCP can be used on any IP packet, regardless of the underlying layer 2 technology, and it can be preserved throughout the IP packet flow, unless it is modified by intermediate devices.

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