What two factors are used to achieve end-to-end QoS in the DiffServ model? (Choose two.)

What two factors are used to achieve end-to-end QoS in the DiffServ model? (Choose two.)

• DSCP
• PHB
• PCP
• DEI
• VLAN ID

Explanation: IIn order to deliver end-to-end QoS, DiffServ architecture has two major components, packet marking using the IPv4 ToS byte and PHBs. The Differentiated Services (DS) field uses 6 bits to classify packets. DSCP uses the leftmost six bits from the ToS byte in the IPv4 header to specify class of service for each IP packet to form the DiffServ (DS) field. With 6 bits, DSCP has up to 64 DSCP values (0 to 63) that are assigned to various classes of traffic. These selective values are called per-hop behaviors (PHB) and determine how packets are treated at each hop along the path from the source to the destination.

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