ENSA 9.5.6-9.5.9 -- L3 Markings

Match the acronym to the correct description for marking packet header's (L3 marking).

• inform downstream routers of congestion

• IPP

• IPv4 field

• ToS

• 3 bits

  8 classes

• ECN

• 6 bits

  64 classes

• Traffic Class

• IPv6 field

• DSCP

DSCP is better than IPP for L3 marking because . . .

(Choose 2)

• It uses 6 bits

• It has 64 possible classes of service

• It uses 8 bits

• It has 255 possible classes of service.

The DSCP values are organized into 3 categories.

Match the categories to the correct description.

• recommended for voice traffic

• AF

• default for all packets

• BE

• determines drop probability

• EF

What is the lowest and highest DSCP value?

• 0, 63

• 1, 64

• 0, 255

• 1. 1, 255

Which of the following is used for L2 Frame Markings?

• PRI field

• ToS field

• Traffic Class field

Which of the following is used for L3 IPv4 Packet Marking?

• PRI field

• ToS field

• Traffic Class field

Which of the following is used for L3 IPv6 Packet Marking?

• PRI field

• ToS field

• Traffic Class field