QoS

Question 1

CIR

Answer 1

Committed Information Rate-

Policed traffic rate defined in a contract

Question 2

Tc

Answer 2

Committed Time Interval

Time in milliseconds over which the committed burst is sent.

Question 3

Bc

Answer 3

Committed Burst Size

Maximum size of the CIR token bucket in bytes. Maximum amount that can be transmitted in a Tc.

Question 4

Token

Answer 4

1 byte or 8 bits. Used with Token buckets in policing and shaping.

Question 5

Token Bucket

Answer 5

bucket that accumulates tokens until a predefined number is reached (such as the Bc).

Packets take tokens as they move through the switch.

Question 6

PCP

Answer 6

Priority Code Point- 802.1p

0-7 Ranking of traffic priority (lowest to highest)

Question 7

BE

Answer 7

Best effort. Value 1 in 802.1p

Question 8

NC

Answer 8

Network Control. 802.1p value 7

Question 9

LLQ

Answer 9

Low Latency Queuing

Congestion Management that combines CBWFQ with PQ to guarantee latency up to a bandwidth limit (so it won’t starve other queues).

Question 10

CBWFQ

Answer 10

Congestion Management that alls for 256 traffic queues and 256 traffic classes. No latency guarantee