Cisco QOS Terminology

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Last updated: August 22, 2022

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First submitted	August 22, 2022
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Hint	Answer
Speed/capacity of link	Bandwidth
Time between sending and receiving a packet	Delay
Variation in one-way delay	Jitter
Number of lost messages	Loss
Users' perception of application	QoE
Non-interactive data traffic	Batch Traffic
Point in path of a packet where QoS can be trusted	Trust Boundary
Prioritizes certain queues over others	Classifier
Cycles through queues in order	Round-Robin Scheduling
More or less packets from each queue are sent each cycle	Weighting
Assigns a minimum amount of bandwidth to each class	CBWFQ
Queue never gets to transmit because LLQ is always active	Queue Starvation
Discards packets if above bit rate threshold	Policers
Holds packets in queues if above bit rate threshold	Shapers
TCP flow control mechanism	Windowing

Hint	Answer
Number of bytes sender can send over TCP connection before a TCP ack is required	Windowing
Drops packets incoming to a full queue	Tail Drop
All packets in queue are dropped	Full Drop
DSCP	Differentiated Services Code Point
ToS	Type of Service
NBAR2	Enhanced Cisco Network Based Application Recognition
CoS	Class of Service
PCP	Priority Code Point
EF	Expedited Forwarding
AF	Assured Forwarding
CS	Class Selector
FIFO	First in First Out
CBWFQ	Class-Based Weighted Fair Queuing
LLQ	Low Latency Queuing
CAC	Call Admission Control

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