QoS (Quality of Service) is simply Traffic discrimination. QoS in Networking can also be defined as a set of technologies used to manage traffic and ensure the performance of critical applications. It enables firms or organizations to adjust their entire network by prioritizing certain high-performing applications.
Problems Solved by Quality of Service (QoS) in Networking
The problems that QoS solves are:
- It provides predictable management of network resources during times of congestion
- It helps in maximizing the end-user experience of critical sessions
- It provides differentiated services to packets based on pre-defined user criteria
Factors affected by Quality of Service (QoS) in Networking
The factors affected by QoS are Bandwidth, Delay, Jitter, and Data Loss (or Drops)
Forwarding PHB (per-hop behavior) for Quality of Service (QoS)
Forwarding per-hop behavior for QoS are grouped into the following: Classification, Marking, Queuing, Congestion, Policing, and Shaping
Classification
It is the process of matching the fields in a message to make a choice to take some QoS action
Marking
It gives critical traffic preferential treatment to make sure it is quickly and reliably delivered
Queuing
Managing the queues that hold packets while they wait for their turn to exit an interface
Congestion
It is a set of features to pre-emptively drop traffic within queues
Policing
It is simply rate-limiting, as shown in below picture:
Shaping
It is simply the mechanism used to control the amount and the rate of traffic sent to the network
-End-
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