QoS (Quality of Service)

QoS Quality of services

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

quality-of-service-forwarding-phb-1 quality-of-service-in-networking-router-1

 

Classification

It is the process of matching the fields in a message to make a choice to take some QoS action

 

quality-of-service-classification-1

 

Marking

It gives critical traffic preferential treatment to make sure it is quickly and reliably delivered

 

qos-marking-1

 

Queuing

Managing the queues that hold packets while they wait for their turn to exit an interface

qos-queuing-1

qos-queuing-2

qos-queuing-3

 

Congestion

It is a set of features to pre-emptively drop traffic within queues

 

qos-congestion-1

 

Policing

It is simply rate-limiting, as shown in below picture:

qos-policing-1

 

Shaping

It is simply the mechanism used to control the amount and the rate of traffic sent to the network

 

qos-shaping-1

 

 

-End-

 

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