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quality of service qos networkingShort Bytes: Quality of Service (QoS) becomes an important factor when you are in charge of managing a network. Based on the traffic type and its importance, you can assign priorities to different network traffics like admin traffic, production server traffic, testing server traffic etc.

The Quality of Service (QoS) was introduced in the computer networks field to give more priorities to some data packets over others.

You can relate it to something like this — There is a counter to serve people with movie tickets. But, there is a reservation at the counter. Some people have the privilege to stand in a separate row and this way, they are also served faster than others.

Analogically, replace the people with data packets. Some data packets have the privilege to be thrown on the network first compared to the other data packets. Maybe, because they have paid more to the ISP or for some other reasons.

So, let’s take a deeper look into the technicalities behind this.

The QoS has some inherent properties which define it technically more and better. These factors are:

  • Dedicated bandwidth
  • Controlled jitter
  • Latency, and
  • Improved data loss characteristics.

Also, this is very important to understand that if one of the data flows are processed earlier, that does not mean that other flows are getting failed. It’s just that other queues are being processed with lower priorities than the high-priority queues.

Gain from the QoS:

  • Control over resources

One of the biggest benefits of using QoS is that you can have control over different resources that are in use. For example, you can limit the bandwidth consumed over a backbone link by FTP transfers or give priority to an important database access.

Example:
Let’s say, you are the network administrator of an assigned network and there are many other users as well on the same network, let’s say, students.

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In that case, you can limit the bandwidth usage by them and you can also assign a higher priority to your FTP or Telnet commands and data packets transfer in the background. This will be done because to keep running a network, a network admin’s data access is more important than other users’.

  • More efficient use of network resources

This point may sound just like the first one but it talks more about the business and network analysis tool, network management etc.

Example:
Let’s say, your entire network is based on Cisco devices and you are also using RTMT (Real Time Monitoring Tool) to analyze your network data on the real time basis. Using this tool, you can know if the important network traffic is being served properly or not.

  • Serving Critical applications and services

Most of the companies have production and testing server for an app. The same was the case with the last company where I was working. When a new application version will be rolled out, they will be assigned to the testers to test the functionality of the application before making them available in the market.

However, if the applications which are already in the market are using your server, then you cannot compromise with the server’s speed if your user base is growing day after another.

Thus, in this case, keeping running the server becomes mission critical and on QoS basis, you can prioritize the server data and traffic.

Also, here are our more interesting topics in our ‘Explainer‘ series.

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