Hello, everyone!
Definition:
Quality of service (QoS) is a mechanism that guarantees an expected service level with respect to bandwidth, latency, jitter, and packet loss in a communication network. The following indicators are used to measure QoS:
1) Bandwidth: theoretical transmission capacities of a connection.
2) Latency: the time required for information to travel from one network node to another network node. A high latency impacts the quality of real-time services (for example, IP telephone service).
3) Jitter: variations in latency. Jitter can severely affect the quality of multimedia services (for example, VoD).
4) Packet loss rate: the percentage of lost packets to the total packets during network transmission.
Purpose:
QoS achieves the following purposes:
1) Provides users with assured bandwidth.
2) Regulates and controls IP network traffic.
3) Reduces the packet loss rate.
4) Specifies packet priorities.
5) Avoids and manages network congestion.
6) provides differentiated services for users.
Thanks.
