Answer :

Label switching is a QoS technique that replaces the IP datagram header with a label at the first router a data stream encounters.

What is QoS technique?

QoS (Quality of Service) is a networking technique that is used to manage and control the performance of a network. It is used to ensure that critical applications or services are given priority over less critical ones. QoS can be used to improve network performance, prioritize traffic and manage congestion. It can also be used to provide service level agreements (SLAs) between users and providers. QoS is implemented using a variety of methods, including packet scheduling, traffic shaping, packet marking, packet policing, resource reservation and traffic engineering. By using these techniques, QoS can be used to give preferential treatment to certain types of traffic, ensuring that important applications, such as voice and video, have the bandwidth they need to operate properly.

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