What are the services provided by the Network Layer?

Network layer is the third layer in the OSI model of computer networking. Packet forwarding including routing through routers and quality of service management are done by the network layer.

Nature of the service

The transport layer at the host side receives the service provided by the network layer. But the transport layer resides in the hosts while the network layer resides in the subnet.

We know the subnet is a collection of routers which consists of only the bottom three layers. Hence, we can say that the service provided by the network layer to the transport layer is more effective, than the service provided by the subnet to the hosts.

Generally, the network layer provides two classes of well-defined services, namely connectionless and connection oriented services to the numerous nodes or hosts communicating through subnet.

Services

The different services provided by the network layer are as follows −

Connectionless communication

Network layer provides the facility of connection less transfer of data from one end to another. In connectionless communication one does not have to build a session with the receiver; it can be done at any time and no acknowledgement is required in this type of communication and this is possible because of the network layer.

Host Addressing

Every host in the network must have a unique address which determines where the host is located in the network. Every address on the internet is known as an ip address and this ip address is addressed by the network layer.

Message Forwarding

The message forwarding is another service provided by the network layer. Here, many networks are partitioned into sub networks and connected to other networks for wide area communications.

Network layer uses specialised hosts known as routers which are used to forward packets between different networks. The network layer also responds to service requests from the transport layer and issues service requests to the data link layer.

The services provided by the Network Layer are diagrammatically represented as follows −

Bhanu Priya

Published on 11-Sep-2021 07:29:21

• Related Questions & Answers
• What are services provided to transport layer by network layer?
• What are the Data Link Layer services provided to the Network Layer?
• What are the services provided by the transport layer?
• Explain the services provided by Network Layer in Computer Network.
• What are the functions of Network Layer?
• What are the Network Layer Design issues?
• What are the services of Network Security in Computer Network?
• What are the types of buttons provided by JavaFX?
• What are the User friendly interfaces provided by DBMS?
• Explain the services of the physical layer
• The Computer Network Layer
• What are the challenges faced by transport layer protocol?
• Functions of the Network Layer
• What is Session Layer in the Computer Network?
• What is network services terminology?