What does network layer do?
The primary function of the network layer is to enable different networks to be interconnected. It does this by forwarding packets to network routers, which rely on algorithms to determine the best paths for the data to travel.
Why is network layer important?
It determines the route from the source to the destination and also manages the traffic problems such as switching, routing and controls the congestion of data packets. The main role of the network layer is to move the packets from sending host to the receiving host.
What are the three main functions of a network layer?
Functions of Network Layer:
- Internetworking: This is the main duty of network layer.
- Addressing: Addressing is necessary to identify each device on the internet uniquely.
- Routing: In a network, there are multiple roots available from a source to a destination and one of them is to be chosen.
What are the services of network layer?
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.
- Services.
- Connectionless communication.
- Host Addressing.
- Message Forwarding.
What is the first duty of the network layer?
The first duty of the network layer is to encapsulate the data coming from the upper layer in a datagram.
What are the protocols of network layer?
TCP/IP Protocol Architecture Model
| OSI Ref. Layer No. | OSI Layer Equivalent | TCP/IP Protocol Examples |
|---|---|---|
| 5,6,7 | Application, Session, Presentation | NFS, NIS+, DNS, telnet , ftp , rlogin , rsh , rcp , RIP, RDISC, SNMP, and others |
| 4 | Transport | TCP, UDP |
| 3 | Network | IP, ARP, ICMP |
| 2 | Data Link | PPP, IEEE 802.2 |
What happens in transport layer?
Layer 4 of the OSI Model: Transport Layer provides transparent transfer of data between end users, providing reliable data transfer services to the upper layers. The transport layer controls the reliability of a given link through flow control, segmentation and desegmentation, and error control.
Which devices are used in network layer?
Some of the Devices used in Network Layer are,
- Routers: A router is a switch like device that routes/forwards data packets based on their IP addresses.
- Brouters: A bridge router or brouter is a network device that works as a bridge and as a router.
What are the 4 basic processes used at the network layer?
The network layer defines communication over the network through four basic processes which are addressing, routing, encapsulation and decapsulation.