Introduction

  • This layer is the lowest layer in the TCP/IP model.

Features

  • This layer contains the protocols that the computer uses to deliver data to the other computers and devices that are attached to the network via a cable or other media.

Functions

  • The protocols of this layer perform three distinct functions : –
    • They define how to use the network to transmit a frame, which is the data unit passed across the physical connection.
    • They exchange data between the computer and the physical medium of network.
    • They deliver data between two devices on the same network using the physical address.

Protocols

  • The network access layer includes a large number of  LAN ( all the variations of Ethernet protocols and other LAN standards ) and popular WAN standards ( Point-to-Point Protocol (PPP) and Frame Relay )protocols. 
  • The list of some important Network Interface layer’s protocols are – Ethernet, Token Ring, Frame Relay, ATM etc.

Ethernet

Token Ring

Frame Relay

ATM

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