Data Link Layer (Layer 2)

The Data Link layer is responsible for the encoding of bits into the packets at sending side and decoding of packets back to the bits at reviving side. The data link layer functions are as follow

·  ·   Hardware Addressing (Physical Address)

   ·       Error Detection And Control

   ·        Flow Control

The data link layer is further divided into two layer

   ·        Media Access Control (MAC) layer

   ·        Logical Link Control (LLC) layer

The data link layer is mostly exist where the LAN and Wireless LAN exist. Some of the data link layer protocols are as follow

   ·        Ethernet

   ·        Token Ring

   ·        FDDI (Fiber Distributed Data Interface)

   ·        HDLC (High Level Data Link Control)

   ·        PPP (Point-To-Point Protocol)