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Layer 2. Datalink Layer

The second layer of the seven layers of Open Systems Interconnection (OSI) network model is called the Datalink layer. The Data Link layer resides above the Physical layer and below the Network layer. Datalink layer is responsible for providing end-to-end validity of the data being transmitted. The Data Link Layer is logically divided into two sublayers, The Media Access Control (MAC) Sublayer and the Logical Link Control (LLC) Sublayer.

Media Access Control (MAC) Sublayer determines the physical addressing of the hosts. The MAC sub-layer maintains MAC addresses (physical device addresses) for communicating with other devices on the network. MAC addresses are burned into the network cards and constitute the low-level address used to determine the source and destination of network traffic. MAC Addresses are also known as Physical addresses, Layer 2 addresses, or Hardware addresses.

The Logical Link Control sublayer is responsible for synchronizing frames, error checking, and flow control.

Layer 3. Network Layer
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