Ethernet Addressing Framing and Error Detection

Ethernet Addressing Framing and Error Detection

Ethernet addressing, framing, and error detection are essential components of the Ethernet data link layer protocol. Here’s a brief overview of each:

Addressing: Ethernet uses 48-bit MAC (Media Access Control) addresses to uniquely identify each device on a network. MAC addresses are assigned by the manufacturer and are embedded in the network interface card (NIC) of each device. When a device sends a message on the network, it includes the destination MAC address in the message header so that the receiving device knows where to send its response.

Framing: Ethernet uses a frame structure to encapsulate the data being transmitted. The Ethernet frame includes the source and destination MAC addresses, as well as other control information such as the frame type and length. The data being transmitted is also included in the frame. Ethernet frames are transmitted using CSMA/CD (Carrier Sense Multiple Access with Collision Detection) protocol to avoid collisions on the network.

Error Detection: To ensure the integrity of the data being transmitted, Ethernet uses a cyclic redundancy check (CRC) algorithm to detect errors in the frame. When a frame is received, the receiving device calculates the CRC and compares it to the CRC in the frame header. If the two CRCs match, the frame is considered valid and is processed. If they do not match, the frame is discarded.

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