Ühenduskiht

Ühenduskiht, also known as the connection layer, is a fundamental concept in network architecture, particularly within the Open Systems Interconnection (OSI) model. It is the second layer of the OSI model, positioned between the Physical Layer (Layer 1) and the Network Layer (Layer 3). The primary function of the ühenduskiht is to establish, maintain, and terminate connections between devices on a network. This layer is responsible for ensuring that data is transmitted reliably and efficiently between nodes.

Key responsibilities of the ühenduskiht include:

1. Connection Management: Establishing, maintaining, and terminating connections between devices.

2. Flow Control: Regulating the rate of data transmission to prevent congestion and ensure that data is sent and received at a manageable pace.

3. Error Control: Detecting and correcting errors that may occur during data transmission.

4. Sequencing: Ensuring that data packets are received in the correct order, even if they arrive out of sequence.

The ühenduskiht is implemented in various protocols, such as Ethernet at the data link layer and TCP (Transmission Control Protocol) at the transport layer. Ethernet, for example, handles the physical addressing and error detection, while TCP manages the connection establishment, data sequencing, and error correction.

In summary, the ühenduskiht plays a crucial role in network communication by providing the necessary mechanisms for reliable data transmission. Its functions are essential for the proper operation of higher-layer protocols and applications, ensuring that data is delivered accurately and efficiently across a network.