State the OSI Model and explain two of them
The OSI Model (Open Systems Interconnection Model) is a conceptual framework used to understand how different networking protocols and technologies communicate with each other. It is divided into seven layers, each layer responsible for a specific function in the network communication process.
1. Physical Layer: This is the lowest layer of the OSI Model and deals with the physical connection between devices. It defines the electrical, mechanical, and procedural standards for transmitting data over a network. This layer is concerned with the physical transmission of data, such as cables, switches, and network interfaces.
2. Data Link Layer: The Data Link Layer is responsible for the error-free transmission of data between devices on the same network. It provides error detection and correction, as well as framing, addressing, and flow control. This layer is where switches and bridges operate, ensuring that data packets are properly transmitted and received.