Description: The link layer is the second layer of the OSI (Open Systems Interconnection) model, responsible for the transfer of data between nodes in a network. Its main function is to provide a reliable means for communication between connected devices, ensuring that data is transmitted without errors and in the correct order. This layer deals with error detection and correction, as well as flow control, allowing devices to communicate efficiently. Additionally, the link layer handles physical addressing, using MAC addresses to identify devices on a local network. In terms of protocols, it includes technologies such as Ethernet, Wi-Fi, and PPP (Point-to-Point Protocol), which are fundamental for connectivity in various network environments. The link layer acts as a bridge between the physical layer, which deals with the transmission of bits over physical media, and the network layer, which is responsible for routing packets across multiple networks. Its importance lies in establishing the foundations for effective and reliable communication in networking, which is essential for the operation of applications and services today.
