Description: The PDU (Protocol Data Unit) is a unit of information transmitted across a network, encapsulating data in a format that can be understood by network devices. Depending on the layer of the OSI model it is in, the PDU can have different names: at the application layer, it is called a message; at the transport layer, it is referred to as a segment (TCP) or datagram (UDP); at the network layer, it is known as a packet; and at the data link layer, it is called a frame. This structure allows data to be organized and managed efficiently during transmission, ensuring that information reaches its destination correctly and in the proper order. The PDU is essential for communication in various networking environments, including LANs and WANs, as it facilitates data routing and segmentation, optimizing bandwidth usage and improving service quality. Managing PDUs is crucial for the operation of network services, enabling the efficient allocation of resources and ensuring data integrity during transmission.
