<ul><li>Protocol Data Units (PDUs) are the smallest units of data exchanged between entities in a network.</li><li>PDUs have a hierarchical structure in the OSI model, with different names at each layer such as segment, packet, frame, and bit.</li><li>The header of a PDU contains control information, while the payload carries the actual data being transmitted.</li><li>PDUs are vital for network communication as they enable encapsulation, modularity, and interoperability, and are essential for protocol parsing and analysis.</li></ul>

Understanding Protocol Data Units (PDUs): The Building Blocks of Network Communication

Discover more