What is the protocol data unit used to describe a piece of data at the Network layer is OSI model?

Question

BlackTom AI · Accepted Answer

To begin, recall the OSI model layering and the typical protocol data unit (PDU) terms associated with each layer.
Option a: bits. This term is associated with the Physical layer PDUs, which describe the basic 0s and 1s transmitted over a medium, not a higher-layer data description.
Option b: frame. This is the PDU at the Data Link layer (and sometimes used in reference to frames on a link), which encapsulates data for transmission over a local network segment, not specifically the Network layer description.
Option c: packet. The Network layer is responsible for routing and forwarding packets across interconnected networks, and its PDU is commonly referred to as a packet, which describes a unit of data at this layer with addressing and routing information.
Option d: segment. The Transport layer uses the term segment as its PDU, containing ports and segmentation/reassembly information for end-to-end communication, not the Network layer’s description.
Thus, evaluating the layer-specific terminology, the term that best matches a piece of data at the Network layer is the packet, while the other options correspond to PDUs at other OSI layers or to different conceptual units.

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