101 · Question #642
Which protocol data unit (POU) is associated with the OSI model's Network layer
The correct answer is B. Datagram. The OSI Network Layer (Layer 3) uses the datagram (packet) as its protocol data unit (PDU), which contains IP header information for routing between networks.
Question
Which protocol data unit (POU) is associated with the OSI model's Network layer
Options
- ASegment
- BDatagram
- CBit
- DFrame
How the community answered
(42 responses)- A10% (4)
- B86% (36)
- C2% (1)
- D2% (1)
Why each option
The OSI Network Layer (Layer 3) uses the datagram (packet) as its protocol data unit (PDU), which contains IP header information for routing between networks.
A segment is the PDU of the Transport Layer (OSI Layer 4), used by protocols such as TCP to manage end-to-end connection and data sequencing.
The PDU at the Network Layer is the datagram (also called a packet), which encapsulates upper-layer data with an IP header containing source and destination addresses. This allows each datagram to be independently routed across interconnected networks to reach its destination.
A bit is the PDU of the Physical Layer (OSI Layer 1), representing the raw binary signal transmitted over a physical medium.
A frame is the PDU of the Data Link Layer (OSI Layer 2), used to encapsulate packets with MAC addressing for delivery across a single local network segment.
Concept tested: OSI Network Layer PDU identification
Source: https://learn.microsoft.com/en-us/azure/networking/fundamentals/osi-model
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