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101 · Question #642
101 Question #642: Real Exam Question with Answer & Explanation
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
Explanation
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.
Common mistakes.
- A. 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.
- C. A bit is the PDU of the Physical Layer (OSI Layer 1), representing the raw binary signal transmitted over a physical medium.
- D. 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
Reference. https://learn.microsoft.com/en-us/azure/networking/fundamentals/osi-model
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