101 · Question #557
Which protocol data unit (PDU) is associated with the OSI model Network layer?
The correct answer is B. Packet. The OSI Network layer (Layer 3) uses the packet as its protocol data unit, which carries logical source and destination addresses used for routing between networks.
Question
Which protocol data unit (PDU) is associated with the OSI model Network layer?
Options
- AFrame
- BPacket
- CSegment
- DBit
How the community answered
(21 responses)- A5% (1)
- B90% (19)
- D5% (1)
Why each option
The OSI Network layer (Layer 3) uses the packet as its protocol data unit, which carries logical source and destination addresses used for routing between networks.
A frame is the PDU of the OSI Data Link layer (Layer 2), used for node-to-node delivery within the same network segment, not for inter-network routing.
The Network layer (Layer 3) encapsulates data into packets containing IP source and destination addresses, which routers inspect to forward traffic across different networks. This is distinct from the PDUs of adjacent layers - frames at Layer 2 and segments at Layer 4.
A segment is the PDU of the OSI Transport layer (Layer 4), used by protocols such as TCP to provide end-to-end communication with sequencing and flow control.
A bit is the PDU of the OSI Physical layer (Layer 1), representing the raw electrical, optical, or radio signals transmitted over a physical medium.
Concept tested: OSI model Layer 3 protocol data unit identification
Source: https://www.cisco.com/c/en/us/support/docs/ibm-technologies/logical-link-control-llc/10051-17.html
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