101 · Question #635
In which layer of the OSI model is the data transported in the form of a packet?
The correct answer is C. Network. The Network layer (Layer 3) of the OSI model is responsible for logical addressing and routing, and its protocol data unit (PDU) is called a packet.
Question
In which layer of the OSI model is the data transported in the form of a packet?
Options
- ATransport
- BSession
- CNetwork
- DPresentation
How the community answered
(39 responses)- A3% (1)
- C95% (37)
- D3% (1)
Why each option
The Network layer (Layer 3) of the OSI model is responsible for logical addressing and routing, and its protocol data unit (PDU) is called a packet.
The Transport layer (Layer 4) uses segments (TCP) or datagrams (UDP) as its PDU, not packets.
The Session layer (Layer 5) manages communication sessions between applications and does not define a PDU called a packet.
At Layer 3 (Network), data is encapsulated into packets that contain source and destination IP addresses used for routing between networks. This layer is responsible for path determination and logical addressing. The packet is the defining PDU of the Network layer, distinguishing it from segments at Layer 4 and frames at Layer 2.
The Presentation layer (Layer 6) handles data formatting, encryption, and compression, and its PDU is simply referred to as data.
Concept tested: OSI model Network layer PDU identification
Source: https://learn.microsoft.com/en-us/windows-hardware/drivers/network/windows-network-architecture-and-the-osi-model
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