SSCP · Question #1338
Layer 4 of the OSI model corresponds to which layer of the DoD model?
The correct answer is B. Layer 3 - Host to Host. Layer 4 (Transport Layer) of the OSI model is equivalent to Layer 3 (Host-to-Host Layer) of the DoD TCP/IP model, as both are responsible for end-to-end communication between hosts.
Question
Layer 4 of the OSI model corresponds to which layer of the DoD model?
Options
- ALayer 4 - Application
- BLayer 3 - Host to Host
- CLayer 2 - Internet
- DLayer 1 - Network
- ELayer 6 - Presentation
How the community answered
(32 responses)- A3% (1)
- B88% (28)
- C6% (2)
- E3% (1)
Why each option
Layer 4 (Transport Layer) of the OSI model is equivalent to Layer 3 (Host-to-Host Layer) of the DoD TCP/IP model, as both are responsible for end-to-end communication between hosts.
Layer 4 - Application in the DoD model maps to OSI Layers 5, 6, and 7, not just OSI Layer 4.
The Transport Layer (Layer 4) of the OSI model provides end-to-end communication services, including connection management, segmentation, and reliability, which directly corresponds to the Host-to-Host Layer (Layer 3) of the DoD TCP/IP model, responsible for the same functions between network hosts.
Layer 2 - Internet in the DoD model corresponds to OSI Layer 3 (Network Layer).
Layer 1 - Network in the DoD model corresponds to OSI Layers 1 (Physical) and 2 (Data Link).
Layer 6 - Presentation is an OSI model layer and does not correspond to OSI Layer 4.
Concept tested: OSI and DoD model layer mapping
Source: https://learn.microsoft.com/en-us/training/modules/network-fundamentals/7-compare-tcp-ip-model-osi-model
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