SSCP Question #1338: Real Exam Question with Answer & Explanation

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.

Submitted by rania.sa· Apr 18, 2026Network and Communications Security

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

Explanation

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.

Common mistakes.

A. Layer 4 - Application in the DoD model maps to OSI Layers 5, 6, and 7, not just OSI Layer 4.
C. Layer 2 - Internet in the DoD model corresponds to OSI Layer 3 (Network Layer).
D. Layer 1 - Network in the DoD model corresponds to OSI Layers 1 (Physical) and 2 (Data Link).
E. Layer 6 - Presentation is an OSI model layer and does not correspond to OSI Layer 4.

Concept tested. OSI and DoD model layer mapping

Reference. https://learn.microsoft.com/en-us/training/modules/network-fundamentals/7-compare-tcp-ip-model-osi-model

Topics

#OSI Model#DoD Model#Network Layers#Model Comparison

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