Layer 4 of the TCP/IP Model corresponds to which three Layer(s) of the OSI Model? (Choose three.)

The correct answer is C. Session D. Transport E. Presentation. The TCP/IP model has four layers. Layer 4 (the top layer) is the Application layer, which encompasses the functionality of three OSI layers: Session (Layer 5 in OSI), Presentation (Layer 6 in OSI), and Application (Layer 7 in OSI). In the TCP/IP model, these three OSI layers…

Submitted by rohit_dlh· Apr 18, 2026Cybersecurity Foundations

Question

Options

ANetwork
BApplication
CSession
DTransport
EPresentation

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(69 responses)

A
3% (2)
B
9% (6)
C
88% (61)

Explanation

The TCP/IP model has four layers. Layer 4 (the top layer) is the Application layer, which encompasses the functionality of three OSI layers: Session (Layer 5 in OSI), Presentation (Layer 6 in OSI), and Application (Layer 7 in OSI). In the TCP/IP model, these three OSI layers are collapsed into a single Application layer. The Transport layer (OSI Layer 4) maps to TCP/IP Layer 3 (Transport), and the Network layer (OSI Layer 3) maps to TCP/IP Layer 2 (Internet). Therefore, OSI Session (C), Transport (D), and Presentation (E) collectively represent TCP/IP's top layer.

Topics

#TCP/IP Model#OSI Model#Network Architecture#Protocol Layers

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