N10-005 Question #353: Real Exam Question with Answer & Explanation

The correct answer is C: Layers 5,6,7. The TCP/IP model compresses the seven OSI layers into four layers. The TCP/IP Application layer is the topmost and combines the functionality of three OSI layers: Layer 5 (Session)-managing sessions and connections; Layer 6 (Presentation)-data formatting, encryption, and encoding

Question

The TCP/IP application layer contains which of the following OSI layers?

Options

ALayers 1,5,6,7
BLayers 4,7
CLayers 5,6,7
DLayer 7

Explanation

The TCP/IP model compresses the seven OSI layers into four layers. The TCP/IP Application layer is the topmost and combines the functionality of three OSI layers: Layer 5 (Session)-managing sessions and connections; Layer 6 (Presentation)-data formatting, encryption, and encoding; and Layer 7 (Application)-user-facing protocols like HTTP, FTP, DNS, and SMTP. OSI Layers 1 and 2 map to the TCP/IP Network Access layer. Layer 3 maps to the Internet layer. Layer 4 maps to the Transport layer. Selecting only Layer 7 is incomplete, and including Layers 1 or 4 is incorrect.

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