200-150 Question #137: Real Exam Question with Answer & Explanation

The correct answer is C: Model A is OSI, Model B is TCP/IP, Layer C is Transport, Layer D is Data Link, and Layer E is. The OSI model (Model A, 7 layers) and the updated TCP/IP model (Model B, 5 layers) share common layers including Transport and Data Link, which are correctly identified in answer C.

Question

Refer to the exhibit. Regarding the OSI networking model and the updated TCP/IP networking model, which statement about this scenario is true?

Exhibit

Options

AModel A is TCP/IP, Model B is OSI, Layer C is Transport, Layer D is Internet, and Layer E is
BModel A is OSI, Model B is TCP/IP, Layer C is Session, Layer D is Network, and Layer E is
CModel A is OSI, Model B is TCP/IP, Layer C is Transport, Layer D is Data Link, and Layer E is
DModel A is TCP/IP, Model B is OSI, Layer C is Transport, Layer D is Internet, and Layer E is

Explanation

The OSI model (Model A, 7 layers) and the updated TCP/IP model (Model B, 5 layers) share common layers including Transport and Data Link, which are correctly identified in answer C.

Common mistakes.

A. Assigning TCP/IP as Model A is incorrect because the TCP/IP model has fewer layers (4 or 5) than the 7-layer OSI model - TCP/IP cannot be the model with more granular layers.
B. While the model assignments are correct, labeling Layer C as Session is wrong because the Session layer exists only in OSI above Transport - both models share a Transport layer at the equivalent position where Layer C appears.
D. This answer incorrectly assigns TCP/IP as Model A, and labeling Layer D as Internet is only valid for the TCP/IP model - in the OSI model (the 7-layer model) the equivalent layer is called Network, not Internet.

Concept tested. OSI vs updated TCP/IP model layer mapping

Reference. https://www.cisco.com/en/US/docs/internetworking/technology/handbook/OSI-Layers.html

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