200-150 Question #37: Real Exam Question with Answer & Explanation

The correct answer is A: transport. TCP (Transmission Control Protocol) operates at Layer 4, the Transport layer, of the OSI model. At this layer, data from the upper layers is encapsulated into TCP segments, which include source/destination port numbers, sequence numbers, acknowledgment numbers, and control flags.

Question

At which layer of the OSI Model is TCP traffic encapsulated?

Options

Atransport
Bdata-link
Cpresentation
Dapplication

Explanation

TCP (Transmission Control Protocol) operates at Layer 4, the Transport layer, of the OSI model. At this layer, data from the upper layers is encapsulated into TCP segments, which include source/destination port numbers, sequence numbers, acknowledgment numbers, and control flags. The Transport layer is responsible for end-to-end communication, flow control, and reliable delivery. UDP also lives at this layer. The Data Link layer (Layer 2) handles frames, the Presentation layer (Layer 6) handles data formatting/encryption, and the Application layer (Layer 7) interfaces with user-facing applications.

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