N10-005 Question #815: Real Exam Question with Answer & Explanation

The correct answer is B: Data link. The Data Link layer (Layer 2) of the OSI model is responsible for taking packets from the Network layer and encapsulating them into frames for transmission over a physical medium. A frame includes the data plus source/destination MAC addresses, error-checking information (like CR

Question

Which of the following OSI model layers is used to frame packets that are sent over a medium?

Options

ASession
BData link
CPhysical
DTransport

Explanation

The Data Link layer (Layer 2) of the OSI model is responsible for taking packets from the Network layer and encapsulating them into frames for transmission over a physical medium. A frame includes the data plus source/destination MAC addresses, error-checking information (like CRC), and framing delimiters. The Physical layer (C) handles the actual transmission of raw bits over the medium (electrical signals, light pulses, radio waves) but does not frame data. The Transport layer (D) handles end-to-end communication and segmentation (TCP/UDP). The Session layer (A) manages sessions and connections between applications. 'Framing' is the defining function of Layer 2.

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