Which layer includes the Media Access Control (MAC) and Logical Link Control (LLC) sub-layers?

Which layer includes the Media Access Control (MAC) and Logical Link Control (LLC) sub-layers?

• A. Data Link Layer
• B. Transport Layer
• C. Physical Layer
• D. Session Layer

Answer: (A)

The Data Link Layer is responsible for establishing, maintaining, and deciding how data is transferred over the physical link in a network. It serves as an interface between the physical layer, which deals with the transmission of raw bits over a physical medium, and the network layer, which is responsible for logical addressing and routing. Within the Data Link Layer, two important sub-layers are defined: the Media Access Control (MAC) sub-layer and the Logical Link Control (LLC) sub-layer. The MAC sub-layer governs how devices on the same physical network segment share and gain access to the medium, defining protocols that determine when and how transmissions can occur. It effectively manages the interaction with the network hardware. On the other hand, the LLC sub-layer provides an interface to the network layer above it. It adds additional functionalities, such as multiplexing and flow control, and is responsible for error checking and frame synchronization. Given this structure and function, the Data Link Layer is indeed the correct answer because it encompasses both the MAC and LLC sub-layers, enabling robust data transfer across different media types within a network.

The Data Link Layer is responsible for establishing, maintaining, and deciding how data is transferred over the physical link in a network. It serves as an interface between the physical layer, which deals with the transmission of raw bits over a physical medium, and the network layer, which is responsible for logical addressing and routing.

Within the Data Link Layer, two important sub-layers are defined: the Media Access Control (MAC) sub-layer and the Logical Link Control (LLC) sub-layer.

The MAC sub-layer governs how devices on the same physical network segment share and gain access to the medium, defining protocols that determine when and how transmissions can occur. It effectively manages the interaction with the network hardware.

On the other hand, the LLC sub-layer provides an interface to the network layer above it. It adds additional functionalities, such as multiplexing and flow control, and is responsible for error checking and frame synchronization.

Given this structure and function, the Data Link Layer is indeed the correct answer because it encompasses both the MAC and LLC sub-layers, enabling robust data transfer across different media types within a network.