Which sublayer is part of the data link layer in the OSI model?

Prepare for the NAB Domain 4 Communication and Network Security Test with multiple choice questions, detailed explanations, and study materials. Achieve top scores!

The correct answer is Logical Link Control. Within the OSI model, the Data Link layer is divided into two sublayers: the Logical Link Control (LLC) and the Media Access Control (MAC). The LLC sublayer is responsible for establishing and controlling the communication link between devices over a network. It provides services such as error detection and correction, and it allows different types of network protocols to operate over the same link, ensuring that data is properly sent and received.

The MAC sublayer, on the other hand, handles the protocol access to the physical network medium and determines how data packets are placed on the medium. Both LLC and MAC are vital components of the Data Link layer, but the LLC specifically focuses on the logical organization and control of the link layer functionality, which is why it is a part of this layer within the OSI model.

Other terms like Network Interface Control and Transmission Control Protocol do not accurately describe any recognized sublayer of the Data Link layer in the OSI model, as they either pertain to different layers or are not standard terminologies used in OSI discussions.

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