Which is a function of the Logical Link Control (LLC) sublayer?
The Logical Link Control (LLC) sublayer is responsible for providing a reliable data link for the network layer.
It is the uppermost sublayer in the Data Link Layer of the OSI model and acts as an interface between the network layer and the Media Access Control (MAC) sublayer.
The key functions of the LLC sublayer are as follows:
1. Framing: The LLC sublayer encapsulates network layer data into frames by adding header and trailer information. This framing process helps in identifying the start and end of frames during transmission.
2. Flow Control: The LLC sublayer manages the flow of data between the sender and receiver. It provides mechanisms to avoid overwhelming the receiver with too much data by implementing flow control techniques such as windowing, acknowledgment, and pacing.
3. Error Control: The LLC sublayer ensures the integrity of data by implementing error detection and correction techniques. It uses methods such as checksums or cyclic redundancy checks (CRC) to detect errors in frames and retransmits them if required.
4. Multiplexing/Demultiplexing: The LLC sublayer supports multiplexing and demultiplexing of data from multiple network layer protocols. It allows multiple protocols to share the same physical medium and separates the received frames based on their protocol identifiers.
5. Connection establishment and termination: The LLC sublayer facilitates the establishment, maintenance, and termination of logical connections between devices. It provides mechanisms for session management, including negotiation of connection parameters and error recovery during connection setup and termination.
6. QoS (Quality of Service): The LLC sublayer supports the implementation of QoS mechanisms to ensure efficient data transmission. It can prioritize certain types of traffic, allocate bandwidth, and manage congestion control to maintain the required quality of service for different network applications.
Overall, the LLC sublayer plays a crucial role in ensuring reliable and efficient communication between network devices by providing services and functions that enable error-free data transmission, flow control, multiplexing, and connection management.
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