Question

The data link layer has a number of specific functions it can carry out. These functions include: (A) Providing a well-defined interface to the network layer
(B) Dealing with transmission errors
(C) Regulating the flow of data so that slow receivers are not swamped by fast senders
(D) Routing packets from the source machine to the destination machine
Choose the correct answer from the options given below:

• A. A, B and C only
• B. A, and C only
• C. A, B, and C only
• D. B, C and D only

Hint:

The data link layer is crucial for reliable communication between devices, focusing on data integrity and flow control. It does not handle routing, which is the responsibility of the network layer.

Answer 1

The Correct Option is C

The data link layer manages node-to-node data transfer and error checking for reliable communication. Its primary responsibilities are:- A. Interface to the Network Layer: It offers a defined interface for the network layer to transmit and receive data packets, ensuring correct passage to the physical layer. - B. Error Handling: This layer detects and corrects transmission errors using methods like checksums and Cyclic Redundancy Check (CRC). - C. Flow Control: It regulates data flow to prevent fast senders from overwhelming slow receivers via techniques like flow control.- D. Packet Routing: This function belongs to the network layer (Layer 3), not the data link layer.Step 2: Conclusion.
The data link layer is responsible for data transmission and error correction, but not for routing. Consequently, options A, B, and C accurately describe its functions. Therefore, the correct answer is (3) A, B, and C only.