Which data link layer function provides node-to-node data transfer with error detection and flow control?

Which data link layer function provides node-to-node data transfer with error detection and flow control?

• A. To provide end-to-end routing across networks.
• B. To encrypt data for secure transmission.
• C. To provide node-to-node data transfer with error detection and flow control.
• D. To manage physical layer signaling standards.

Answer: (C)

The data link layer ensures reliable, node-to-node transfer over a single link by framing data and providing error detection and flow control. It adds a header/footer to each frame, uses mechanisms like CRC to detect errors in transmission, and implements flow control to prevent the receiving node from being overwhelmed—often with methods such as stop-and-wait or sliding window. End-to-end routing across networks is a network layer function, not the data link layer. Encrypting data is a security concern typically handled at higher layers. Managing physical layer signaling standards belongs to the physical layer. So the function that matches node-to-node data transfer with error detection and flow control is the data link layer responsibility.

The data link layer ensures reliable, node-to-node transfer over a single link by framing data and providing error detection and flow control. It adds a header/footer to each frame, uses mechanisms like CRC to detect errors in transmission, and implements flow control to prevent the receiving node from being overwhelmed—often with methods such as stop-and-wait or sliding window.

End-to-end routing across networks is a network layer function, not the data link layer. Encrypting data is a security concern typically handled at higher layers. Managing physical layer signaling standards belongs to the physical layer. So the function that matches node-to-node data transfer with error detection and flow control is the data link layer responsibility.