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Page 1 Data Link Layer Page 2 Data Link Layer Data Link Layer Design Issues Services Provided to the Network Layer Framing Error Control Flow Control Page 3 Data Link Layer Data Link Layer Design Issues Services Provided to the Network Layer Framing Error Control Flow Control Functions of the Data Link Layer Provide service interface to the network layer Dealing with transmission errors Regulating data flow Slow receivers not swamped by fast senders Page 4 Data Link Layer Data Link Layer Design Issues Services Provided to the Network Layer Framing Error Control Flow Control Functions of the Data Link Layer Provide service interface to the network layer Dealing with transmission errors Regulating data flow Slow receivers not swamped by fast senders Functions of the Data Link Layer (2) Relationship between packets and frames. Page 5 Data Link Layer Data Link Layer Design Issues Services Provided to the Network Layer Framing Error Control Flow Control Functions of the Data Link Layer Provide service interface to the network layer Dealing with transmission errors Regulating data flow Slow receivers not swamped by fast senders Functions of the Data Link Layer (2) Relationship between packets and frames. Services Provided to Network Layer (a) Virtual communication. (b) Actual communication.Read More
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FAQs on PPT: Data Link Layer - Computer Networks - Computer Science Engineering (CSE)
| 1. What is the purpose of the Data Link Layer in networking? |  |
Ans. The Data Link Layer is responsible for the reliable transfer of data between two devices over a physical link. It handles tasks such as framing, error detection and correction, flow control, and access control to ensure the efficient and error-free transmission of data.
| 2. What are the key functions of the Data Link Layer? | |
Ans. The Data Link Layer performs several functions, including framing, which involves breaking the data into smaller units called frames; error detection and correction, which ensures the integrity of the transmitted data; flow control, which regulates the flow of data between sender and receiver; and access control, which manages the access to the shared communication channel.
| 3. How does the Data Link Layer handle error detection and correction? | |
Ans. The Data Link Layer uses various techniques for error detection and correction. One commonly used method is the use of checksums, where a unique checksum value is calculated for each frame and appended to it. The receiver recalculates the checksum and compares it with the received value to detect errors. If an error is detected, retransmission or other error recovery mechanisms are employed to correct the errors.
| 4. What is the role of flow control in the Data Link Layer? | |
Ans. Flow control in the Data Link Layer ensures that the sender and receiver operate at compatible speeds to prevent data loss or overflow. It regulates the rate of data transmission by using techniques such as sliding window protocols, where the sender keeps track of the number of frames the receiver can accept and adjusts its transmission accordingly.
| 5. How does the Data Link Layer handle access control? | |
Ans. The Data Link Layer implements access control mechanisms to manage the access to the shared communication channel. One commonly used access control method is the Carrier Sense Multiple Access with Collision Detection (CSMA/CD), where devices listen for carrier signals on the channel before transmitting. If a collision occurs, the devices involved wait for a random time before retrying. This helps in avoiding data collisions and ensuring fair access to the channel for all devices.
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