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Questions and Answers
Which of the following is NOT a responsibility of the Data Link Layer protocol?
Which of the following is NOT a responsibility of the Data Link Layer protocol?
- Error detection
- Compression (correct)
- Retransmission
- Random access
Which layer of the OSI model is the Data Link Layer?
Which layer of the OSI model is the Data Link Layer?
- 3rd layer from the bottom
- 2nd layer from the top
- 3rd layer from the top
- 4th layer from the top (correct)
What is the main responsibility of the Data Link Layer?
What is the main responsibility of the Data Link Layer?
- Error correction
- Retransmission
- Flow control
- Transfer the datagram across an individual link (correct)
What is an important characteristic of the Data Link Layer regarding link layer protocols?
What is an important characteristic of the Data Link Layer regarding link layer protocols?
Which of the following is NOT a Data Link Layer protocol?
Which of the following is NOT a Data Link Layer protocol?
What is the purpose of encapsulating each network frame within a Link layer frame in Data Link Layer protocols?
What is the purpose of encapsulating each network frame within a Link layer frame in Data Link Layer protocols?
How does the Data Link Layer prevent the receiver's buffer from overflowing?
How does the Data Link Layer prevent the receiver's buffer from overflowing?
Which feature of the Data Link Layer protocol helps in identifying and locating errors in a transmitted frame?
Which feature of the Data Link Layer protocol helps in identifying and locating errors in a transmitted frame?
In the context of Data Link Layer protocols, what is the purpose of error correction mechanisms?
In the context of Data Link Layer protocols, what is the purpose of error correction mechanisms?
How does the Data Link Layer protocol achieve a reliable delivery service for network layer datagrams?
How does the Data Link Layer protocol achieve a reliable delivery service for network layer datagrams?
What role does flow control play in the Data Link Layer's operation to avoid overwhelming the receiving node?
What role does flow control play in the Data Link Layer's operation to avoid overwhelming the receiving node?
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Study Notes
Data Link Layer
- The Data Link Layer encapsulates each network frame within a Link layer frame before transmission across the link.
- A frame consists of a data field and multiple other fields, specifying the frame structure and channel access protocol.
Functions of Data Link Layer
- Provides reliable delivery service, transmitting network layer datagrams without errors.
- Manages flow control to prevent the sending node from overwhelming the receiving node.
- Performs error detection by adding error detection bits to the frame.
- Performs error correction, detecting and determining the location of errors in the frame.
Characteristics of Data Link Layer
- Located at the 2nd layer from the bottom of the OSI model.
- Responsible for transferring datagrams across individual links.
- Defines the format of packets exchanged across nodes and actions such as error detection, retransmission, flow control, and random access.
- Protocols include Ethernet, token ring, FDDI, and PPP.
- Datagrams can be handled by different link layer protocols on different links in a path.
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