Computer Networks Lecture 10: Data Link Layer and Protocols
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Questions and Answers

What is the responsibility of the data link layer in a computer network?

Transferring datagram from one node to the physically adjacent node over a link.

How does the data link layer pick up data at the adjacent node?

It picks up data from hardware in the form of electrical signals, assembles them in a recognizable frame format, and hands them over to the upper layer.

What is the primary function of the data-link layer in a computer network?

Framing: encapsulating packets from the network layer into frames and sending each frame bit-by-bit on the hardware.

Give an example of hardware implementation of the data link layer.

<p>Ethernet card and 802.11 card.</p> Signup and view all the answers

What is the purpose of different link protocols in transferring datagrams?

<p>To transfer datagrams over different types of links, e.g., Ethernet on one link, 802.11 on another link.</p> Signup and view all the answers

What does the data link layer do with signals from the hardware at the adjacent node?

<p>Assembles them into frames.</p> Signup and view all the answers

What are the types of errors that can occur in the data unit?

<p>Single-bit error and Burst error.</p> Signup and view all the answers

What is the most common and least expensive mechanism for error-detection?

<p>Simple Parity Checking or One-dimension Parity Check.</p> Signup and view all the answers

What are the two sub-layers of the data link layer?

<p>Logical Link Control (LLC) and Media Access Control (MAC).</p> Signup and view all the answers

What does the Media Access Control (MAC) sublayer of the data link layer handle?

<p>Hardware addressing mechanism and controls physical media access.</p> Signup and view all the answers

What is the primary responsibility of the data link layer in a computer network?

<p>Encapsulating packets from the network layer into frames and sending them bit-by-bit on the hardware</p> Signup and view all the answers

What is the purpose of the Media Access Control (MAC) sublayer of the data link layer?

<p>Resolving IP addresses to MAC addresses for data transfer</p> Signup and view all the answers

How does the data link layer handle errors in data transfer?

<p>By implementing error detection and correction mechanisms</p> Signup and view all the answers

What is the function of the data link layer's MAC sublayer in a computer network?

<p>Resolving IP addresses to MAC addresses for data transfer</p> Signup and view all the answers

What is the key difference between wired and wireless links in terms of the data link layer protocols deployed?

<p>The wire protocol uses MAC sublayer, while wireless protocol does not</p> Signup and view all the answers

What does the data link layer do with signals from the hardware at the adjacent node?

<p>Picks up data in the form of electrical signals and assembles them into recognizable frame format</p> Signup and view all the answers

What does the Logical Link Control (LLC) sublayer of the data link layer handle?

<p>Framing and detecting errors</p> Signup and view all the answers

Which type of error refers to two or more bits in the data unit changing from 0 to 1 or vice versa?

<p>Burst error</p> Signup and view all the answers

What is the primary function of the Media Access Control (MAC) sublayer of the data link layer?

<p>Hardware addressing mechanism</p> Signup and view all the answers

Which mechanism for error detection organizes the block of bits in the form of a table?

<p>Two-dimensions Parity Check</p> Signup and view all the answers

What does the Cyclic Redundancy Check (CRC) provide in addition to error detection?

<p>Error correction</p> Signup and view all the answers

Which error detection mechanism adds a redundant bit called a parity bit to every data unit?

<p>Simple Parity Checking or One-dimension Parity Check</p> Signup and view all the answers

What is assumed about hardware addresses provided by the data-link layer?

<p>They are unique on the link.</p> Signup and view all the answers

What does the Data Link Layer ensure to enable machines to exchange data at the same speed?

<p>Flow control</p> Signup and view all the answers

What is the purpose of Error Correction in the data link layer?

<p>To recover actual data bits after encountering problems in transmission.</p> Signup and view all the answers

What is the primary responsibility of the Logical Link Control (LLC) sublayer of the data link layer?

<p>Dealing with framing and detecting errors.</p> Signup and view all the answers

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