# Computer Networks Lecture 10: Data Link Layer

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## 20 Questions

### What mechanism for error detection involves appending a redundant bit to every data unit to make the total number of 1s in the unit even?

Simple Parity Checking

### Which sublayer of the data link layer is responsible for hardware addressing mechanism and controlling physical media access?

Media Access Control (MAC)

Burst Error

802.11

### Which error detection mechanism organizes the block of bits in a table and calculates parity check bits for each row and column to not only detect but also correct errors?

Two-dimensions Parity Check

### What is the responsibility of the data link layer?

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

### What does the data link layer do with packets from the network layer?

Encapsulates them into frames

### Which hardware example illustrates the implementation of the data link layer?

Ethernet card and 802.11 card

Framing

Bit-by-bit

### 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 by converting data stream to signals bit by bit and sending them over the underlying hardware.

### How does the data link layer handle datagrams at the adjacent node?

The data link layer picks up data from the hardware, assembles them into a recognizable frame format, and hands them over to the upper layer.

### What is the function of framing in the data-link layer?

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

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

Ethernet card and 802.11 card

### What are the two sub-layers of the data link layer, and what are their respective functions?

Logical Link Control (LLC) and Media Access Control (MAC). LLC deals with framing, flow control, error detection, and correction. MAC is responsible for hardware addressing and controls physical media access.

### Explain the difference between single-bit error and burst error in data transmission.

Single-bit error means that only one bit of a data unit is changed, while burst error means that two or more bits in the data unit have changed, not necessarily in consecutive bits.

### What is the primary purpose of the Cyclic Redundancy Check (CRC) mechanism in error detection?

The primary purpose of CRC is to detect errors in transmitted data.

### How does the simple parity check mechanism improve error detection?

The simple parity check appends a redundant bit to every data unit to ensure that the total number of 1s in the unit, including the parity bit, is even.

### What types of errors are addressed by the Error Control function of the data link layer, and how are these errors handled?

Error Control handles errors caused by signal attenuation, noise, and bit flips. These errors are detected and attempted to be recovered through error detection and correction mechanisms.

This quiz covers the concept of Data Link layer in computer networks, including its functions, protocols, types of errors, and terminology. It also explores the responsibility of the data-link layer in transferring datagrams between nodes over communication links.

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