Data Link Layer: Error Detection, MAC Addressing, Ethernet, Bridges, and Switches

Question 1

Which of the following is **not** a function of the Data Link Layer?

Accepted Answer

Routing

Answer

Error detection and correction

Answer

Frame synchronization

Answer

Flow control

Question 2

What is the primary error detection mechanism used in Ethernet?

Accepted Answer

Cyclic redundancy check (CRC)

Answer

Checksum

Answer

Parity bit

Answer

Hamming code

Question 3

In the Data Link Layer, which technique actively corrects errors, rather than just detecting them?

Accepted Answer

Hamming code

Answer

Checksum

Answer

CRC (Cyclic Redundancy Check)

Answer

Parity bit

Question 4

Which error detection technique uses a simple checksum to detect transmission errors?

Accepted Answer

Parity Checking

Answer

Cyclic Redundancy Check (CRC)

Answer

Hamming Code

Answer

Reed-Solomon Code

Question 5

What is the primary function of the Media Access Control (MAC) address on a network device?

Accepted Answer

To identify devices and facilitate communication

Answer

To route data packets to their intended destinations

Answer

To provide error correction and ensure data integrity

Answer

To control network bandwidth and optimize performance

Question 6

Which type of network topology utilizes a central hub or switch to connect devices?

Accepted Answer

Star Topology

Answer

Bus Topology

Answer

Ring Topology

Answer

Mesh Topology

Question 7

What is the standard maximum transmission speed of a Fast Ethernet network?

Accepted Answer

100 Mbps

Answer

10 Mbps

Answer

1 Gbps

Answer

10 Gbps

Question 8

Which network device filters network traffic based on MAC addresses and forwards it to specific destinations?

Accepted Answer

Switch

Answer

Router

Answer

Bridge

Answer

Hub

Question 9

Which type of switch operates by receiving and storing the entire frame before forwarding it, ensuring data integrity?

Accepted Answer

Store-and-forward switch

Answer

Cut-through switch

Answer

Fragment-free switch

Answer

Virtual LAN switch

Question 10

In the OSI model, which layer is directly responsible for controlling data link layer communication and ensuring reliable data transfer?

Accepted Answer

Data Link Layer

Answer

Physical Layer

Answer

Network Layer

Answer

Transport Layer

Question 11

What is the primary objective of the Data Link Layer in network communication?

Accepted Answer

To transmit and receive data over a network

Answer

To establish and maintain network connections

Answer

To handle routing and forwarding of data packets

Answer

To provide encryption and security measures

Question 12

Which error detection technique involves adding an extra bit to the data frame to indicate the parity of 1's in the frame?

Accepted Answer

Parity check

Answer

Checksum

Answer

CRC

Answer

Hamming code

Question 13

What is the primary purpose of a MAC address?

Accepted Answer

To uniquely identify a device on a network

Answer

To route packets between networks

Answer

To store data temporarily

Answer

To provide encryption

Question 14

Which of the following is NOT a valid Ethernet frame type?

Accepted Answer

IEEE 802.11 frame

Answer

Ethernet II

Answer

802.3 frame

Answer

Ethernet 2.5GBASE-T

Question 15

What is the main function of a bridge in a network?

Accepted Answer

To connect and forward data between network segments

Answer

To filter and forward packets based on MAC addresses

Answer

To provide a physical connection between devices

Answer

To store data and provide backup

Question 16

Which layer of the OSI model is responsible for error checking and correction?

Accepted Answer

Data link layer

Answer

Physical layer

Answer

Network layer

Answer

Transport layer

Question 17

What is a primary advantage of using a switch over a hub in a network?

Accepted Answer

Improved performance due to dedicated connections

Answer

Increased security due to port isolation

Answer

Lower cost

Answer

Greater scalability

Question 18

What does the term 'duplex' refer to in the context of Ethernet?

Accepted Answer

The direction of data flow

Answer

The number of simultaneous connections allowed

Answer

The type of cable used

Answer

The speed of the connection

Question 19

Which of the following is NOT a function of the Data Link Layer?

Accepted Answer

Encryption

Answer

Error detection and correction

Answer

Framing

Answer

Flow control

Question 20

What is the role of the preamble in an Ethernet frame?

Accepted Answer

To synchronize the receiver with the sender

Answer

To provide error checking information

Answer

To identify the source and destination addresses

Answer

To contain the data payload

Question 21

Which error detection technique calculates a checksum based on the data and includes it within the frame?

Accepted Answer

Cyclic Redundancy Check (CRC)

Answer

Hamming code

Answer

Parity bit

Answer

Reed-Solomon code

Question 22

What is the primary function of a MAC address?

Accepted Answer

To uniquely identify a specific device connected to a network

Answer

To route data across the internet

Answer

To store user data

Answer

To control network access

Question 23

Within the OSI model, which layer encompasses data link layer protocols such as Ethernet?

Accepted Answer

Data link layer

Answer

Physical layer

Answer

Network layer

Answer

Transport layer

Question 24

Which error correction technique involves retransmitting lost or corrupted data frames?

Accepted Answer

Automatic Repeat Request (ARQ)

Answer

Forward Error Correction (FEC)

Answer

Cyclic Redundancy Check (CRC)

Answer

Hamming code

Question 25

What is the maximum frame size, in bytes, for Ethernet transmission?

Accepted Answer

1500

Answer

2000

Answer

2500

Answer

3000

Question 26

Which medium access control method is employed in Ethernet networks?

Accepted Answer

Carrier Sense Multiple Access with Collision Detection (CSMA/CD)

Answer

Token passing

Answer

Polling

Answer

Slotted ALOHA

Question 27

In a network topology, which configuration connects all devices to a central point?

Accepted Answer

Star

Answer

Bus

Answer

Ring

Answer

Mesh

Question 28

What is the primary responsibility of a data link layer protocol?

Accepted Answer

To ensure reliable data transmission over a physical link

Answer

To establish and manage network connections

Answer

To route data packets across multiple networks

Answer

To provide user authentication and authorization

Question 29

What Data Link Layer technique retransmits data when an error occurs?

Accepted Answer

ARQ (Automatic Repeat Request)

Answer

CRC (Cyclic Redundancy Check)

Answer

FEC (Forward Error Correction)

Answer

Hamming Code

Question 30

Which error detection technique involves adding an additional bit to each data unit to indicate whether the number of 1s in the unit is odd or even?

Accepted Answer

Parity check

Answer

Checksum

Answer

Cyclic Redundancy Check (CRC)

Answer

Hamming code

Question 31

Which of the following is NOT a responsibility of the Data Link Layer?

Accepted Answer

IP address assignment

Answer

Error detection and correction

Answer

Flow control

Answer

Encapsulation

Question 32

What is the primary purpose of a Media Access Control (MAC) address?

Accepted Answer

To uniquely identify a device on a network

Answer

To store the IP address of a device

Answer

To control the flow of data between devices

Answer

To detect and correct errors in data transmission

Question 33

Which type of Ethernet frame is used for communication between two specific devices?

Accepted Answer

Ethernet II

Answer

Ethernet III

Answer

802.3 LLC

Answer

802.3 SNAP

Question 34

What is the purpose of the Cyclic Redundancy Check (CRC) field in an Ethernet frame?

Accepted Answer

To detect errors in data transmission

Answer

To provide flow control

Answer

To store the MAC address of the destination device

Answer

To indicate the type of data being transmitted

Question 35

What is the maximum size of an Ethernet frame, known as the Maximum Transmission Unit (MTU)?

Accepted Answer

1500 bytes

Answer

512 bytes

Answer

1024 bytes

Answer

2048 bytes

Question 36

In network communication, what is the main purpose of MAC addresses?

Accepted Answer

Identifying the source and destination of data packets

Answer

Protecting the connection between two devices

Answer

Setting the network connection's bandwidth and speed

Question 37

Which error correction technique involves requesting the receiver to retransmit lost data packets?

Accepted Answer

Retransmission

Answer

Parity Check

Answer

Checksum

Answer

Forward Error Correction

Question 38

How does the preamble in an Ethernet frame contribute to reliable data transmission? Explain its role in frame synchronization.

Accepted Answer

The preamble synchronizes the clocks of the transmitting and receiving devices, ensuring aligned frame transmission and reception.

Answer

The preamble contains the destination device's MAC address, directing the frame to the intended recipient.

Answer

The preamble helps detect errors that may occur during frame transmission.

Answer

The preamble specifies the frame's length, allowing the receiving device to interpret the incoming data correctly.

Question 39

Which of the following is NOT a function of the Data Link Layer?

Accepted Answer

High-level error control

Answer

Flow control

Answer

MAC addressing

Answer

Error detection

Question 40

What is the primary purpose of a MAC address?

Accepted Answer

To uniquely identify a network interface

Answer

To provide wireless connectivity

Answer

To store data

Answer

To route data packets

Question 41

Which Ethernet technology is characterized by a data rate of 10 Gbps?

Accepted Answer

10GBASE-SR

Answer

10BASE-T

Answer

100BASE-FX

Answer

1000BASE-LX

Question 42

What is the main function of a bridge in a network?

Accepted Answer

Connecting multiple LAN segments

Answer

Routing data packets

Answer

Providing wireless connectivity

Answer

Amplifying signals

Question 43

Which advantage do switches offer over hubs in a network?

Accepted Answer

Enhanced performance by reducing collisions

Answer

Increased security

Answer

Lower latency

Question 44

What table in a switch stores MAC addresses and their associated ports?

Accepted Answer

MAC address table

Answer

ARP table

Answer

Routing table

Answer

IP address table

Question 45

Which MAC address type is used to send data to all devices on a network?

Accepted Answer

Broadcast

Answer

Multicast

Answer

Unicast

Answer

Wildcard

Question 46

Which data communication technique helps prevent network congestion by regulating the flow of data?

Accepted Answer

Flow control

Answer

MAC addressing

Answer

Error correction

Answer

Error detection

Question 47

Which of the following is **NOT** a function of the Data Link Layer?

Accepted Answer

Data routing

Answer

Flow control

Answer

MAC addressing

Answer

Error correction

Question 48

Which error detection technique involves adding an extra bit to the end of each data frame, indicating whether the number of 1 bits in the frame is even or odd?

Accepted Answer

Parity bit

Answer

CRC

Answer

Hamming code

Answer

Checksum

Question 49

What is the primary function of a MAC address?

Accepted Answer

Uniquely identifying devices on a network

Answer

Transmitting data over long distances

Answer

Providing security to data

Answer

Checking for transmission errors

Question 50

Which Ethernet standard supports a speed of 100 Gigabit per second?

Accepted Answer

100GBASE-SR4

Answer

1000BASE-T

Answer

10GBASE-LR

Answer

100BASE-TX

Question 51

What is the primary purpose of a bridge in a network?

Accepted Answer

Connecting two or more LAN segments to extend the network

Answer

Amplifying signals over long distances

Answer

Providing routing functionality

Answer

Detecting and correcting transmission errors

Question 52

Which of the following is **NOT** a type of switch?

Accepted Answer

Hub switch

Answer

Virtual LAN switch

Answer

Layer 2 switch

Answer

Layer 3 switch

Question 53

What is the key difference between full-duplex and half-duplex Ethernet?

Accepted Answer

Full-duplex allows simultaneous transmission and reception, while half-duplex allows only one at a time.

Answer

Full-duplex uses 100 Mbps, while half-duplex uses 10 Mbps.

Answer

Full-duplex has a higher collision rate than half-duplex.

Question 54

Which of the following is a benefit of using VLANs?

Accepted Answer

Improved network segmentation and security

Answer

Reduced latency

Answer

Increased network bandwidth

Answer

Simplified network management

Question 55

What is the purpose of the Address Resolution Protocol (ARP)?

Accepted Answer

To map IP addresses to MAC addresses

Answer

To route data packets to their destination

Answer

To check for transmission errors

Answer

To provide network security

Question 56

Which of the following is a challenge associated with the Data Link Layer?

Accepted Answer

Dealing effectively with diverse network topologies, media types, and reliability issues

Answer

Security vulnerabilities

Answer

High bandwidth requirements