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Data Link Layer Quiz - OSI Model

1.

Which layer is the Data Link Layer in the OSI model?

Second layer of OSI model

First layer

Third layer

Fourth layer

The Data Link Layer is the second layer of the OSI model.

2.

What is the Protocol Data Unit (PDU) of the Data Link Layer?

Frames

Bits

Packets

Segments

The PDU of the Data Link Layer is a frame.

3.

Which device primarily operates at the Data Link Layer?

Switch

Hub

Router

Firewall

Switches operate at the Data Link Layer to forward frames based on MAC addresses.

4.

What is the maximum frame size of a standard Ethernet frame?

1518 bytes

1500 bytes

2048 bytes

512 bytes

The maximum Ethernet frame size is 1518 bytes including headers and FCS.

5.

What are the two sublayers of the Data Link Layer?

Media Access Control (MAC) and Logical Link Control (LLC)

Network Access Control and LLC

Transport and MAC

Physical and Logical

The Data Link Layer is divided into MAC and LLC sublayers.

6.

What is the primary responsibility of the Data Link Layer?

Ensuring end-to-end validity of data

Routing packets between networks

Encrypting data

Managing sessions

Data Link Layer ensures frames are transmitted without error between devices.

7.

Where is the Data Link Layer located?

Between Physical Layer and Network Layer

Above Transport Layer

Below Physical Layer

Between Transport and Session Layer

The Data Link Layer sits between Physical and Network layers.

8.

What does each frame carry in the Data Link Layer?

IP packets

Bits

Frames

Segments

Frames encapsulate IP packets for transmission over physical media.

9.

Which field in the frame is used for error detection?

Frame Check Sequence (FCS)

Preamble

Payload

Destination MAC

FCS field detects errors in transmitted frames.

10.

What is the payload size range in an Ethernet frame?

46–1500 bytes

7–1518 bytes

64–1518 bytes

1500–2000 bytes

Ethernet frame payload (MTU) ranges from 46 to 1500 bytes.

11.

Which layer provides the physical medium for Data Link Layer frames?

Physical Layer

Network Layer

Transport Layer

Application Layer

Data Link Layer frames are transmitted over the Physical Layer medium.

12.

What unit does the Physical Layer transmit that the Data Link Layer frames encapsulate?

Bits

Frames

Packets

Segments

Frames are converted into bits and transmitted over physical media.

13.

Which types of media can the Data Link Layer frame be transmitted over?

Guided and Unguided Media

Only Wired

Only Wireless

Only Optical

Frames can be sent over wired or wireless media.

14.

Which signals carry the Data Link Layer frames over the medium?

Electrical and Optical Signals

Radio only

Magnetic only

Logical Signals only

Physical Layer converts frames into electrical or optical signals for transmission.

15.

Which device interprets frames and forwards them within a LAN?

Switch

Router

Hub

Gateway

Switches operate at Data Link Layer to forward frames based on MAC addresses.

Congratulations!

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