Exploring the Data Link Layer

What is the purpose of error detection in the data link layer?

• To manage network congestion effectively.

• To encrypt data for secure communication.

• To enhance the speed of data transmission.

• The purpose of error detection in the data link layer is to identify and correct errors in transmitted data frames.

Name two common error detection techniques used in data link protocols.

• Parity Bit and Hamming Code

• Cyclic Redundancy Check (CRC) and Checksum

• Data Encryption and Compression

• Signal Strength and Noise Ratio

Explain the concept of flow control in data link layer communications.

• Flow control is used to increase the speed of data transmission.

• Flow control ensures data is sent in a random order.

• Flow control is a method to regulate data transmission between sender and receiver to prevent overwhelming the receiver.

• Flow control is a method to encrypt data during transmission.

What is the sliding window protocol and how does it work?

• The sliding window protocol is used exclusively for video streaming applications.

• The sliding window protocol is a flow control method that allows multiple packets to be sent before requiring an acknowledgment, improving data transmission efficiency.

• The sliding window protocol is a method for error detection in data transmission.

• The sliding window protocol requires an acknowledgment for each packet sent before sending the next one.

Describe the structure of a MAC address.

• A MAC address is a 32-bit identifier displayed as 8 hexadecimal digits.

• A MAC address is a 64-bit identifier used for network routing.

• A MAC address is a 48-bit identifier, usually displayed as 12 hexadecimal digits, divided into two parts: the first 24 bits for the OUI and the last 24 bits for the device identifier.

• A MAC address consists of 16 bits and is represented in binary format.

What is the significance of MAC addressing in a local area network?

• MAC addressing is used for routing data across the internet.

• MAC addressing is a method for encrypting data in transit.

• MAC addressing uniquely identifies devices in a local area network, ensuring accurate data delivery.

• MAC addresses are only relevant for wireless networks.

List the main components of a data link frame structure.

• Frame Header, Frame Payload, Frame Trailer

• Segment Header, Segment Data, Segment End

• Packet Header, Packet Payload, Packet Trailer

• Frame Header, Frame Body, Frame Footer

What role does the data link layer play in network communication?

• The data link layer facilitates node-to-node communication, error detection, and data framing.

• The data link layer is responsible for application-level protocols.

• The data link layer encrypts data for secure transmission.

• The data link layer manages routing between different networks.

Define link layer security and its importance in networking.

• Link layer security is unnecessary in modern networking environments.

• Link layer security focuses solely on physical hardware protection.

• Link layer security is only relevant for internet connections.

• Link layer security is crucial for protecting data integrity and confidentiality in local networks, preventing unauthorized access and ensuring reliable communication.

What are the differences between controlled and uncontrolled access in multiple access protocols?

• Controlled access is faster than uncontrolled access in all scenarios.

• Uncontrolled access guarantees no collisions will occur during communication.

• Controlled access allows unlimited transmission without any management.

• Controlled access ensures orderly communication through management mechanisms, while uncontrolled access allows free transmission, risking collisions.