Computer Networks Assignment-3

What is the basic principle of the ALOHA protocol?

• The ALOHA protocol is designed for point-to-point communication only.

• The ALOHA protocol requires a fixed time slot for communication.

• The basic principle of the ALOHA protocol is random access to the communication medium.

• The ALOHA protocol uses a token-based access method.

Explain the difference between pure ALOHA and slotted ALOHA.

• Slotted ALOHA allows for continuous transmission without restrictions.

• Pure ALOHA uses fixed time slots for transmission.

• Pure ALOHA has a higher throughput than slotted ALOHA.

• Pure ALOHA permits transmission at any time, while slotted ALOHA restricts transmission to specific time slots.

What is the maximum throughput of the ALOHA protocol?

• 18.4% of the channel capacity

• 10% of the channel capacity

• 25% of the channel capacity

• 50% of the channel capacity

Describe the CSMA/CD mechanism and its purpose.

• CSMA/CD is a network protocol that manages access to a shared communication channel and handles collisions in Ethernet networks.

• CSMA/CD is a wireless communication protocol that enhances signal strength.

• CSMA/CD is a method for encrypting data in transit over the internet.

• CSMA/CD is used exclusively in fiber optic networks to prevent data loss.

How does CSMA/CD handle collisions in a network?

• CSMA/CD ignores collisions and continues transmitting.

• CSMA/CD requires all devices to stop transmitting simultaneously.

• CSMA/CD handles collisions by detecting them, stopping transmission, waiting for a random backoff time, and then retransmitting.

• CSMA/CD uses a fixed time delay for all retransmissions.

What are the main differences between CSMA/CD and CSMA/CA?

• CSMA/CD is for wired networks and detects collisions, while CSMA/CA is for wireless networks and avoids collisions.

• CSMA/CD is used for wireless networks and avoids collisions.

• Both CSMA/CD and CSMA/CA are used for wired networks.

• CSMA/CA is for wired networks and detects collisions.

Explain how CSMA/CA attempts to avoid collisions.

• CSMA/CA uses a fixed time slot for transmission.

• CSMA/CA avoids collisions by using a listen-before-talk approach, random backoff times, and RTS/CTS handshaking.

• CSMA/CA allows all devices to transmit simultaneously.

• CSMA/CA relies solely on signal strength to determine collisions.

What role does the backoff algorithm play in CSMA/CD?

• The backoff algorithm eliminates the need for collision detection.

• The backoff algorithm is used to prioritize certain packets over others.

• The backoff algorithm reduces collision chances by introducing a random wait time before retransmission.

• The backoff algorithm increases the speed of data transmission.

Define network efficiency in the context of multiple access protocols.

• Network efficiency is the speed of the network connection.

• Network efficiency measures the latency of data transmission.

• Network efficiency is the ratio of actual throughput to maximum possible throughput in multiple access protocols.

• Network efficiency is the total number of users in a network.

What factors affect the throughput of the ALOHA protocol?

• Network load, collision probability, retransmission strategy, and protocol efficiency.

• Network speed and bandwidth

• User authentication methods

• Packet size and format