AQA A’Level SLR21 CSMA/CS and RTS/CTS Quiz

What does CSMA/CA stand for?

• Carrier Sense Multiple Access with Collision Avoidance

• Clear to Send with Request to Send

• Random Access with Collision Detection

• Collision Sensing Multiple Access with Carrier Avoidance

Answer explanation

CSMA/CA stands for Carrier Sense Multiple Access with Collision Avoidance. It is a protocol used in network communication to avoid collisions and ensure efficient data transmission.

What is the purpose of Request to Send/Clear to Send (RTS/CTS) in wireless protocols?

• To encrypt the data being transmitted

• To reduce the range of the wireless signal

• To increase the data transfer speed

• To avoid collisions in data transmission

Answer explanation

RTS/CTS is used to avoid collisions in data transmission.

The wireless protocol that uses Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) is (a)   .

Answer explanation

Wi-Fi uses Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) to avoid collisions and ensure efficient wireless communication.

What is the purpose of the Clear to Send (CTS) signal in RTS/CTS protocol?

• To acknowledge the receipt of data

• To request permission for data transmission

• To detect collisions in the data transmission

• To indicate that the channel is clear for data transmission

Answer explanation

The Clear to Send (CTS) signal in RTS/CTS protocol indicates that the channel is clear for data transmission.

In CSMA/CA, what does the 'Collision Avoidance' part of the protocol aim to prevent?

• Interference from other devices

• Data loss during transmission

• Simultaneous data transmission from multiple devices

• Physical damage to the wireless devices

Answer explanation

The 'Collision Avoidance' part of CSMA/CA aims to prevent simultaneous data transmission from multiple devices, ensuring efficient and reliable communication.

Which of the following is NOT a feature of CSMA/CA protocol?

• Random backoff time after a collision

• Exponential increase in backoff time after repeated collisions

• Acknowledgment of successful data transmission

• Continuous data transmission without checking the channel

Answer explanation

Continuous data transmission without checking the channel is NOT a feature of CSMA/CA protocol.

What is the purpose of the Request to Send (RTS) signal in RTS/CTS protocol?

• To indicate that the channel is clear for data transmission

• To request permission for data transmission

• To acknowledge the receipt of data

• To detect collisions in the data transmission

Answer explanation

The purpose of the RTS signal in RTS/CTS protocol is to request permission for data transmission.

Which wireless protocol uses Request to Send/Clear to Send (RTS/CTS) in its communication?

• Bluetooth

• Wi-Fi

• NFC

• Zigbee

Answer explanation

Wi-Fi uses Request to Send/Clear to Send (RTS/CTS) in its communication.

What is the main advantage of using RTS/CTS in wireless communication?

• Increased data transfer speed

• Reduced power consumption

• Reduced chances of data collisions

• Improved security of data transmission

Answer explanation

RTS/CTS reduces data collisions, ensuring smoother wireless communication.

In CSMA/CA, what does the 'Carrier Sense' part of the protocol refer to?

• Detecting the presence of other devices on the channel

• Ensuring the availability of the wireless signal

• Preventing interference from other devices

• Checking the integrity of the data being transmitted

Answer explanation

The 'Carrier Sense' part of CSMA/CA refers to detecting the presence of other devices on the channel. This ensures efficient communication and avoids collisions.