CSMA/CA protocol in Computer Networks - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to identify the main purpose of CSMA/CA protocol.

Computer Networks

CSMA/CA is used to [1] collisions in wireless networks.

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Adetect

Bincrease

Cignore

Davoid

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing collision avoidance with collision detection.

Thinking CSMA/CA increases collisions.

CSMA/CA stands for Carrier Sense Multiple Access with Collision Avoidance. It is designed to avoid collisions before they happen in wireless networks.

2fill in blank

medium

Complete the code to describe the first step a device takes before sending data in CSMA/CA.

Computer Networks

Before sending data, a device listens to the channel to check if it is [1].

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Afree

Bbusy

Cdamaged

Dencrypted

Attempts:

3 left

💡 Hint

Common Mistakes

Assuming the device sends data even if the channel is busy.

Confusing 'free' with 'busy' channel state.

In CSMA/CA, a device first senses the channel to see if it is free before transmitting to avoid collisions.

3fill in blank

hard

Fix the error in the description of CSMA/CA's collision handling.

Computer Networks

CSMA/CA detects collisions after they happen and then [1] the data.

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Aretransmits immediately

Bavoids collisions before sending

Cignores collisions

Dsends an error message

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing CSMA/CA with CSMA/CD (which detects collisions).

Thinking CSMA/CA retransmits immediately after collision.

CSMA/CA avoids collisions before sending data by checking the channel and using backoff timers, rather than detecting collisions after they occur.

4fill in blank

hard

Fill both blanks to complete the CSMA/CA backoff process description.

Computer Networks

If the channel is busy, the device waits for a random [1] before checking again, using a [2] algorithm.

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Atime interval

Bfixed delay

Cexponential backoff

Dlinear increase

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing fixed delay instead of random time interval.

Confusing exponential backoff with linear increase.

CSMA/CA uses a random time interval to wait before retrying, and this interval increases exponentially with each attempt to reduce collisions.

5fill in blank

hard

Fill all three blanks to complete the CSMA/CA transmission sequence.

Computer Networks

The device first [1] the channel, then waits for a [2] period if busy, and finally sends a [3] frame to reserve the channel.

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Asenses

Brandom backoff

CRequest to Send (RTS)

Dacknowledges

Attempts:

3 left

💡 Hint

Common Mistakes

Skipping the sensing step.

Confusing RTS with acknowledgment frames.

Using fixed delay instead of random backoff.

In CSMA/CA, the device senses the channel, waits a random backoff if busy, and sends an RTS frame to reserve the channel before actual data transmission.