TCP congestion control in Computer Networks - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the sentence to describe the main goal of TCP congestion control.

Computer Networks

TCP congestion control aims to [1] network congestion by adjusting the rate of data transmission.

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Adelay

Bincrease

Cignore

Dreduce

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'increase' because it sounds like improving speed.

Choosing 'ignore' because congestion seems unrelated.

TCP congestion control reduces network congestion by controlling how fast data is sent.

2fill in blank

medium

Complete the sentence to identify the TCP algorithm phase that increases the congestion window size exponentially.

Computer Networks

The [1] phase rapidly increases the congestion window size to probe network capacity.

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Aslow start

Bcongestion avoidance

Cfast recovery

Dtimeout

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing slow start with congestion avoidance.

Choosing fast recovery which happens after packet loss.

The slow start phase increases the congestion window exponentially to quickly find the network capacity.

3fill in blank

hard

Fix the error in the description of TCP congestion control phases.

Computer Networks

After detecting packet loss, TCP enters [1] phase to reduce the congestion window and recover quickly.

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Afast recovery

Bslow start

Ccongestion avoidance

Didle

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing slow start which resets the window too much.

Choosing congestion avoidance which is a steady phase.

Fast recovery is the phase TCP enters after packet loss to reduce congestion window and recover quickly.

4fill in blank

hard

Fill both blanks to complete the formula for updating the congestion window size during congestion avoidance.

Computer Networks

cwnd = cwnd [1] ([2] / cwnd) per acknowledgment received

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A+

B1

C-

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using multiplication instead of addition.

Subtracting instead of adding.

During congestion avoidance, the congestion window increases by 1 full-sized segment per round-trip time, approximated as adding 1/cwnd per ACK.

5fill in blank

hard

Fill all three blanks to complete the description of TCP congestion control response to packet loss.

Computer Networks

On packet loss, TCP sets [1] to half of its current value, resets [2] to 1, and enters [3] phase.

Drag options to blanks, or click blank then click option'

Assthresh

Bcwnd

Cslow start

Dfast recovery

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing cwnd and ssthresh roles.

Choosing fast recovery instead of slow start after loss.

When packet loss occurs, TCP sets the slow start threshold (ssthresh) to half the congestion window, resets the congestion window (cwnd) to 1, and enters slow start phase to cautiously probe the network.