TCP flow control (sliding window) in Computer Networks - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the sentence to describe the purpose of TCP flow control.

Computer Networks

TCP flow control uses a [1] to manage the amount of data sent before receiving an acknowledgment.

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Achecksum

Brouting table

Csliding window

DIP address

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing flow control with error checking methods like checksum.

Thinking routing tables are involved in flow control.

TCP flow control uses a sliding window to control how much data can be sent before waiting for an acknowledgment from the receiver.

2fill in blank

medium

Complete the sentence to explain what the window size represents in TCP flow control.

Computer Networks

The window size in TCP flow control represents the [1] of data the sender can transmit without waiting for an acknowledgment.

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Amaximum amount

Bminimum amount

Caverage amount

Dtotal amount

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing maximum with minimum or average.

Thinking the window size is the total data to be sent.

The window size is the maximum amount of data the sender can send before needing an acknowledgment, helping to prevent overwhelming the receiver.

3fill in blank

hard

Fix the error in the statement about sliding window movement.

Computer Networks

The sliding window moves forward when the sender receives a [1] from the receiver.

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Anegative acknowledgment

Bpositive acknowledgment

Ctimeout

Dreset signal

Attempts:

3 left

💡 Hint

Common Mistakes

Thinking the window moves on timeout or negative acknowledgment.

Confusing reset signals with acknowledgments.

The sliding window advances when the sender receives a positive acknowledgment (ACK), indicating data was received successfully.

4fill in blank

hard

Fill both blanks to complete the explanation of how the sliding window adjusts.

Computer Networks

The sender adjusts the window size based on the [1] value sent by the receiver and [2] network conditions.

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Aadvertised window

Bpacket loss

Ccongestion

Dtimeout

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up advertised window with timeout or packet loss.

Ignoring network congestion effects.

The sender uses the advertised window size from the receiver and considers network congestion to adjust the sliding window for efficient flow control.

5fill in blank

hard

Fill all three blanks to complete the dictionary comprehension representing TCP window updates.

Computer Networks

window_updates = [1]: [2] for [3] in packets if packets[[3]] > 0

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Aseq_num

Bwindow_size

Dpacket

Attempts:

3 left

💡 Hint

Common Mistakes

Using packet as key instead of sequence number.

Not filtering packets with positive size.

This comprehension creates a dictionary where each sequence number (seq_num) maps to its window size, including only packets with positive size.