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UT/EWI - Network Systems 2024: 13:33 Quiz

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Questions and Answers

What is the purpose of 'slow start' in congestion control mechanisms?

To quickly ramp up the connection speed at the start (correct)
To keep data flowing in case of a single packet loss
To measure delay and detect congestion
To steer the congestion window using a third-power polynomial

What is the significance of 'triple duplicate ack' in congestion control?

It uses a third-power polynomial to steer the congestion window
It quickly ramps up the connection speed at the start
It helps detect congestion by measuring delay
It prevents data flow interruption due to single packet loss (correct)

In congestion control mechanisms, what does the 'TCP Friendly' formula calculate?

Third-power polynomial for congestion window
Packet loss standards
Delay to detect congestion
Resulting connection speed (correct)

What is the main focus of congestion control?

Balancing network resources (B) Signup and view all the answers

What does 'TCP Friendly' formula aim to calculate?

Resulting speed of the connection (D) Signup and view all the answers

Which technique is used to quickly ramp up data transfer at the start of a connection?

'Slow start' (D) Signup and view all the answers

What purpose does 'Triple duplicate ack' serve in congestion control?

Improve data flow after a single packet loss (C) Signup and view all the answers

In congestion control, 'Vegas' measures delay to detect what?

Congestion window size (B) Signup and view all the answers

What is the primary goal of the 'Cubic' alternative approach in congestion control?

Maintain fairness in network resource allocation (B) Signup and view all the answers

What action does TCP Vegas (and others) take when the queue length increases?

Stop sending packets (D) Signup and view all the answers

What does TCP Vegas do upon receiving a triple duplicate acknowledgment?

Reduce window size by 30% (B) Signup and view all the answers

How does TCP Vegas calculate the window size in response to a triple duplicate acknowledgment?

$0.4 \cdot (t - K)^3 + Wmax$ (B) Signup and view all the answers

What does TCP Cubic do in response to triple duplicate acknowledgments?

Reduce window size by 30% (C) Signup and view all the answers

If the window size in TCP Vegas is less than the standard TCP at a given time, what action does TCP Vegas take?

Switch to standard TCP mode (A) Signup and view all the answers

What does TCP do when it detects an increase in the measured Round-Trip Time (RTT)?

Reduce the window size (B) Signup and view all the answers

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