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Computer Networks » Congestion Control

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Two broad categories of congestion control are

A. Open-loop and closed-loop
B. Open-control and closed-control
C. Active control and passive control
D. Active loop and passive loop

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In open-loop control, policies are applied to __________

A. Remove after congestion occurs
B. Remove after sometime
C. Prevent before congestion occurs
D. Prevent before sending packets

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Retransmission of packets must not be done when _______

A. Packet is lost
B. Packet is corrupted
C. Packet is needed
D. Packet is error-free

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In Go-Back-N window, when the timer of the packet times out, several packets have to be resent even some may have arrived safe. Whereas in Selective Repeat window, the sender resends ___________

A. Packet which are not lost
B. Only those packets which are lost or corrupted
C. Packet from starting
D. All the packets

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Discarding policy is mainly done by _______

A. Sender
B. Receiver
C. Router
D. Switch

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Closed-Loop control mechanisms try to _________

A. Remove after congestion occurs
B. Remove after sometime
C. Prevent before congestion occurs
D. Prevent before sending packets

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The technique in which a congested node stops receiving data from the immediate upstream node or nodes is called as _______

A. Admission policy
B. Backpressure
C. Forward signaling
D. Backward signaling

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Backpressure technique can be applied only to _______

A. Congestion networks
B. Closed circuit networks
C. Open circuit networks
D. Virtual circuit networks

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The packet sent by a node to the source to inform it of congestion is called _______

A. Explicit
B. Discard
C. Choke
D. Backpressure

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In the slow-start algorithm, the size of the congestion window increases __________ until it reaches a threshold.

A. Exponentially
B. Additively
C. Multiplicatively
D. Suddenly

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