Congestion Control and Quality of Service Questions

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11.

Congestion in a network or internetwork occurs because routers and switches have _______.

A

tables

B

queues

C

crosspoints

D

none of the above

Correct Answer: B

None.

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12.

In a network, when the load is much less than the capacity of the network, the delay is _________

A

at a maximum

B

at a minimum

C

constant

D

none of the above

Correct Answer: B

None.

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13.

In a network, when the load reaches the network capacity, the delay _______

A

increases sharply

B

decreases sharply

C

remains constant

D

cannot be predicted

Correct Answer: A

None.

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14.

In a network, when the load is below the capacity of the network, the throughput ______________

A

increases sharply

B

increases proportionally with the load

C

declines sharply

D

declines proportionally with the load

Correct Answer: B

None.

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15.

In a network, after the load reaches the capacity, throughput _______

A

increases sharply

B

increases proportionally with the load

C

declines sharply

D

declines proportionally with the load

Correct Answer: C

None.

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16.

In ________ congestion control, policies are applied to prevent congestion before it happens

A

open-loop

B

closed-loop

C

either (a) or (b)

D

neither (a) nor (b)

Correct Answer: A

None.

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17.

In _______ congestion control, mechanisms are used to alleviate congestion after it happens

A

open-loop

B

closed-loop

C

either (a) or (b)

D

neither (a) nor (b)

Correct Answer: B

None.

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18.

The technique of ________refers to a congestion control mechanism in which a congested node stops receiving data from the immediate upstream node or nodes

A

backpressure

B

choke packet

C

implicit signaling

D

explicit signaling

Correct Answer: A

None.

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19.

A ___________ is a packet sent by a node to the source to inform it of congestion

A

backpressure

B

choke packet

C

implicit signaling

D

explicit signaling

Correct Answer: B

None.

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20.

. In __________, there is no communication between the congested node or nodes and the source. The source guesses that there is a congestion somewhere in the network from other symptoms

A

backpressure

B

choke packet

C

implicit signaling

D

explicit signaling

Correct Answer: C

None.

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