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| 1 | |
Which of the following is not a characteristic attributed to a data flow? |
| | A) | Reliability |
| | B) | Delay |
| | C) | Bandwidth |
| | D) | All choices are correct |
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| 2 | |
Which of the following method is used to improve QoS? |
| | A) | Scheduling |
| | B) | Resource reservation |
| | C) | Traffic shaping or policing |
| | D) | All choices are correct |
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| 3 | |
Which of the following method is a scheduling technique? |
| | A) | FIFO queuing |
| | B) | Priority queuing |
| | C) | Weighted-fair queuing |
| | D) | All choices are correct |
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| 4 | |
A _______ algorithm is a policing technique that shapes bursty traffic into fixed-rate traffic by averaging the data rate, but it does not give credit to the user during idle periods. |
| | A) | leaky bucket |
| | B) | token bucket |
| | C) | priority queuing |
| | D) | weighted-fair queuing |
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| 5 | |
A _______algorithm is a policing technique that allows bursty traffic at a regulated maximum rate and give some credits to the user during idle periods. |
| | A) | leaky bucket |
| | B) | token bucket |
| | C) | priority queuing |
| | D) | weighted-fair queuing |
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| 6 | |
Which QoS model depends heavily on resource reservation? |
| | A) | IntServ |
| | B) | DiffServ |
| | C) | Scheduling |
| | D) | Policing |
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| 7 | |
Integrated Services is a _______________ QoS model designed for IP. |
| | A) | flow-based |
| | B) | class-based |
| | C) | reliability-based |
| | D) | efficiency-based |
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| 8 | |
Differentiated Services is a _______________ QoS model designed for IP. |
| | A) | flow-based |
| | B) | class-based |
| | C) | reliability-based |
| | D) | efficiency-based |
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| 9 | |
Guaranteed services in IntServ model are required for __________application. |
| | A) | on-demand audio/video |
| | B) | stored audio/video |
| | C) | real-time |
| | D) | All choices are correct |
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| 10 | |
Controlled-Load services in IntServ model are designed for applications that ______________________. |
| | A) | can accept some delays, but are sensitive to packet loss |
| | B) | can accept some packet loss, but are sensitive to delay |
| | C) | are sensitive to both delay and packet loss |
| | D) | are sensitive to neither delay nor packet loss |
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| 11 | |
IntServ model is ________________________________________ |
| | A) | scalable but has service type limitation. |
| | B) | scalable and does not have service type limitation. |
| | C) | not scalable and has service type limitation. |
| | D) | not scalable but does not have service type limitation. |
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| 12 | |
To implement _________, the DS node uses _________________ such as meters, markers, shapers, and droppers. |
| | A) | Diffserv; traffic conditioners |
| | B) | Diffserv; gadgets |
| | C) | IntServ; traffic conditioners |
| | D) | IntServ; gadgets |
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| 13 | |
FTP requires a _________ level of reliability. |
| | A) | low |
| | B) | medium |
| | C) | high |
| | D) | None of the choices are correct |
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| 14 | |
Voice over IP requires a _________ level of reliability. |
| | A) | low |
| | B) | medium |
| | C) | high |
| | D) | None of the choices are correct |
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| 15 | |
In priority queuing, when the higher-priority queue is full, the next packet is _________. |
| | A) | sent to the lower priority queue |
| | B) | kept in the higher priority queue |
| | C) | discarded |
| | D) | None of the choices are correct |
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| 16 | |
In weighted-fair queuing, there is _________ starvation. |
| | A) | sometimes |
| | B) | never |
| | C) | always |
| | D) | None of the choices are correct |
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| 17 | |
In the leaky-bucket implementation, we use ____________. |
| | A) | FIFO queuing |
| | B) | priority queuing |
| | C) | weighted-fair queuing |
| | D) | None of the choices are correct |
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| 18 | |
In the token-bucket implementation, we use ____________. |
| | A) | FIFO queuing |
| | B) | priority queuing |
| | C) | weighted-fair queuing |
| | D) | None of the choices are correct |
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| 19 | |
Integrated Services use ____________ class(es) of service. |
| | A) | one |
| | B) | two |
| | C) | three |
| | D) | four. |
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| 20 | |
Integrated Services use ____________ messages. |
| | A) | path |
| | B) | reservation |
| | C) | neither path nor reservation |
| | D) | both path and reservation |
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