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[主观题]

About congestion control, which of the following is wrong?()

A.Traditional packet loss policy is tail-drop. When length of a queue reaches a maximum value, all new packets will be dropped.

B.In RED algorithm, each queue is set a pair of low and high limit values. When length of the queue is lower than the low limit, packets will not be droppeD.When the length exceeds the high limit, all packets will be droppeD.When the length is between low limit and high limit, packets will be dropped randomly.

C.Random number generated by WRED is based on priority. It introduces IP priority differentiated drop policy, so probability of dropping packets with high priority is small.

D.Currently, default congestion control for PTN device is Tail-Drop.

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更多“About congestion control, which of the following is wrong?()”相关的问题

第1题

The cell walls of red and white blood cells are semi-permeable mem- branes.The con
The cell walls of red and white blood cells are semi-permeable mem-branes.The con

The cell walls of red and white blood cells are

semi-permeable mem-branes.The concentration of solute particles in the blood is about

0.60mol·L-1.What hap-pens to blood cells that are placed in pure water?

What happens when it in a1mol·L-1so-dium chloride solution?

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第2题

A.She'll be able to go aboard a spacecraft.B.She'll be able to operate the Mission Con

A.She'll be able to go aboard a spacecraft.

B.She'll be able to operate the Mission Control.

C.She'll be able to receive messages from satellites.

D.She'll be able to learn something new about space.

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第3题

听力原文:A new school year has begun in America. But some children do not go to school. In

听力原文: A new school year has begun in America. But some children do not go to school. Instead, they learn at home, usually with parents as teachers. Educational companies, libraries, school systems and the internet provide families with teaching material. Homeschooling is increasingly popular. Homeschooling groups estimate that two-million children, around two percent, learned at home in 1985. The government estimate was 2.5 million in 2001. Some parents choose homeschooling because of their religious beliefs. Others say it provides more time for the family to be together. Many parents also believe homeschooling avoids problems of a lot of traditional schools. One problem is classes with too many students.

Critics say children need to attend school with other children to help them learn things like social skills. They also say that me homeschooled children do not get a very good education.

All fifty states and the District of Columbia permit homeachcoling. Some, however, require more preparation of parents. Homeschooling is as old as the country. In farm areas, people often lived far from a school. So their parents had to teach them at home. In 1852, there were about 50,000 children studying at home, so the state of Massachusetts passed the first law to require all children to attend school and limited support was given to children in the farm areas.

(30)

A.Homeshcooling can provide more time for the families to get together.

B.Homeschooling solves the problem of congestion (用挤) in one class.

C.Homeschooling has a lot of organizations to provide teaching materials.

D.Parents have their own religious beliefs.

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第4题

Partial decentralization may ______ .A.eventually solve the problem of city congestionB.re

Partial decentralization may ______ .

A.eventually solve the problem of city congestion

B.relieve the strain on the city facilities

C.decrease the land value in the town center

D.bring the same problem of congestion to the suburban areas

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第5题

Which of the following functions does our PTN’s QoS support?()

A.packet classificatio

B.congestion management

C.congestion avoidance

D.traffic monitoring and traffic shaping

E.physical interface total rate limit

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第6题

Partial decentralization may ______.A.eventually solve the problem of city congestionB.rel

Partial decentralization may ______.

A.eventually solve the problem of city congestion

B.relieve the strain on the city facilities

C.decrease the land value in the town center

D.bring the same problem of congestion to the suburban areas

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第7题

In order to prevent SDCCH congestion due to many cross-LAC cell selections, the()param

A. T3212

B.Cell_Reselect_hysteresis

C.Cell_Reselect_Offset

D.Rexlev_Access_Min

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第8题

Attempts to restrict parking in the city center have further _________ the problem of traf
fic congestion, and sometimes the traffic comes to a complete stop in some places.

A.degraded

B.aggravated

C.amplified

D.diffused

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第9题

During network congestion, PTN devices provide QoS bandwidth for high advanced servic
e type by different queue scheduling policies. Currently, PTN devices adopt two scheduling modes simultaneously, which are()and().

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第10题

A.Car owners will be encouraged to show off their wealth.B.The gap between the rich and

A.Car owners will be encouraged to show off their wealth.

B.The gap between the rich and the poor will be bridged.

C.Pollution and traffic congestion will be reduced.

D.People will have to stand still waiting for taxies.

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第11题

What does Grade of Service (GoS) mean?()

A.Number of available subscriber services

B.Number of successful call set-ups

C.Channel utilization

D.Number of unsuccessful call set-ups due to congestion

E.Number of dropped calls

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