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单选题Which of the following does an astronomical time clock do？（）A Determines the ambient light at night with a photocell.B Calculates sunset and sunrise times based on geographical area.C Determines the start and end of each of the seasons.D Synchronizes t

题目
单选题
Which of the following does an astronomical time clock do？（）
A

Determines the ambient light at night with a photocell.

B

Calculates sunset and sunrise times based on geographical area.

C

Determines the start and end of each of the seasons.

D

Synchronizes the local time displayed with the official world time.

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相似问题和答案

第1题：

What protection method is used in 4F BLSR networks?()

A. Each fiber has half of its SONET capacity reserved for protection.

B. Two fibers in the span carry working traffic, while the other two fibers in the span are reserved for protection.

C. The signal is sent simultaneously in both directions around the ring. The receiver determines which fiber to listen to based on signal quality.

D. The signal is sent simultaneously in both directions around the ring. The transmitter determines which fiber has the working bit set for the receiver to acknowledge.


参考答案：B

第2题：

Part of the job as a network administrator is being able to make a distinction between routed protocols and routing protocols. Which of the following statements is true regarding them?()

A. A routing protocol is assigned to an interface and determines the method of packet delivery.

B. A routed protocol is assigned to an interface and determines the method of packet delivery.

C. A routing protocol determines the path of a packet through a network.

D. A routed protocol determines the path of a packet through a network.

E. A routing protocol operates at the transport layer of the OSI model.

F. A routed protocol updates the routing table of a router.


参考答案：B, C

第3题：

Object-oriented analysis (OOA) is a semiformal specification technique for the object-oriented paradigm. Object-oriented analysis consists of three steps. The first step is(71) . It determines how the various results are computed by the product and presents this information in the form. of a(72) and associated scenarios. The second is(73) , which determines the classes and their attributes, then determines the interrelationships and interaction among the classes. The last step is(74) , which determines the actions performed by or to each class or subclass and presents this information in the form. of (75) .

A．static modeling

B．dynamic modeling

C．use-case modeling

D．behavioral modeling


正确答案：C

第4题：

By default, which of the following factors determines the spanning-tree path cost?（）

  • A、It is the individual link cost based on latency
  • B、It is the sum of the costs based on bandwidth
  • C、It is the total hop count
  • D、It is dynamically determined based on load

正确答案:B

第5题：

According to the Rules, when should lights be displayed?______.

A.During the hours of darkness

B.At all times when underway

C.From sunset to sunrise and restricted visibility

D.Sunrise to sunset


正确答案：C
根据规则，号灯应在什么时候被显示？从日落到日出和能见度受限时

第6题：

Which of the following statements regarding routed and routing protocols are true?()

A. A routed protocol is assigned to an interface and determines the method of packet deliver.

B. A routing protocol determines the path of a packet through a network.

C. A routed protocol determines the path of a packet through a network.

D. A routing protocol operates at the transport layer of the OSI model.

E. A routed protocol updates the routing table of a router.


参考答案：A, B

第7题：

The main factor which determines the output of each cylinder is _____.

A.the cylinder weight

B.the cylinder bore

C.the cylinder length

D.the cylinder cover


正确答案：B

第8题：

By default, which of the following factors determines the spanning-tree path cost?

A．It is the individual link cost based on latency

B．It is the sum of the costs based on bandwidth

C．It is the total hop count

D．It is dynamically determined based on load

E．None of the above


正确答案：B
解析：Explanation:"TheSTPcostisanaccumulatedtotalpathcostbasedontheavailablebandwidthofeachofthelinks."Note:Apathcostvalueisgiventoeachport.Thecostistypicallybasedonaguidelineestablishedaspartof802.1d.Accordingtotheoriginalspecification,costis1,000Mbps(1gigabitpersecond)dividedbythebandwidthofthesegmentconnectedtotheport.Therefore,a10Mbpsconnectionwouldhaveacostof(1,000/10)100.Tocompensateforthespeedofnetworksincreasingbeyondthegigabitrange,thestandardcosthasbeenslightlymodified.Thenewcostvaluesare:Youshouldalsonotethatthepathcostcanbeanarbitraryvalueassignedbythenetworkadministrator,insteadofoneofthestandardcostvalues.IncorrectAnswers:A,D:TheSTPprocessdoesnottakeintoaccountthelatencyorloadofalink.STPdoesnotrecalculatethelinkcostsdynamically.C.HopcountsareusedbyRIProuterstocalculatethecostofaroutetoadestination.TheSTPprocessresidesatlayer2oftheOSImodel,wherehopcountsarenotconsidered.

第9题：

Which of the following determines if the alarm should sound or an entry delay should start？（）

  • A、The sensor itself
  • B、The way the zones are wired
  • C、The zone type
  • D、The digital dialer

正确答案:C

第10题：

What protection method is used in 4F MS-SPRing networks？（）

  • A、 Each fiber has half of its capacity reserved for protection.
  • B、 Two fibers carry their full capacities while the other two fibers are reserved for protection.
  • C、 The signal is sent simultaneously in both directions around the ring. The receiver determines which fiber to listen to based on signal quality.
  • D、 The signal is sent simultaneously in both directions around the ring. The transmitter determines which fiber has the working bit set for the receiver to acknowledge.

正确答案:B

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