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OTDR（Optical Time Domain Reflectometer，光时域反射仪）的主要作用包括（）。
- A、测量光纤长度
- B、光纤故障点
- C、光纤衰耗
- D、光纤接头损耗
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更多 “OTDR（Optical Time Domain Reflectometer，光时域反射仪）的主要作用包括（）。A、测量光纤长度B、光纤故障点C、光纤衰耗D、光纤接头损耗” 相关考题
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一个RB由若干个RE组成，频域宽度为『____』kHz，时间长度为『____』ms。(A RB is composed of several RE , and it's width is『____』kHz in the frequency domain , the length is『____』ms in the time domain. )
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Which of the following network protocols is used to ensure consistent time across network devices on the domain?()
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What three in combination are factors that can cause four－wave mixing in fiber－optic cables? ()(Choose three.)
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What three in combination are factors that can cause four-wave mixing in fiber-optic cables? （）(Choose three.)A、low optical powerB、high optical powerC、few optical channelsD、many optical channelsE、low chromatic dispersionF、high chromatic dispersionG、too much power differential in the optical channels
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A large corporation is concerned about the amount of time it takes to back up their main file server. They are also concerned that their IT technician frequently forgets to change the backup tapes， thereby leaving the company open to data loss. Which backup system would solve both problems？（）A、 RAIDB、 tape libraryC、 optical storageD、 disk to disk to tape
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Which two statements are true about optical networks?（）A、SONET and SDH both use time-division multiplexing.B、An optical transport network system uses time-division multiplexing.C、SONET and SDH both use wavelength-division multiplexing.D、An optical transport network system uses wavelength-division multiplexing.
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A corrupted file system is now repaired and back in use. Some， but not all of the files within the file systems have been deleted. The only backup of this file system is a month-old tar archive. This archive will need to be restored as root. Which two statements correctly describe the effects of the restore operation？（）A、 Files found in the file system that are also on tape will NOT be overwritten.B、 The missing files， present on the backup tape， are restored to the file system with the data as it was when the backup was taken.C、 The access times are preserved by tar and will reflect the time when a user last accessed the data.D、 The modification time on the files restored by tar will be preserved and will reflect the time the file was last modified before the backup， NOT the time of the restore operation.
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无源光网络由哪些部分构成？（）A、OLT（Optical Line Terminal）－光线路终端B、ONU（Optical NetworkUnit）－光网络单元C、ONT（Optical Network Terminal）－光网络终端D、ODN（Optical Distribution Network）－光分配网
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Jill, a technician, is installing several PCs in a home that is pre-wired with Ethernet to seven rooms. In the wiring closet all the Ethernet cables are hanging free and are not labeled. Which of the following tools would the technician use to locate the cable that runs to each room?（）A、Extension magnetB、Toner probeC、MultimeterD、Optical Time Domain Reflectometer (OTDR)
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A Windows OS has failed to load after a successful power on self test. Which of the following steps will help troubleshoot the problem?（）A、Change the time and date in the BIOS.B、Replace the keyboard.C、Check for media in the optical drive.D、Add more RAM.
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A computer is failing to boot. Which of the following tools would be used FIRST in troubleshooting? （）A、Time Domain Reflectometer (TDR)B、OscilloscopeC、Power supply testerD、Spectrum analyzer
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Which of the following network protocols is used to ensure consistent time across network devices on the domain?（）A、NTPB、FTPC、RTPD、IGMP
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Your company has an Active Directory domain. The company has a main office and a branch office. Both the offices have domain controllers that run Active Directory-integrated DNS zones. All client computers are configured to use the local domain controllers for DNS resolution. The domain controllers at the branch office location are configured as Read-Only Domain Controllers （RODC）. You change the IP address of an exisiting server named SRV2 in the main office. You need the branch office DNS servers to reflect the change immediately. What should you do？（） A、 Run the dnscmd /ZoneUpdateFromDs command on the branch office servers.B、 Run the dnscmd /ZoneUpdateFromDs command on a domain controller in the main office.C、 Change the domain controllers at the branch offices from RODCs to standard domain controllers.D、 Decrease the Minimum （default） TTL option to 15 minutes on the Start of Authority （SOA） record for thezone.
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Your network consists of a single Active Directory domain that contains two domain controllers. Both domain controllers run Windows Server 2003 Service Pack 2 (SP2). Auditing of successful account logon events is enabled on all computers in the domain. You need to identify the last time a specific user logged on to the domain. What should you do? （）A、Examine the System Event Log on the user’s computer.B、Examine the System Event Log on both domain controllers.C、Examine the Security Event Log on both domain controllers.D、Examine the Application Event Log on the user’s computer.
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WDM与（）本质是相同的。A、OFDM(optical frequency division multiplexing)B、OTDM(optical time division multiplexing)C、CDM(code division multiplexing)D、EDFA(erbium doped fiber amplifier)
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多选题A corrupted file system is now repaired and back in use. Some， but not all of the files within the file systems have been deleted. The only backup of this file system is a month-old tar archive. This archive will need to be restored as root. Which two statements correctly describe the effects of the restore operation？（）AFiles found in the file system that are also on tape will NOT be overwritten.BThe missing files， present on the backup tape， are restored to the file system with the data as it was when the backup was taken.CThe access times are preserved by tar and will reflect the time when a user last accessed the data.DThe modification time on the files restored by tar will be preserved and will reflect the time the file was last modified before the backup， NOT the time of the restore operation.
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单选题Your network consists of a single Active Directory domain. The domain controllers run Windows Server 2008 R2. Your companyˉs enterprisesecurity policy states that the domain controllers cannot contain optical drives. ou need to recommend a backup and recovery plan that restores the domain controllers in the event of a catastrophic server failure. What should you recommend？（）A
Use Windows Server Backup to back up each domain controller to a local disk. Create a Windows recovery Environment （Windows RE） partition on each domain controller.B
Use Windows Server Backup to back up each domain controller to a local disk. Use Windows deployment Services （WDS） to deploy the Windows Recovery Environment （Windows RE）.C
Use Windows Server Backup to back up each domain controller to a remote network share. Create a windows Recovery Environment （Windows RE） partition on each domain controller.D
Use Windows Server Backup to back up each domain controller to a remote network share. Use windows Deployment Services（WDS）to deploy the Windows Recovery Environment （Windows RE）.
考题
单选题Your network consists of a single Active Directory domain that contains two domain controllers. Both domain controllers run Windows Server 2003 Service Pack 2 (SP2). Auditing of successful account logon events is enabled on all computers in the domain. You need to identify the last time a specific user logged on to the domain. What should you do?（）A
Examine the System Event Log on the user’s computer.B
Examine the System Event Log on both domain controllers.C
Examine the Security Event Log on both domain controllers.D
Examine the Application Event Log on the user’s computer.
考题
多选题What three in combination are factors that can cause four-wave mixing in fiber-optic cables？（）Alow optical poweBhigh optical powerCfew optical channelsDmany optical channelsElow chromatic dispersionFhigh chromatic dispersionGtoo much power differential in the optical channels
考题
单选题Your company has two Active Directory Domain Services （AD DS） domains， Domain1 and Domain2. A two-way trust relationship exists between the domains. Users in both domains can log on to client computers in only their own domains. System logs on the domain controllers display the error message "Clock skew too great" when users in Domain1 attempt to log on to client computers in Domain2. You need to ensure that users can log on to client computers in both domains. What should you do？（）A
Run a startup script that includes Net Time /querysntp on all client computers.B
Run a startup script that includes Net Time /setsntp on all client computers.C
Configure the primary domain controller （PDC） emulator in each domain to synchronize its clock with the same external time source.D
Decrease the Maximum tolerance for computer clock synchronization setting in the default Domain Group Policy object （GPO）.
考题
单选题Jill, a technician, is installing several PCs in a home that is pre-wired with Ethernet to seven rooms. In the wiring closet all the Ethernet cables are hanging free and are not labeled. Which of the following tools would the technician use to locate the cable that runs to each room?（）A
Extension magnetB
Toner probeC
MultimeterD
Optical Time Domain Reflectometer (OTDR)
考题
多选题Which two statements are true about optical networks?（）ASONET and SDH both use time-division multiplexing.BAn optical transport network system uses time-division multiplexing.CSONET and SDH both use wavelength-division multiplexing.DAn optical transport network system uses wavelength-division multiplexing.
考题
多选题What three in combination are factors that can cause four-wave mixing in fiber-optic cables? （）(Choose three.)Alow optical powerBhigh optical powerCfew optical channelsDmany optical channelsElow chromatic dispersionFhigh chromatic dispersionGtoo much power differential in the optical channels
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