SONET and SDH both use time-division multiplexing.
An optical transport network system uses time-division multiplexing.
SONET and SDH both use wavelength-division multiplexing.
An optical transport network system uses wavelength-division multiplexing.
第1题：
A. optical technology for transmitting up to 32 channels over multiple fiber strands
B. optical technology for transmitting up to 16 channels over multiple fiber strands
C. a WDM system that is compatible with EDFA technology
D. a technology for transmitting more closely packed optical signals using more sophisticated transceiver designs than CWDM .
第2题：
Dense Wavelength Division Multiplexing (DWDM) is an important innovation in optical networks.Which two descriptions best define DWDM?（）
第3题：
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
第4题：
无源光网络由哪些部分构成？（）
第5题：
Your network contains a server that runs Windows Server 2008 R2. You need to schedule backups of the server. The solution must ensure that multiple versions of the backup are available. Which two possible backup locations should you use？（）
第6题：
You are the network consultant from passguide.com. You have been asked for which two features of optical networks allow data to be transmitted over extremely long distances? （）
第7题：
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？（）
第8题：
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.
第9题：
Which statement is true about Kompella-based and Martina-based VPNs？（）
第10题：
What two descriptions best define DWDM？ （）