What two descriptions best define DWDM？ （）
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：
What three in combination are factors that can cause four-wave mixing in fiber-optic cables？（）
第3题：
A. low optical power
B. high optical power
C. few optical channels
D. many optical channels
E. low chromatic dispersion
F. high chromatic dispersion
G. too much power differential in the optical channels
第4题：
Dense Wavelength Division Multiplexing (DWDM) is an important innovation in optical networks.Which two descriptions best define DWDM?（）
第5题：
Which two statements are correct about the signaling methods that are utilized for transmitting voice？ （）
第6题：
A.It requires the use of ARP.
B.It can support multiple IPv6 subnets on a single link.
C.It supports up to 2 instances of OSPFv3 over a common link.
D.It routes over links rather than over networks.
第7题：
Which two characteristics apply to a CAS T1 interface?（）
第8题：
A. PPPoE
B. DOCSIS
C. CMTS
D. AAL5
第9题：
You are deploying two core switches， one in each building， 50 km away from each other. The cross-connection between them will be a Layer 2 2-gigabit EtherChannel with an 802.1Q trunk. You configured it correctly but the link does not come up. The port is in the "admin up" state， and the line protocol is in the "down" state. The fiber link is OK. What would be the most likely reason for the link not to come up？ （）
第10题：
What three in combination are factors that can cause four-wave mixing in fiber-optic cables? （）(Choose three.)