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What two descriptions best define DWDM？ （）
- A、 a WDM system that is compatible with EDFA technology
- B、 an optical technology for transmitting up to 16 channels over multiple fiber strands
- C、 an optical technology for transmitting up to 32 channels over multiple fiber strands
- D、 a technology for transmitting multiple optical signals using less sophisticated transceiver designthen CWDM
- E、 a technology for transmitting more closely packed optical signals using more sophisticatedtransceiver designs than CWDM
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更多 “What two descriptions best define DWDM？ （）A、 a WDM system that is compatible with EDFA technologyB、 an optical technology for transmitting up to 16 channels over multiple fiber strandsC、 an optical technology for transmitting up to 32 channels over multiple fiber strandsD、 a technology for transmitting multiple optical signals using less sophisticated transceiver designthen CWDME、 a technology for transmitting more closely packed optical signals using more sophisticatedtransceiver designs than CWDM” 相关考题
考题
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
考题
What is the international standard for transmitting data over a cable sys tem?()
A. PPPoEB. DOCSISC. CMTSD. AAL5
考题
Dense Wavelength Division Multiplexing (DWDM) is an important innovation in optical networks.Which two descriptions best define DWDM?()
A. optical technology for transmitting up to 32 channels over multiple fiber strandsB. optical technology for transmitting up to 16 channels over multiple fiber strandsC. a WDM system that is compatible with EDFA technologyD. a technology for transmitting more closely packed optical signals using more sophisticated transceiver designs than CWDM .
考题
What are two enhancements that OSPFv3 supports over OSPFv2? ()
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.
考题
What three in combination are factors that can cause four-wave mixing in fiber-optic cables？（）A、 low optical poweB、 high optical powerC、 few optical channelsD、 many optical channelsE、 low chromatic dispersionF、 high chromatic dispersionG、 too much power differential in the optical channels
考题
Which two characteristics apply to a CAS T1 interface?（）A、signaling travels in-band B、up to 24 voice channels C、up to 32 voice channels D、signaling travels in time slot 17 E、uses Q.931 signaling protocol in a common channel
考题
Which two statements are correct about the signaling methods that are utilized for transmitting voice？ （）A、 Channel-associated signaling transmits control signals in band and therefore reduces the bandwidth available for the voice data stream.B、 Channel-associated signaling utilizes a separate TDM channel for transmitting control signals.C、 Common channel signaling transmits control signals in band and therefore reduces the bandwidth available for the voice data stream.D、 Common channel signaling uses one of the TDM channels to transmit control information reducing the number of channels available for voice.E、 ISDN BRIs implement channel-associated signaling.
考题
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？ （）A、 The switches are not the same modelB、 You are not using the correct SFPC、 You are not using correct optical media convertersD、 Configuration should be modified， because the distance is longer
考题
Dense Wavelength Division Multiplexing (DWDM) is an important innovation in optical networks.Which two descriptions best define DWDM?（）A、optical technology for transmitting up to 32 channels over multiple fiber strandsB、optical technology for transmitting up to 16 channels over multiple fiber strandsC、a WDM system that is compatible with EDFA technologyD、a technology for transmitting more closely packed optical signals using more sophisticated transceiver designs than CWDM .
考题
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
考题
What is the point of using a combiner? （）A、Up to four sites can share one PCM link.B、Several TRXs can share one antenna system.C、The mobile can listen to two base stations at the same time.D、Only one base station is needed per site.E、Sending and transmitting can be performed from the same antenna.
考题
What is the recommended practice regarding UDLD when implementing it in all fiber-optic LANports？（）A、 Adjust the default hello timers to three seconds for aggressive modeB、 Enable it in global mode and on every interface you need to supportC、 Enable it in global mode to support every individual fiber-optic interfaceD、 Enable it to create channels containing up to eight parallel links between switches
考题
Which two statements best describe EtherChannel？（）A、EtherChannel technology helps aggregate traffic grouping multiple，full-duplex point-to-point linkstogetherB、EtherChannel technology is based on the 802.1 IEEE standC、EtherChannel can aggregate up to 800 Mbps，8 Gbps，or Gbps of aggregate bandwidth for a Fast EtherChannel，Gigabit EtherChannel，or 10 Gigabit EtherChannel connection respectivelyD、EtherChannel is defined for Rapid Spanning Tree for faster convergence
考题
What is the international standard for transmitting data over a cable sys tem?（）A、PPPoEB、DOCSISC、CMTSD、AAL5
考题
What are two enhancements that OSPFv3 supports over OSPFv2? （）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.
考题
Given the formula： （Fiber Attenuation * Km） + （Splice Attenuation * # of Splices） + （Connector Attenuation * # of Connectors） + （Optical Fiber or OADM） + Buffer（Fiber aging）） With regard to SONET/SDH optical calculations， what will the given formula provide？（）A、 fiber lossB、 OSNR levelC、 post amplificationD、 index of reflectionE、 index of refractionF、 power post amplification budget
考题
In optical channel transport unit overhead （OTU OH）， what are general communication channels 1 and 2（GCC1/GCC2） used for？（）A、for trail trace identificationB、as the backward defect indicatorC、to transmit information between OTU termination pointsD、to extend command and management functions over several framesE、General communication channels 1 and 2 （GCC1/GCC2） do not belong to OTU OH
考题
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)
考题
单选题Which WAN technology was designed to give homes and small business high speed digital dial-up service over already existing communication infrastructure?（）A
X25B
Frame RelayC
ATMD
ISDNE
ATXF
None of the above
考题
单选题In optical channel transport unit overhead （OTU OH）， what are general communication channels 1 and 2（GCC1/GCC2） used for？（）A
for trail trace identificationB
as the backward defect indicatorC
to transmit information between OTU termination pointsD
to extend command and management functions over several framesE
General communication channels 1 and 2 （GCC1/GCC2） do not belong to OTU OH
考题
多选题What are two enhancements that OSPFv3 supports over OSPFv2? （）AIt requires the use of ARP.BIt can support multiple IPv6 subnets on a single link.CIt supports up to 2 instances of OSPFv3 over a common link.DIt routes over links rather than over networks.
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What does the minimize load database parameter mean when backing up a database?（）A
RMAN will attempt to make the backup run as fast as possible without any IO limitations. B
RMAN will automatically restrict the number of channels in use to one. C
RMAN will spread the backup IO over the total duration stated in the backup command.D
RMAN will skip any datafile that currently is involved in an IO operation. RMAN will retry backing up the datafile later and an error will be raised at the end of the backup if the datafile cannot be backed up. E
Datafiles will be backed up; those having the lowest current number of IO operations will be backed up first.
考题
多选题What two descriptions best define DWDM？ （）Aa WDM system that is compatible with EDFA technologyBan optical technology for transmitting up to 16 channels over multiple fiber strandsCan optical technology for transmitting up to 32 channels over multiple fiber strandsDa technology for transmitting multiple optical signals using less sophisticated transceiver designthen CWDMEa technology for transmitting more closely packed optical signals using more sophisticatedtransceiver designs than CWDM
考题
单选题What should you do if you have transmitted a distress call a number of times on channel 16 and have received no reply?（）A
Repeat the message using any other channel on which you might attract attentionB
Key the microphone several times before transmitting againC
Turn up the volume on the receiver before transmitting againD
Report the problem to the head electrician
考题
多选题Dense Wavelength Division Multiplexing (DWDM) is an important innovation in optical networks.Which two descriptions best define DWDM?（）Aoptical technology for transmitting up to 32 channels over multiple fiber strandsBoptical technology for transmitting up to 16 channels over multiple fiber strandsCa WDM system that is compatible with EDFA technologyDa technology for transmitting more closely packed optical signals using more sophisticated transceiver designs than CWDM .
考题
多选题Which two statements are correct about the signaling methods that are utilized for transmitting voice？ （）AChannel-associated signaling transmits control signals in band and therefore reduces the bandwidth available for the voice data stream.BChannel-associated signaling utilizes a separate TDM channel for transmitting control signals.CCommon channel signaling transmits control signals in band and therefore reduces the bandwidth available for the voice data stream.DCommon channel signaling uses one of the TDM channels to transmit control information reducing the number of channels available for voice.EISDN BRIs implement channel-associated signaling.
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