Huawei H31-341_V2.5 問題集

質問 1：
Which of the following description about QPSK modulation technology is wrong? (Multiple choice)
A. EPDM-QPSK is the best solution for 100G WDM transmission.
B. Through QPSK, one phase represents 2 digital bits, which is equivalent to the processing of "1 is divided into 2" for the data, and the rate is reduced by half.
C. The essence of QPSX is to reduce the baud rate of the optical signal by half without reducing the line rate by selecting two possible values for the phase of the optical field.
D. QPSK modulation can increase the spectral bandwidth, reduce the OSNR requirements of the system and the damage of fiber nonlinearity, and improve the dispersion tolerance and PMD tolerance.
正解：C,D

質問 2：
The decrease of signal-to-noise ratio at the receiving end will not cause bit errors.
A. False
B. True
正解：A

質問 3：
Which of the following descriptions about L2VPN is wrong?
A. L2VPN includes E-LINE and E-LAN. E-LINE is used to provide L2 layer point-to-point services, and E-LAN is used to simulate LAN in WAN
B. The E-LAN service based on PW is also called VPLS service, which is a Layer 2 VPN technology that simulates a local area network.
C. The E-LINE service based on PW is a point-to-point Layer 2 VPN technology, which transparently transmits Layer 2 services between users
D. When configuring the E-LINE service based on PW, it is necessary to create a virtual switching instance VSI
正解：A

質問 4：
The single-wavelength optical power index of the 100G system is lower than that of the 10G system. The 10G system can expand the 100G channel by reducing the 0A gain, thereby reducing the 0A single-wavelength output optical power to meet the fiber-entry optical power requirements.
A. False
B. True
正解：A

質問 5：
If a fiber break occurs between the amplifier OA and the FIU, which of the following alarms will be reported by the system?
A. OMS_LOS
B. OTS_LOS
C. R_LOS
D. MUT_LOS
正解：D

質問 6：
Which of the following types of optical network elements defined in U2000? (Multiple choice)
A. WDM_OADM
B. WDM_OTM
C. WDM_OLA
D. WDM_OFQ
正解：A,B,C,D

質問 7：
NG WDM devices only support the global label space, and the size of the label space is 32768
A. False
B. True
正解：B

質問 8：
When the fiber between node and node B is open, the RU on the node detects the OTS_LOS alarm and inserts the OTS_BDI alarm into the node A. The RU on the node A reports the OTS_BDI alarm. The line board on the downstream node C reports the OCh_SSF alarm.
A. False
B. True
正解：B

質問 9：
After enabling TCM monitoring, when the upstream station detects a LOF alarm, it will plug in the IAE local end and report the ODU1_TCMn_IAES performance event.
A. False
B. True
正解：B