Free Huawei H31-311_V2.5 Study Guides Exam Questions and Answer
H31-311_V2.5 Exam Dumps, H31-311_V2.5 Practice Test Questions
NEW QUESTION # 281
Which of the following descriptions about solving the system OSNR limitation problem are correct?
(Multiple choice)
- A. Enhanced HFEC error correction coding is used to improve OSNR by nearly 1 dB compared to AFEC.
- B. Use low noise figure NF, high performance EDFA and Ramani amplifier board, such as N13OAU1O6 or TN11RAU106, to improve the receiving OSNR of the system.
- C. Use advanced modulation and coding technology to reduce the baud rate and improve OSNR tolerance.
- D. Use the local oscillator laser of the same frequency to interfere with the received optical signal to improve the OSNR tolerance
Answer: B,C,D
NEW QUESTION # 282
PRBS can be used to test that the SDH service is healthy and that the protection reversal function is working.
- A. Error
- B. True
Answer: B
NEW QUESTION # 283
Which of the following correctly describes the order in which the signal flow between the SDH interface and the cross-unit passes through the module units?
- A. SPIMSTRSTMSAMSPHPT
- B. SPIRSTMSAMSPMSTHPT
- C. SPIRSTMSTMSPMSAHPT
- D. SPTMSTMSARSTMSPHPT
Answer: C
NEW QUESTION # 284
In which ITU-T recommendation is the OTN frame structure defined?
- A. G.709
- B. G.652
- C. G.694
- D. G.975
Answer: A
NEW QUESTION # 285
Both PDH and SDH have globally unified standards.
- A. True
- B. False
Answer: B
NEW QUESTION # 286
Which of the following are not passive optical devices? (Multiple choice)
- A. Laser
- B. Filter
- C. Modulator
- D. Optical switch
- E. Grating
Answer: A,C
NEW QUESTION # 287
The Raman amplifier uses which of the following effects?
- A. Self-Phase Modulation (SPM)
- B. Four Wave Mixing (FWM)
- C. Dispersion
- D. Raman scattering
Answer: D
NEW QUESTION # 288
If bit errors occur in the SDH network, the service signal restored after decapsulation will definitely contain bit errors.
- A. True
- B. False
Answer: B
NEW QUESTION # 289
According to the formula "OTUk rate = 255/(239 - k) x STM-N frame rate", the OTU3 signal rate is 255/236 x STM-N frame rate.
- A. FALSE
- B. TRUE
Answer: B
NEW QUESTION # 290
Which of the following alarms will definitely trigger optical line protection switching? (Multiple choice)
- A. R_LOS
- B. R_LOF
- C. POWER_DIFF_ OVER
- D. MUT_LOS
Answer: C,D
NEW QUESTION # 291
Two beams of light that meet the coherence condition are called coherent light. Two coherent light beams will produce interference phenomenon in the area where they meet. Which of the following meet the coherence condition? (Multiple choice)
- A. The two beams of light have the same phase or a constant phase difference in the area where they meet
- B. The two beams are perpendicular in phase at the encounter area
- C. The two beams of light vibrate at the same frequency in the area where they meet.
- D. The two beams of light vibrate in the same direction in the area where they meet
Answer: A,C,D
NEW QUESTION # 292
The refractive index of the core n1 () and the refractive index of the cladding n2 are necessary conditions for the transmission of optical signals in optical fibers.
- A. Equal to
- B. Greater than
- C. less than
Answer: B
NEW QUESTION # 293
Which of the following bytes in the regenerator part overhead are associated with R-OOF and R-LOF? (Multiple Choices)
- A. A1
- B. A2 ()
- C. B1.
- D. B2
Answer: A,B
NEW QUESTION # 294
When enabling NE performance monitoring events on the U2000 network management system, which of the following statements is correct? (Multiple choice)
- A. The 15-minute monitoring end time (which must be later than the 15-minute monitoring start time) can be left unset.
- B. The 15-minute monitoring end time (must be later than the 15-minute monitoring start time) must be set.
- C. Set the monitoring start time on the U2000 to 15 minutes (it must be later than the current time of the NMS and NE).
- D. Set a 15-minute monitoring start time on the U2000 (which can be earlier than the current time of the NMS and NE).
Answer: A,D
NEW QUESTION # 295
TNV2E224 board does not support which of the following types of protection?
- A. PW APS
- B. SNCP
- C. Tunnel APS
- D. LAG
Answer: B
NEW QUESTION # 296
The device IP address of the gateway element and the non-gateway element must be set in the same network segment.
- A. True
- B. False
Answer: B
NEW QUESTION # 297
Which of the following can be used as the central wavelength of the pump source in EDFA? (Multiple choice).
- A. 1310nm
- B. 980 nm
- C. 1510nm
- D. 1480nm
Answer: B,D
NEW QUESTION # 298
In the Windows operating system, the log files of the U2000 program are stored in the () directory of the U2000 installation disk.
- A. U2000/client/log
- B. U2000/Server
- C. U2000/server/log
- D. U2000/Customer
Answer: C
NEW QUESTION # 299
Which of the following board configurations for ROADM nodes are correct? (Multiple choice)
- A. WSM9+WSD9
- B. WSMD9
- C. WSD9+RMU9
- D. WSM9+RDU9
Answer: B,C,D
NEW QUESTION # 300
When using the LCAS function, which of the following overhead bytes is used to transmit control information? (Multiple Choices)
- A. K2
- B. H4
- C. K4
- D. M1
Answer: B,C
NEW QUESTION # 301
When the bridge uses ivl learning mode, an entry in the MAC address table is created based on the source MAC address and source port of the teach frame. This entry applies to all VLANs
- A. True
- B. False
Answer: B
NEW QUESTION # 302
MPLS is a label forwarding technology. Which of the following was its original design purpose?
- A. Avoid broadcast storms
- B. Reduce network latency
- C. Increase the forwarding speed of the router
- D. Improve the utilization rate of P addresses
Answer: C
NEW QUESTION # 303
Which of the following ITLI-T recommendations define the OTN frame structure?
- A. G.709
- B. G.652
- C. G.694
- D. G.975
Answer: A
NEW QUESTION # 304
A subnet mask is a 32-bit address consisting of a string of 1s followed by a string of 0s, such as:
255.255.0.255 is a valid subnet mask.
- A. True
- B. False
Answer: B
NEW QUESTION # 305
When the ACT indicator of the SDH board is off, it means that the board has a hardware failure and cannot be used.
- A. True
- B. False
Answer: B
NEW QUESTION # 306
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