2021 Updated Verified Pass H31-311 Exam - Real Questions & Answers
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NEW QUESTION 100
Which of the following is the frame whose VC-4 J1 byte is indicated by the current frame's AU pointer?
- A. None of the above
- B. Next frame
- C. Current frame
- D. Previous frame
Answer: B
NEW QUESTION 101
Which of the following ITU-T recommendations defines the OTN frame structure?
- A. G.975
- B. G.709
- C. G.694
- D. G.652
Answer: B
NEW QUESTION 102
After PDH services are configured on a per-NE basis, a complete trail cannot be searched out. Which of the following are possible causes? (Multiple Choice)
- A. Line board selection is incorrect.
- B. Pass-through is not configured at intermediate sites.
- C. Tributary board selection is incorrect.
- D. Timeslot configuration is incorrect.
Answer: A,B,D
NEW QUESTION 103
When an optical fiber between node A and node B is broken, the FIU on node B detects the OTS_LOS alarm and inserts the OTS_BDI alarm to node A.
The FIU on node A reports the OTS_BDI alarm. The line board on the downstream C node reports the OCh_SSF alarm.
- A. FALSE
- B. TRUE
Answer: B
NEW QUESTION 104
The single-fiber bidirectional WDM system uses only one optical fiber to transmit optical signals in two directions at the same time. The optical signals in the two directions should be arranged at different wavelengths.
- A. FALSE
- B. TRUE
Answer: B
NEW QUESTION 105
Which of the following statements about extended ECC is incorrect?
- A. Automatic extended ECC can be enabled on a maximum of four NEs. In manual extended ECC mode, each server can be connected to a maximum of three clients.
- B. Extended ECC in specified mode indicates that the server and client need to be specified.
- C. Automatic extended ECC indicates using a straight-through cable to connect the Ethernet ports of two NEs.
- D. Extended ECC is classified into automatic extended ECC and extended ECC in specified mode.
Answer: A
NEW QUESTION 106
The SL64 board can be used in an OSN 2500.
- A. FALSE
- B. TRUE
Answer: A
NEW QUESTION 107
When synchronization is performed on the 1U2000, the NE data that is the same as that on the U2000 is not uploaded to the U2000, and the data that exists on the U2000 but not on the NE is deleted.
- A. FALSE
- B. TRUE
Answer: A
NEW QUESTION 108
Which of the following statements about the definition of SDH is correct?
- A. A hierarchy that can be used for asynchronous digital transmission
- B. A hierarchy of standardized digital signals that can be asynchronously cross-connected
- C. A complete standard digital signal hierarchy that provides synchronous digital transmission, multiplexing, and cross-connection
- D. A hierarchy of standardized digital signals that can be asynchronously multiplexed
Answer: C
NEW QUESTION 109
When a working PQ1 board is faulty, the device performs TPS protection switching. Which of the following statements about the switching process are correct? (Multiple Choice)
- A. The protection PQ1 board receives and processes the services that are transferred from the D75S board to the protection bus to complete the protection switching.
- B. The cross-connect board detects that the PQ1 board is faulty through the board status bus.
- C. If the protection PQ1 board is normal, the cross-connect board sends a switching message to the D75S corresponding to the faulty PQ1 board through the switching control bus.
- D. The D75S board responds to the switching message by transferring services to the shared protection bus and stopping sending services to the faulty PQ1 board.
Answer: A,B,C,D
NEW QUESTION 110
TU-AIS is frequently encountered during network maintenance. Which of the following alarms can trigger the TU-AIS alarm? (Multiple Choice)
- A. AU-LOP
- B. B2-EXC
- C. R-LOS
- D. HP-TIM
Answer: A,B,C,D
NEW QUESTION 111
Which of the following is the default WTR time for MSP switching?
- A. 12 minutes
- B. 15 minutes
- C. 6 minutes
- D. 10 minutes
Answer: D
NEW QUESTION 112
In the case of SNCP, a line board selectively receives services. Therefore, the SNCP can protect the services on the line.
- A. FALSE
- B. TRUE
Answer: A
NEW QUESTION 113
An optical amplifier unit compensates for line loss and extends transmission distance. Connecting multiple optical amplifier units in cascading mode can infinitely extend transmission distance of a system.
- A. FALSE
- B. TRUE
Answer: A
NEW QUESTION 114
Which of the following is not a non-linear effect?
- A. Self-phase modulation (SPM)
- B. Raman scattering
- C. Dispersion
- D. Four-wave mixing (FWM)
Answer: C
NEW QUESTION 115
Which of the following are the main advantages of SDH?
(Multiple Choice)
- A. Synchronous multiplexing
- B. Powerful OAM
- C. Standard interfaces
- D. High compatibility
Answer: A,B,C,D
NEW QUESTION 116
Which of the following is not a condition for triggering multiplex section protection (MSP)?
- A. R-LOS is detected.
- B. The MS-AIS signal is detected.
- C. R-LOF is detected.
- D. AU-AIS is detected.
Answer: D
NEW QUESTION 117
The fiber core refractive index n1 must be ( ) the cladding layer refractive index n2, which is a necessary condition for transmitting optical signals in optical fibers.
- A. equal to
- B. higher than
- C. lower than
Answer: B
NEW QUESTION 118
After the U2000 delivers configuration data to an NE, if the verification fails on the SCC board, the NE enters the installation state.
- A. FALSE
- B. TRUE
Answer: B
NEW QUESTION 119
Forced switching, fiber cut switching, manual switching, and exercise switching are in the descending order of priority.
- A. FALSE
- B. TRUE
Answer: B
NEW QUESTION 120
Which of the following layers defines the protocols that control the network layer? The protocols of the layer work on logical links, that is end-to-end connections between two devices.
- A. Data link layer
- B. Transport layer
- C. Network layer
- D. Application layer
Answer: B
NEW QUESTION 121
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