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H31-311_V2.5 Huawei HCIA-Transmission V2.5 Free Practice Exam Questions (2025 Updated)

Prepare effectively for your Huawei H31-311_V2.5 HCIA-Transmission V2.5 certification with our extensive collection of free, high-quality practice questions. Each question is designed to mirror the actual exam format and objectives, complete with comprehensive answers and detailed explanations. Our materials are regularly updated for 2025, ensuring you have the most current resources to build confidence and succeed on your first attempt.

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Total 246 questions

Which of the following sites support service adding/dropping?

A.

ROADM

B.

OLA

C.

FOADM

D.

OTM

D1 to D12 are digital communication channel bytes. D1 to D6 are used in the regenerator section, and D7 to D12 are used in the multiplex section.

A.

TRUE

B.

FALSE

The clock unit can only access the external clock source as the timing signal source of the system through the external clock interface. In addition; It can also output a processed clock and provide a clock source for other devices that need timing.

A.

True

B.

False

In the colored scenario, the TM20fTD20 board can be used to add/drop wavelengths.

A.

TRUE

B.

FALSE

A light wave has two independent and orthogonally polarized modes on the plane perpendicular to the transmission direction, which are generally called X polarization and Y polarization respectively. Using this property of optical signals, the polarization multiplexing separately modulates optical signals on the two orthogonal polarizations.

A.

TRUF

B.

FALSE

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

Transmitting test frames affects services.

A.

TRUE

B.

FALSE

Which of the following statements about basic LCAS functionality are correct? (Multiple choice).

A.

New network elements and links are automatically discovered.

B.

Bandwidth dynamically increases or decreases. .

C.

Failed members are protected and restored. .

D.

Provides a fault-tolerant mechanism to enhance the robustness of the virtual cascading function. .

Which factors determine the optical signal-to-noise ratio (OSNR) of the receiving end to a certain extent After the signal transmission in the WOM system is transmitted over a certain distance, the "oSNR" of the receiving end of the optical signal-to-noise ratio is reduced to a certain extent. Which of the following is the main cause?

A.

Use EDFA. ).

B.

Use of multi-density multiplexers and multiplexers.

C.

Do not use new optical fibers.

D.

Optical fiber attenuation is too high.

Which of the following is affected by changing the element ID of OSN3500 on NMS?

A.

Interruption of business.

B.

Restart your device.

C.

Network element communication is interrupted.

D.

NE time is out of sync.

On the NMS system, the network element performance monitoring time is set to () minutes and () hours.

A.

15.12

B.

15.24

C.

30.12

D.

30.24

Which of the following statements regarding the sequence of signal flows between the SDH interface and the cross-connecting unit is correct?

A.

SPI <> RST <> MST <> MSP<> MSA <> HPT

B.

SPI <> RST <> MSA<> MSP<> MST <> HPT

C.

SPI <> MST<> RST <> MSA <> MSP >HPT

D.

SPT<> MS <> MSA<> RST > MSP<> HPT

Array waveguide grating (AWG) multiplexer/multiplexer has the following advantages: short wavelength spacing, large number of channels and flat passband. Suitable for DWDM systems in ultra-high speed, large tubes.

A.

True

B.

False

Which of the following statements about overhead bytes is incorrect?

A.

A1 and A2 are framed bytes" These bytes are used to separate STM-1 frames in the signal stream. .

B.

J0 is the regenerator part trace byte. This byte is used to resynch the send segment access point identifier so that the receiving end can verify its continuous connection to the specified sender.

C.

B1 is better than holding interleaved parity 8 (BIP-8). This byte is used to monitor for bit Falses in the regenerator section layer.

D.

E1 and E2 are wired bytes. These bytes are used to provide a voice channel for order line connections.

Forced switching, fiber switching, manual switching and motion switching are decreased in order of priority.

A.

True

B.

False

On a Layer 2 switching device, if the Ethernet port is an Access port, the port can only receive Ethernet frames without a VLAN tag or Ethernet frames with the same VLAN ID as the default VLAN ID of the port.

A.

True

B.

False

EPL services use bandwidth exclusively on the line, which is very safe. Dedicated line applications for VIP customers

A.

True

B.

False

Which of the following are the main advantages of SDH?

A.

High compatibility

B.

Powerful OAM

C.

Synchronous multiplexing

D.

Interface specifications

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.

TRUE

B.

FALSE

Optical monitoring channel is used for monitoring of WDM optical transmission systems. In the UU-T recommendation, it is preferable to use a 1510 nm wavelength of the a ") rate.

A.

64 kbit/s

B.

192 kbit/st

C.

2 Mbit/s

D.

5676 kbit/s

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Total 246 questions
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