Huawei HCIA-WLAN H12-311 Questions & Answers

• Question 21:

  Commonly used RF cables for WLAN systems are (ABC) (Select 3 Answers).

  A. RG-8 jumper

  B. 1/2" (inch) super soft feeder

  C. 1/2" (inch) feeder

  D. 13/8" (inch) feeder

  Correct Answer: ABC

• Question 22:

  The following description of the splitter and coupler is correct .

  A. Power splitter and coupler are equal power allocation

  B. Power splitter is equal power distribution, coupler is unequal power distribution

  C. Power splitter is unequal power distribution, coupler is equal power distribution

  D. Power splitter and coupler are unequal power distribution

  Correct Answer: B

• Question 23:

  For outdoor long-distance point-to-point backhaul, the antenna of should be selected.

  A. High gain, small lobe width

  B. High gain, large lobe width

  C. Omnidirectional

  D. Low gain, large lobe width

  Correct Answer: A

• Question 24:

  The following statement about antenna classification is correct (Select 2 Answers)?

  A. Classification by direction: omnidirectional antenna, directional antenna, etc.

  B. Classification by shape: wire antenna, planar antenna, etc.

  C. Classification by use: short wave antenna, ultrashort wave antenna, microwave antenna, etc.

  D. Classification by working frequency band: communication antenna, TV antenna, radar antenna, etc.

  Correct Answer: AB

• Question 25:

  AP transmit power 20dBm, antenna gain 4dBi, cable and device loss 1dB, terminal receive antenna gain 2dBi, spatial propagation loss 80dB, terminal receive level RSSI=.

  A. -57

  B. -56

  C. -55

  D. -54

  Correct Answer: B

• Question 26:

  The number of users is 300, and the concurrency rate is 70%. The terminal supports the 2.4 GHz and 5 GHz frequency bands. According to the maximum number of users per dual-band dual-frequency AP, at least APs can meet the capacity requirements.

  A. 5

  B. 6

  C. 7

  D. 8

  Correct Answer: B

• Question 27:

  For indoor distributed APs, the following description is correct (B).

  A. AP power can be up to 800mW.

  B. It can be deployed in conjunction with the carrier's 3G network.

  C. Waterproof and dustproof

  D. AP6310SN supports dual frequency mode

  Correct Answer: B

• Question 28:

  There are three types of Huawei load balancing judgment: traffic mode, session mode, and virtual switch mode.

  A. True

  B. False

  Correct Answer: B

• Question 29:

  For lobe width, the following description is correct (Select 3 Answers).

  A. In the main lobe range, the power density decreases by half (3dB) relative to the maximum radiation direction.

  B. The narrower the lobes, the better the directionality, the farther the radiation distance, the stronger the anti-interference ability

  C. The pattern usually has two or more petals

  D. The terminal can receive the signal only within the half power angle coverage.

  Correct Answer: ABC

• Question 30:

  For the polarization of electromagnetic waves, the following description is correct (Select 3 Answers).

  A. The antenna radiates electromagnetic waves to the surrounding space, and the direction of the electric field changes according to a certain law.

  B. The polarization of the antenna refers to the direction of the magnetic field strength formed by the antenna radiation.

  C. If the electric field of the electric wave is perpendicular to the ground, we call it a vertically polarized wave.

  D. If the transmitting antenna is circularly polarized, the receiving antenna must also be circularly

  polarized, and both polarization directions must be the same

  Correct Answer: ABD