Huawei h12-311 practice test

Which modulation method is the picture below ()?

• A. AM
• B. FM
• C. phase modulation
• D. Wave modulation

What was the name of the first radio communication network based on packet technology ()?

• A. INTERNET
• B. ARPANet
• C. ALOHNET
• D. NSFnet

WLAN What are the working frequency bands ()? (Select 2 Answers)

• A. 2 GHz
• B. 5 GHz
• C. 5.4 GHz
• D. 2.4 GHz

2.4 GHz How many channels () can the frequency band be divided into at most?

• A. 14
• B. 13
• C. 11
• D. 3

2.4 GHz What is the frequency band US non-overlapping channel ()?

• A. 2,7,12
• B. 3,8,13
• C. 1,6,11
• D. 3,7,13

2.4 GHz What is the distance between the center frequencies of the channels in the frequency band
()?

• A. 20 MHz
• B. 22 MHz
• C. 5 MHz
• D. 10 MHz

802.11g What is the bandwidth of each channel of the frequency band ()?

• A. 25 MHz
• B. 20 MHz
• C. 50 MHz
• D. 22 MHz

Which of the following protocols can support at the same time 2.4GHz Frequency band and 5GHz
Frequency band()?

• A. 802.11a
• B. 802.11b
• C. 802.11g
• D. 802.11n

2.4 GHz What is the range of operating frequency specified by China ()?

• A. 2.4 GHz-2.4835 GHz
• B. 2.471 GHz-2.497 GHz
• C. 2.4465 GHz-2.4835 GHz
• D. 2.445 GHz-2.475 GHz

Which of the following technologies work at 5 GHz ()? (Select 2 Answers)

• A. radar
• B. Bluetooth
• C. Infrared
• D. Digital satellite