GB0-342-MOCK

1. The radio frequency band used by 802.11 is ______.

A. 400 MHz and 800 MHz

B. 900 MHz and 1800 MHz

C. 900 MHz and 1800 MHz

D. 5 GHz and 8 GHz

2. WLAN is widely applied. Compared with the traditional wired network, its advantages include:

A. Users can freely connect to the WLAN without cable and port restrictions.

B. In some special geographical environment, WLAN can greatly reduce the cost of network construction and make network construction more economical.

C. WLAN can meet the mobility needs of all industries on the network applications, greatly improving the efficiency of the work.

D. WLAN can provide higher data bandwidth and more stable network connections than the wired network.

3. Which of the following statements about the electromagnetic wave is correct?

A. An electromagnetic wave is a form of motion of an electromagnetic field. It is formed when a changing electromagnetic field is propagated in space, and requires propagation medium.

B. The relationship between the electromagnetic wavelength and the frequency is "wavelength=c/Frequency", where c is the speed of light.

C. The 2.4 GHz and 5 GHz frequency bands defined in the 802.11b/a/g protocol are ultra-high and extremely-high frequency bands of radio waves.

D. The properties of electromagnetic waves include energy, polarization, phase, and frequency.

4. Which of the following statements about digital bandwidth and analog bandwidth are correct?

A. "The digital bandwidth is the amount of information that can be transmitted within unit time, generally in bits per second (bps). The actual throughput of the data communication system is generally larger than the digital bandwidth of the system."

B. Analog bandwidth refers to a frequency range of the analog electrical system. Generally, the unit is Hz.

C. In the wireless communication system, the maximum rate of digital transmission is restricted by the bandwidth of analog channels.

D. When the channel bandwidth is fixed, the actual channel capacity depends on numerous factors such as the signal-to-noise ratio of the communication system and the modulation and transmission technologies adopted in the communication system.

5. Which of the following frames are management frames on the 802.11 MAC layer?

A. Beacon

B. Probe Request/Response

C. RTS, CTS, ACK

D. Authentication Request/Response

6. Transmission technology ______ is used to address the hidden node issue on the 802.11 network.

A. CSMA/CA

B. CSMA/CD

C. RTS/CTS

D. CTS-to-Self

7. Which of the following wireless protocols can work at 2.4 GHz?

A. 802.11a

B. 802.11n

C. 802.11g

D. 802.11b

8. Which of the following statements about the WLAN scanning modes of STAs are correct?

A. The STA selects either active scanning or passive scanning mode.

B. After the AP hides the SSID, the STA can discover services provided by the AP only through active scanning.

C. The STA listens to the Probe Response packets sent by the AP to achieve active scanning.

D. The Probe Request packets sent by the STA are classified into broadcast and unicast types, subject to the SSID carried in the packets.

9. Which of the following statements about the antenna gain are correct? ______

A. The antenna gain should be large, since the antenna with a larger gain can obtain higher transmit power.

B. The antenna gain selection should comply with scenario requirements. It is not the greater the gain the better.

C. A larger antenna gain indicates a higher degree of signal convergence.

D. The outdoor remote coverage scenario is applicable to directional antennas with gains higher than 10 dBi.

10. Which of the following statements about the data forwarding principles between the H3C wireless controller and the AP are correct?

A. An IPinIP tunnel is established between the wireless switch and the AP. The wireless switch considers the tunnel as a virtual port.

B. Any data packets of the STA will be sent to the wireless switch through the IPinIP tunnel by the AP and uniformly forwarded by the wireless switch.

C. "The wireless switch decapsulates packets received from the user end over the IPinIP tunnel and exchanges data. If the outbound interface encapsulates the packets again and exchanges the packets to the farthest end over the tunnel."

D. The IPinIP tunnel between the wireless switch and the AP adopts the TCP connection.

11. Which of the following statements about the FIT AP data forwarding mode and logic are correct?

A. In L3 registration option43 mode, after obtaining an IP address, the AP sends a unicast Discovery packet to the address of an AC specified by option43.

B. In L3 registration option43 mode, after obtaining an IP address, the AP sends a broadcast Discovery packet. If no response from the AC is received, the AP sends a unicast Discovery packet.

C. You can manually configure the AC IP address on the AP to complete L3 registration. However, this mode requires initialization configuration on the AP, which is complex. Therefore, this mode is not recommended.

D. In DNS mode, you only need to specify the relevant domain name to map the AC IP address on the DNS Server, without making any special configuration for the DHCP Server.

12. Generally, the H3C wireless bridging function adopts the peer MAC configuration mode. In specific configuration, in addition to configuring the MAC address of the peer device on the local device, you also need to ______ on the two bridged devices.

A. Configure the same channel.

B. Configure the same mesh-id.

C. Configure the same encryption key.

D. Configure the same SSID for wireless access services.

13. Common WLAN troubleshooting methods include:

A. Hierarchical troubleshooting method

B. Block troubleshooting method

C. Replacement method

D. One-step-one method

14. What are possible reasons for FIT AP registration failure?

A. The AP is not powered on.

B. The DHCP address pool is full, and the AP cannot obtain the IP address.

C. The AP and AC routes are inaccessible or the license on the AC is insufficient.

D. The AP module SN is incorrectly configured on the AC, or the radio interface configuration on the AC is incorrect.

15. Which of the following methods can be used to avoid signal interference?

A. Select channels 3, 6, and 11 to configure frequency in adjacent areas.

B. If the target coverage area already has channels used by APs, adjust the positions of the APs by means of physical isolation.

C. For outdoor area interference, adjust the antenna azimuth to avoid interference caused by main lobe correlation of antennas.

D. Appropriately select different types of antennas (with different spatial lobe shapes) according to local conditions, to reduce co-channel interference in space.

GB0-392-MOCK Reference Answer