1. How many channels can the 2.4 GHz band be divided into?

2. Which of the following rates is not the rate supported by the 802.11a protocol?

3. The 802.11 physical layer standard defines some common operations of the wireless network at the physical layer: operations such as QoS, security, and roaming.

4. The Barker code is an 11-bit sequence (for example, 10110111000), which has advantages in wireless transmission, which can effectively reduce interference, but reduces efficiency.

5. What are the two basic service sets included in BSS (Select 2 Answers)?

6. Which of the following standards organizations is proposed by the CAPWAP protocol?

7. If a wireless client connecting the same SSID wants to roam from one AP to another, what is the area of the signal overlap between the two APs?

8. What is the Chinese name of SSID?

9. IEEE is the standard organization responsible for the use of wireless frequencies in the United States.

10. What is correct in the following options (Select 3 Answers)?

11. If the AP works in infrastructure mode, the AP's working state is full-duplex mode.

12. There are four wireless STAs.
Which workstations occupy the channel preferentially according to the following backoff time parameters?

13. Unlike the 802.11a/b/g standard, the 802.11n protocol is a dual-band mode of operation (supporting two operating bands of 2.4 GHz and 5 GHz).

14. When a data frame is sent and acknowledged, what is the time interval to wait before the next data frame is sent ()?

15. What is the working frequency band used in the original 802.11 protocol?

16. BSS is called Basic Service Set, and BSS can be divided into Independent BSS and Infrastructure BSS.

17. Which country or region is ETSI a standard organization?

18. What is the maximum rate supported by the original 802.11 protocol?

19. What are the following WLAN standards for transmission rates up to 54 Mbps and above (Select 3 Answers)?

20. Spread-spectrum technology is the basis for transmitting wireless data using the ISM band.