Wireless Signal & Interference Troubleshooting Quiz

1. Which frequency band offers more available channels but typically has shorter range than 2.4 GHz?

900 MHz

2.4 GHz

5 GHz

6 GHz

2. When a wireless signal is blocked by an obstacle but still reaches the client through reflection or diffraction, this is called ____.

Multipath propagation

Line-of-sight transmission

Signal amplification

Frequency hopping

3. Which wireless standard introduced the 6 GHz band to reduce congestion and interference?

802.11ax

802.11ac

802.11n

802.11be

4. What is the typical maximum transmission power (EIRP) limit for 802.11 devices in the United States?

10 dBm

20 dBm

30 dBm

50 dBm

5. A client cannot connect to the wireless network despite being within range. Which is the first configuration to verify?

Gateway IP address

SSID and security credentials

DNS server address

Proxy settings

6. What wireless troubleshooting technique involves scanning for available networks and their signal levels?

Site survey

Packet sniffing

Firmware update

MAC filtering

7. In 802.11ac networks, what is the typical channel width to achieve maximum data rates?

20 MHz

40 MHz

80 MHz

160 MHz

8. You discover two adjacent access points are using the same channel. What is the primary negative effect?

Faster data transmission

Co-channel interference reducing throughput

Automatic failover

Increased security

9. Which antenna configuration typically provides the best omnidirectional coverage for an indoor access point?

Horizontal dipole antennas

Vertical dipole antennas

Directional parabolic antenna

Yagi antenna

10. What does the term 'dead zone' refer to in wireless network coverage?

Area where access point is offline

Area with weak or no signal coverage

Area where DHCP fails

Area where encryption is disabled

11. Which wireless standard operates at 5 GHz and provides higher data rates with less interference than 2.4 GHz?

802.11b

802.11g

802.11a

802.11n

12. A wireless network experiences intermittent disconnections during peak hours. What is the most likely cause?

Incorrect DNS settings

Channel congestion and co-channel interference

Expired DHCP lease

Incorrect subnet mask

13. When troubleshooting wireless connectivity, which tool would you use to visualize signal strength across different channels?

Wi-Fi analyzer app

Ping utility

Tracert command

Ipconfig tool

14. What is the recommended placement for an access point to maximize coverage in a multi-story building?

Basement corner

Central location elevated above obstacles

Top floor against outer wall

Inside a server rack

15. Which material is most likely to cause significant wireless signal attenuation?

Drywall

Concrete and rebar

Glass

Plastic paneling

16. A client device shows poor signal strength despite being near the access point. What should you check first?

Router firmware version

Antenna orientation and position

ISP connection speed

Client device IP address

17. What does RSSI stand for in wireless networking diagnostics?

Received Signal Strength Indicator

Radio Signal Service Interface

Remote System Signal Index

Roaming Signal Speed Indicator

18. Which of the following devices commonly causes interference in the 2.4 GHz wireless band?

Microwave oven

Laser printer

Ethernet switch

Network patch panel

19. In the 2.4 GHz band, how many non-overlapping channels are available for 802.11b/g networks?

3

5

8

13

20. What is the primary cause of signal degradation when a wireless access point is placed inside a metal cabinet?

Signal reflection

Signal absorption

Channel interference

Power amplification

A+ Troubleshooting Wireless Signal and Interference Issues Quiz