CWT WLAN Installation & Configuration 3 — Questions and Answers
Question 1: What is the function of the 802.11r amendment in a WLAN?
- Increases maximum transmit power
- Enables fast BSS transition (fast roaming) between APs (Correct answer)
- Adds support for 5 GHz channels
- Defines mesh networking protocols
Correct answer: Enables fast BSS transition (fast roaming) between APs
802.11r defines Fast BSS Transition, reducing roaming latency by pre-authenticating clients before they fully move to a new AP.
Question 2: A WLC is being configured to use FlexConnect (H-REAP) mode. What happens to client traffic when the WAN link to the WLC goes down?
- All clients are disconnected immediately
- The AP stops broadcasting SSIDs
- The AP locally switches traffic and maintains existing client sessions (Correct answer)
- The AP reboots and joins a backup controller
Correct answer: The AP locally switches traffic and maintains existing client sessions
In FlexConnect mode, APs can locally switch traffic and maintain client sessions even when connectivity to the WLC is lost.
Question 3: Which value represents the minimum acceptable SNR for a voice-grade WLAN deployment?
- 10 dB
- 15 dB
- 25 dB (Correct answer)
- 40 dB
Correct answer: 25 dB
A minimum SNR of 25 dB is generally recommended for voice applications to ensure low latency and packet loss.
Question 4: When configuring band steering on a dual-band AP, what is the intended outcome?
- Force all clients to the 2.4 GHz band for wider coverage
- Encourage capable clients to connect on the 5 GHz band (Correct answer)
- Prevent clients from roaming between APs
- Balance equal numbers of clients on each band
Correct answer: Encourage capable clients to connect on the 5 GHz band
Band steering nudges dual-band capable clients toward the 5 GHz band to reduce congestion on the 2.4 GHz band.
Question 5: A technician is installing an outdoor AP on a building rooftop. Which grounding method is required to protect against lightning damage?
- Ground the AP chassis to the nearest metal pipe
- Connect the AP to a proper earth ground via a grounding wire and rod (Correct answer)
- Install a surge protector on the power outlet only
- No grounding is needed for low-power outdoor APs
Correct answer: Connect the AP to a proper earth ground via a grounding wire and rod
Outdoor APs must be bonded to an earth ground via a grounding wire connected to a grounding rod to provide lightning protection.
Question 6: What does EIRP stand for in the context of wireless networking?
- Enhanced Interference Reduction Protocol
- Equivalent Isotropically Radiated Power (Correct answer)
- External IP Routing Protocol
- Effective Internal Radio Power
Correct answer: Equivalent Isotropically Radiated Power
EIRP (Equivalent Isotropically Radiated Power) is the total power radiated by an antenna system, combining transmit power and antenna gain.
Question 7: Which 802.11 feature allows an AP to dynamically select the best channel and reduce transmit power to minimize interference with neighboring APs?
- TPC and DFS (Correct answer)
- MU-MIMO
- OFDMA
- BSS Coloring
Correct answer: TPC and DFS
Transmit Power Control (TPC) and Dynamic Frequency Selection (DFS) work together to automatically optimize channel selection and power levels.
CWT WLAN Installation & Configuration 3
What is the function of the 802.11r amendment in a WLAN?