Wireless Technologies & Network Fundamentals Flashcards

What is the maximum transmit power allowed for 5 GHz UNII-3 band operation in the United States under FCC rules?

Answer: 30 dBm

The FCC allows up to 30 dBm (1 watt) EIRP for client devices in the UNII-3 (5.725–5.850 GHz) band.

Which wireless topology allows devices to communicate directly with each other without an access point?

Answer: Independent BSS (IBSS)

An IBSS (Independent Basic Service Set), also called ad hoc mode, lets devices communicate peer-to-peer without an AP.

What does RSSI measure in a wireless network?

Answer: The relative received signal strength from an AP

RSSI (Received Signal Strength Indicator) is a relative measure of the power of the received radio signal, typically expressed in dBm.

Which 802.11 feature allows an AP to dynamically switch channels to avoid radar interference in the 5 GHz band?

Answer: DFS (Dynamic Frequency Selection)

DFS enables APs to detect radar systems and automatically move to a different channel to avoid interference, as required by FCC/ETSI regulations.

A network uses 20 MHz channels in the 2.4 GHz band. How many non-overlapping channels are available in the US?

Answer: 3

In the US 2.4 GHz band, only channels 1, 6, and 11 are non-overlapping when using 20 MHz channel widths.

What is the significance of the 'guard interval' in OFDM-based 802.11 transmissions?

Answer: It prevents inter-symbol interference caused by multipath

The guard interval is a short pause between OFDM symbols that prevents inter-symbol interference caused by delayed multipath reflections.

Which protocol is used by WPA3-Personal to replace the PSK handshake and provide forward secrecy?

Answer: SAE (Simultaneous Authentication of Equals)

WPA3-Personal replaces the 4-way handshake PSK exchange with SAE (Dragonfly handshake), which provides perfect forward secrecy and resistance to offline dictionary attacks.