V1.0 Flashcards

What is the primary purpose of a site survey in a WLAN deployment?

Answer: To determine optimal AP placement and channel assignment

A site survey identifies RF coverage gaps, interference sources, and optimal AP placement to ensure adequate WLAN performance.

Which 802.11 amendment introduced OFDMA as a key technology for improved multi-user efficiency?

Answer: 802.11ax

802.11ax (Wi-Fi 6) introduced OFDMA, allowing simultaneous transmission to multiple clients within a single channel.

A CWNA candidate reads that an AP has a transmit power of 20 dBm. What is the equivalent power in milliwatts?

Answer: 100 mW

0 dBm = 1 mW; every 10 dB increase is a 10× power multiplication, so 20 dBm = 100 mW.

Which type of antenna radiates RF energy equally in all horizontal directions, making it ideal for general indoor coverage?

Answer: Omni-directional antenna

Omni-directional antennas radiate in a 360° horizontal pattern, providing uniform coverage in all directions.

What does the term 'EIRP' represent in wireless networking?

Answer: Effective Isotropic Radiated Power

EIRP (Effective Isotropic Radiated Power) is the total power radiated, combining transmit power and antenna gain minus cable losses.

In 802.11 WLANs, which frame type is used by access points to announce their presence and capabilities?

Answer: Beacon

Beacon frames are periodically broadcast by APs to advertise the BSS, including SSID, supported rates, and security capabilities.

A network engineer needs to connect two buildings 1 km apart using a wireless bridge. Which antenna type is MOST appropriate for this point-to-point link?

Answer: High-gain directional antenna

High-gain directional antennas focus RF energy in a narrow beam, providing the range and signal strength needed for long-distance point-to-point links.