WLAN Hardware & Software Components Flashcards
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Which antenna type radiates power equally in all horizontal directions, making it ideal for general-coverage deployments?
Answer: Omnidirectional antenna
Omnidirectional antennas radiate power in a 360-degree horizontal pattern, providing uniform coverage in all directions around the antenna.
What is the primary function of a wireless LAN controller (WLC) in a centralized architecture?
Answer: Centrally manage and control lightweight access points
A WLC centrally manages lightweight APs by handling configuration, firmware updates, RF management, and client roaming in a CAPWAP-based architecture.
A PoE switch port is rated at 802.3af. What is the maximum power it can deliver to a connected access point?
Answer: 15.4 watts
IEEE 802.3af (PoE) delivers a maximum of 15.4 watts at the power-sourcing equipment (PSE) port, with up to 12.95 watts available at the powered device.
What component in an access point converts the digital baseband signal into an RF signal for transmission?
Answer: Radio frequency transceiver
The RF transceiver (radio) modulates the digital baseband signal onto a carrier frequency and demodulates received RF signals back to digital data.
Which hardware component is responsible for managing the RF environment by dynamically adjusting AP power and channel settings?
Answer: Wireless LAN controller with RRM
Radio Resource Management (RRM) is a WLC feature that automatically optimizes channel assignments and transmit power to minimize interference and maximize coverage.
An outdoor WLAN deployment requires an antenna with 20 dBi gain to cover a long, narrow corridor between buildings. Which antenna type is most appropriate?
Answer: Highly directional Yagi or parabolic antenna
Yagi or parabolic dish antennas provide very high gain and a narrow beamwidth, making them ideal for point-to-point or long-range directional links.
What is the role of the CAPWAP (Control and Provisioning of Wireless Access Points) protocol in a WLAN deployment?
Answer: Provides the tunnel between lightweight APs and the WLC
CAPWAP is the standard protocol (RFC 5415) that creates a tunnel between lightweight APs and the WLC to carry both control messages and data traffic.