CWS WLAN Hardware & Software Components 2 — Questions and Answers
Question 1: Which antenna type radiates power equally in all horizontal directions, making it ideal for general-coverage deployments?
- Directional antenna
- Yagi antenna
- Omnidirectional antenna (Correct answer)
- Parabolic dish antenna
Correct answer: Omnidirectional antenna
Omnidirectional antennas radiate power in a 360-degree horizontal pattern, providing uniform coverage in all directions around the antenna.
Question 2: What is the primary function of a wireless LAN controller (WLC) in a centralized architecture?
- Provide DHCP addresses to wireless clients
- Centrally manage and control lightweight access points (Correct answer)
- Encrypt data between the AP and client
- Act as a wireless repeater for extended range
Correct 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.
Question 3: A PoE switch port is rated at 802.3af. What is the maximum power it can deliver to a connected access point?
- 7.5 watts
- 15.4 watts (Correct answer)
- 30 watts
- 60 watts
Correct 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.
Question 4: What component in an access point converts the digital baseband signal into an RF signal for transmission?
- Antenna
- Radio frequency transceiver (Correct answer)
- Power over Ethernet injector
- Network interface controller
Correct 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.
Question 5: Which hardware component is responsible for managing the RF environment by dynamically adjusting AP power and channel settings?
- RADIUS server
- Wireless LAN controller with RRM (Correct answer)
- Layer 2 switch
- DNS server
Correct 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.
Question 6: 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?
- Omnidirectional dipole
- Patch/panel antenna
- Highly directional Yagi or parabolic antenna (Correct answer)
- Internal PIFA antenna
Correct 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.
Question 7: What is the role of the CAPWAP (Control and Provisioning of Wireless Access Points) protocol in a WLAN deployment?
- Encrypts 802.11 data frames between client and AP
- Provides the tunnel between lightweight APs and the WLC (Correct answer)
- Assigns IP addresses to wireless clients
- Manages DNS resolution for WLAN clients
Correct 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.
CWS WLAN Hardware & Software Components 2
Which antenna type radiates power equally in all horizontal directions, making it ideal for general-coverage deployments?