CWDP Wireless Network Design & Architecture — Questions and Answers
Question 1: What is the primary benefit of using a mesh network topology in wireless design?
- Reduces the need for wireless access points.
- Provides multiple redundant paths for data transmission. (Correct answer)
- Eliminates interference from other networks.
- Increases the range of a single access point.
Correct answer: Provides multiple redundant paths for data transmission.
A mesh network topology is characterized by multiple interconnected nodes, where each node can communicate with several others. This design creates numerous redundant pathways for data transmission, meaning if one path or node fails, data can automatically reroute through an alternative route, significantly enhancing network reliability and resilience.
Question 2: Which factor should be considered when determining access point placement in a wireless network?
- The color of the access point.
- Interference and physical obstructions. (Correct answer)
- The number of users on the network.
- The internet speed provided by the ISP.
Correct answer: Interference and physical obstructions.
When determining access point placement, it is critical to consider potential sources of interference (e.g., other Wi-Fi networks, microwaves) and physical obstructions (e.g., walls, metal objects). These factors can severely degrade signal quality, reduce coverage, and negatively impact the overall performance of the wireless network.
Question 3: What is a key advantage of using directional antennas in wireless network design?
- Covers all directions equally.
- Reduces interference and improves signal strength in a specific direction. (Correct answer)
- Requires fewer access points.
- Eliminates the need for RF planning.
Correct answer: Reduces interference and improves signal strength in a specific direction.
Directional antennas focus their radio frequency energy into a specific direction, creating a stronger signal lobe in that intended area while minimizing signal radiation elsewhere. This focused transmission reduces interference with other devices or networks and allows for stronger, more reliable connections over longer distances in the desired direction.
Question 4: Which protocol is commonly used for network authentication in enterprise wireless networks?
- 802.11ac
- 802.1X (Correct answer)
- WPA2-Personal
- DHCP
Correct answer: 802.1X
802.1X is an IEEE standard for port-based network access control, widely adopted in enterprise wireless networks for robust authentication. It provides a framework for authenticating users or devices before granting them access to the network, often leveraging a RADIUS server for centralized credential management and policy enforcement, ensuring secure access.
Question 5: What is the purpose of a site survey in wireless network design?
- To check internet speed at different locations.
- To analyze signal strength, interference, and coverage. (Correct answer)
- To determine ISP availability.
- To reduce the need for network security measures.
Correct answer: To analyze signal strength, interference, and coverage.
A wireless site survey is a crucial step in designing and deploying a Wi-Fi network. Its purpose is to physically assess the environment, measuring existing RF signals, identifying sources of interference, and determining optimal access point placement to ensure adequate signal coverage and performance throughout the desired area.
Question 6: Which factor has the most significant impact on network bandwidth in a wireless network?
- The physical size of the network area.
- The number of users and channel congestion. (Correct answer)
- The type of Ethernet cables used.
- The color of the access points.
Correct answer: The number of users and channel congestion.
In a wireless network, bandwidth is a shared resource among all connected devices. A higher number of users simultaneously accessing the network, combined with congestion on the chosen Wi-Fi channels due to other networks or devices, significantly reduces the available bandwidth for each user, leading to slower speeds and degraded performance.
CWDP Wireless Network Design & Architecture
What is the primary benefit of using a mesh network topology in wireless design?