CWDP-305 Exam Dumps - CWNP CWDP Wi-Fi Design Questions and Answers

Microwave ovens operate at frequencies around 2.45 GHz, which can cause interference with Wi-Fi signals in the 2.4 GHz band. During lunch hours, increased use of microwaves in the break room can lead to intermittent Wi-Fi connectivity due to this interference.

Comprehensive and Detailed Explanation:

Co-Channel Interference (CCI) in the 2.4 GHz band can significantly degrade WLAN performance due to the limited number of non-overlapping channels available.If the WLAN was primarily designed for 5 GHz, the 2.4 GHz band serves as a secondary or best-effort option.In such cases, turning off 2.4 GHz radios on some APs can reduce CCI by minimizing overlapping coverage areas, thereby improving overall network performance.

Comprehensive and Detailed Explanation:

In scenarios where the 2.4 GHz radio is not used for standard access point operations, it can be repurposed for functions such as security monitoring. Utilizing the 2.4 GHz radio for monitoring allows the network to detect unauthorized devices, rogue APs, and potential security threats, thereby enhancing the overall security posture of the wireless network.

Comprehensive and Detailed Explanation:

For reliable Voice over Wi-Fi (VoWiFi) service, a minimum RSSI of -67 dBm is generally recommended. This level ensures sufficient signal strength to support the quality of service required for voice applications, providing adequate signal-to-noise ratio (SNR) and minimizing the likelihood of dropped calls or poor audio quality.

Comprehensive and Detailed Explanation:

Return loss measures how well devices or lines match impedance, with higher values indicating better matching and less signal reflection. When measuring return loss through a cable with known loss, the actual return loss of the antenna is calculated by subtracting twice the cable loss from the measured value:

Measured return loss = 20 dB

Cable loss = 2.5 dB

Actual return loss = 20 dB - (2 × 2.5 dB) = 15 dB

However, since the question states the measured value is "larger than 20 dB," let's assume it's, for example, 22.5 dB:

Actual return loss = 22.5 dB - (2 × 2.5 dB) = 17.5 dB

An actual return loss of17.5 dBis considered acceptable and indicates a reasonably good impedance match, minimizing signal reflections.

Centralized forwarding in WLAN architectures means that all client traffic is tunneled back to a central controller for processing.This design simplifies management and can enhance security but places significant demand on the network's infrastructure.

To support the increased traffic load resulting from centralized forwarding, it's essential to havehigh-speed Ethernet links, such as Gigabit or higher, especially between access points, switches, and controllers.This ensures that the network can handle the aggregated traffic without becoming a bottleneck.

A Physical Installation Guide is a critical document that provides detailed instructions for installation technicians on how to mount and configure Access Points (APs).It ensures that the deployment aligns with the design specifications and helps maintain consistency and quality across the installation process.

The CWDP-305 Official Study and Reference Guide states:

"Create, distribute, and communicate design documentation – Physical Installation Guide."

A Wireless Intrusion Prevention System (WIPS) is a network security solution that monitors wireless LANs for unauthorized or malicious activity and provides real-time or automated responses. WIPS can perform a wide array of functions as outlined below:

A. Distributed protocol analysis:

WIPS sensors continuously scan wireless traffic and analyze frames to detect anomalies or policy violations in real time.

C. Performance monitoring and response:

WIPS can identify degradation in WLAN performance due to interference, misconfiguration, or rogue activity and alert administrators or take corrective action.

D. Data forensics and analysis:

WIPS platforms often include historical logging and reporting features that allow administrators to review past events and understand the timeline and impact of wireless threats.

E. Automated threat mitigation:

WIPS can automatically respond to threats by sending deauthentication frames, blocking MAC addresses, or disabling ports to mitigate rogue devices or attacks.

Note:

B. Client access to the distribution system is not a function of WIPS; it refers to client functionality in a WLAN, not a security service offered by WIPS.

“A WIPS performs functions such as rogue detection and mitigation, threat classification, forensic logging, and real-time protocol analysis. It can provide both historical analytics and proactive security enforcement.”

— CWDP-305 Study Guide, Chapter on Post-Design ValidationandTroubleshooting

Comprehensive and Detailed Explanation:

Ensuring high availability in RF design involves strategies that provide redundancy and resilience:

C. Deploy using 100 percent overlap:Overlapping coverage areas between APs ensure that if one AP fails, clients can seamlessly connect to another, maintaining network availability.

E. Use dual spectrums:Utilizing both 2.4 GHz and 5 GHz bands allows for flexibility and redundancy. If one band experiences interference or congestion, clients can switch to the other.

A. Powering APs to maximum powercan lead to increased interference and is not a recommended practice for high availability.

B. HSRP/VRRP protocolsare related to router redundancy and do not directly impact RF availability.

D. Deploying 802.3afrefers to Power over Ethernet standards and, while important for powering devices, does not directly contribute to RF high availability.

Comprehensive and Detailed Explanation:

High Rate Direct Sequence Spread Spectrum (HR/DSSS) is associated with the IEEE 802.11b standard, which specifies the following physical layer (PHY) data rates:

1 Mbps and 2 Mbps:Achieved using Differential Binary Phase Shift Keying (DBPSK) and Differential Quadrature Phase Shift Keying (DQPSK) modulation techniques, respectively.

5.5 Mbps and 11 Mbps:Achieved using Complementary Code Keying (CCK) modulation, which allows higher data rates while maintaining robustness against interference.

These rates are specific to the 802.11b standard operating in the 2.4 GHz band.