Free Practice Questions for CWNP CWDP-305 Exam

When designing a WLAN for applications like Telnet, which are sensitive to latency and require consistent connectivity, it's crucial to minimize co-channel interference.Reducing the AP transmit power helps in creating smaller cells, thereby limiting the overlap between adjacent APs operating on the same channel.This approach reduces contention and interference, ensuring a more stable and reliable connection for latency-sensitive applications.

Comprehensive and Detailed Explanation:

An elevation chart provides a vertical radiation pattern of an antenna, which is essential for understanding how the antenna directs energy above and below the horizon. In bridge link deployments, especially over varying terrains or between buildings of different heights, the elevation pattern helps in aligning antennas to ensure optimal signal propagation and reception. Requesting elevation charts from antenna vendors allows for informed decisions on antenna placement and orientation, leading to more reliable and efficient wireless links.

To determine the minimum RSSI required for a VoWLAN deployment with a specified SNR, use the formula:

Minimum RSSI = Noise Floor + Required SNR

Given:

Required SNR = 25 dB

Noise Floor = -88 dBm

Calculation:

Minimum RSSI = -88 dBm + 25 dB = -63 dBm

Thus, the minimum RSSI needed is -63 dBm.

Explanation with Extract:

Per the *CWDP-305 Study Guide*, Voice over WLAN (VoWLAN) deployments require robust signal quality. The SNR is critical for voice performance, and the guide specifies:

"For VoWLAN, an SNR of 25 dB is typically required to ensure clear voice quality and minimal latency."

"The minimum RSSI is derived by adding the required SNR value to the measured noise floor."

This aligns with RF fundamentals where SNR is the difference between the received signal strength (RSSI) and the ambient noise floor. A higher SNR (e.g., 25 dB for voice) demands a stronger signal relative to noise. Here, a noise floor of -88 dBm plus 25 dB SNR results in -63 dBm RSSI (Option D).

Why other options fail:

A. -70 dBm: Results in 18 dB SNR (−70 − (−88) = 18 dB), insufficient for VoWLAN.

B. -67 dBm: Yields 21 dB SNR (−67 − (−88) = 21 dB), below the 25 dB requirement.

C. -65 dBm: Provides 23 dB SNR (−65 − (−88) = 23 dB), still inadequate.

Comprehensive and Detailed Explanation:

When transitioning from a centralized to a distributed data forwarding model in a WLAN architecture, it's important to consider the capabilities of the existing APs. Some APs designed specifically for centralized forwarding may lack the necessary hardware or firmware support to operate effectively in a distributed forwarding mode. This can lead to compatibility issues and may require hardware upgrades or replacements to ensure proper functionality in the new architecture.

Comprehensive and Detailed Explanation:

Short ASCII passphrases, especially those 12 characters or fewer, are more vulnerable to dictionary attacks. Attackers can use precomputed tables or brute-force methods to guess these passphrases, especially if they are common or simple. The WPA/WPA2-Personal security model relies on the strength of the passphrase; thus, longer and more complex passphrases significantly enhance security.

Option B:The strength of group keys in a BSS is not directly affected by the length of the passphrase but rather by the encryption protocols in use.

Option C:Regardless of the passphrase length, the Pairwise Master Key (PMK) derived is 256 bits.

Option D:Most AP and client vendors support ASCII-based passphrase entry, making this option incorrect.

CAPWAP (Control and Provisioning of Wireless Access Points):Modern standard protocol for tunneling management and data frames between APs and WLCs.

GRE (Generic Routing Encapsulation):Sometimes used by vendors as an alternative tunneling method, especially for data transport.

From CWDP-305:

“CAPWAP is the most widely used protocol for communication between access points and controllers. GRE is also utilized in some vendor implementations for tunneling user data.”

— Reference: CWDP-305 Official Study and Reference Guide, Chapter on Infrastructure Design

Comprehensive and Detailed Explanation:

IEEE 802.3at, also known as PoE+, provides up to 30 watts of power per port. To calculate the minimum Power over Ethernet (PoE) budget required for 6 access points (APs):

30 W/AP × 6 APs = 180 W

Therefore, a switch must have a minimum PoE budget of180 wattsto support six 802.3at-powered APs.

DHCP Option 43 is a vendor-specific option used by lightweight access points to locate their Wireless LAN Controller (WLC) when no static discovery method (like DNS or manual config) is provided. During the DHCP request process, the AP receives Option 43 information that includes the WLC’s IP address. This is a standard method in controller-based WLAN deployments and is explicitly called out in the CWDP-305 Study Guide.

If the number of APs changes due to budget constraints, a complete redesign is required to reevaluate coverage, capacity, and performance expectations. Increasing transmit power or relying on 2.4 GHz is not a valid solution, as it can result in co-channel interference and poor roaming.

From CWDP-305:

“A design is based on specific coverage and capacity requirements. Any major change, such as reducing the number of APs, requires a full redesign to determine the impact and ensure that business requirements can still be met.”

— Reference: CWDP-305 Official Study and Reference Guide, Chapter on Wireless Design Process

EAP-TLS (Extensible Authentication Protocol-Transport Layer Security) is considered one of the most secure EAP methods. It requires both the client and the server to have certificates, enabling mutual authentication. This method eliminates the need for passwords, reducing the risk of credential theft.

EAP-TTLS allows for server-side certificates and can use passwords for client authentication, making it less secure than EAP-TLS.

PEAP encapsulates EAP within a TLS tunnel, typically using server certificates and password-based client authentication.