Free Cisco 300-425 Practice Questions 2026 | Designing Cisco Enterprise Wireless Networks (ENWLSD)

Explanation:

Why B is Correct?

Receiver sensitivity measures a device’s ability to detect weak signals (lower values = better performance).

The application requires a minimum received signal strength (RSSI) of -73 dBm. To ensure reliable coverage, the survey device must match or exceed the worst-case client sensitivity.

Using a device with the lowest (most negative) sensitivity (e.g., -90 dBm) ensures the survey accounts for all client types, including weaker ones.

Reference: CWNP Guide to Receiver Sensitivity.

Why Other Options Are Incorrect?

C. Most updated wireless card: Irrelevant—sensitivity is hardware-dependent, not driver-dependent.

D. 802.11a support: Outdated (5 GHz-only) and unrelated to sensitivity.

Key Survey Principle:

Design for the weakest client: Survey with a device that has equal or worse sensitivity than the target devices to guarantee universal coverage.

Reference:

IEEE 802.11 Standard: Defines receiver sensitivity thresholds for client devices.

Final Note:

B ensures the survey meets the application’s -73dBm requirement. Options A/C/D risk under-designing coverage. Always test with the least capable client.

Explanation:

Why C is Correct?
The RSSI slider in survey tools (e.g., Ekahau, AirMagnet) allows the engineer to dynamically adjust the displayed signal strength range on the heatmap.

By setting a cutoff filter (e.g., -67 dBm), the heatmap will only show areas meeting or exceeding that RSSI, highlighting valid coverage zones and hiding weaker/noisy signals.

This directly addresses the requirement to visualize only the desired coverage.

Reference: Ekahau Heatmap Documentation.

Why Other Options Are Incorrect?

A. Changing the color scheme: Only alters visualization aesthetics—does not filter out undesired signal levels.

B. RSSI calibration tool: Adjusts device sensitivity during data collection, not post-survey heatmap filtering.

D. Filtering APs: Shows/hides specific APs but does not isolate coverage by signal strength.

Steps to Achieve Desired Coverage Visualization:

Open the survey tool’s heatmap view.

Locate the RSSI slider (often labeled "Signal Strength Range").

Set the minimum cutoff (e.g., -70 dBm) to hide weaker signals.

Reference:

CWNP Passive Survey Best Practices: Recommends RSSI filtering for actionable coverage reports.

Final Note:

C is the only method to isolate desired coverage. Options A/B/D are either cosmetic or unrelated to signal strength filtering. Always validate coverage against design thresholds.

Explanation:

Why B is Correct?

AP Fallback determines whether an AP automatically returns to its primary controller after a failover event.

The customer wants manual intervention before the AP reverts to its designated controller, so disabling fallback is required.

This ensures the AP stays on the backup controller until administrators manually reassign it.

Reference: Cisco WLC AP Fallback Configuration.

Why Other Options Are Incorrect?

A. Set AP fallback to enabled: Would cause the AP to automatically return to its primary controller, violating the customer’s requirement.

C. Change the HA SKU secondary unit option: Irrelevant—this relates to controller redundancy licensing, not AP behavior.

D. Change the default mobility domain: Affects roaming between controllers but does not control AP fallback.

Steps to Implement:

Access the Cisco WLC CLI or GUI.

Navigate to Wireless > Access Points > High Availability.

Reference:

Cisco Wireless LAN Controller Configuration Guide, Release 8.5: Details AP fallback behavior.

Final Note:

B is the only solution meeting the customer’s requirement. Options A/C/D either conflict with the goal or address unrelated features. Always verify post-configuration AP behavior.

Explanation:

Why A is Correct?

Category 5e (Cat5e) cable supports 5Gbps (mGig) speeds but only up to 100 meters (328 ft) for 1Gbps Ethernet (802.3ab).

For 5Gbps (802.3bz), the maximum reliable distance is reduced to ~70 meters due to higher frequency signal attenuation.

The Cisco Aironet 3800 Series APs with mGig switches require this shorter distance for stable 5G operation.

Reference: IEEE 802.3bz Standard (5Gbps over Cat5e).

Why Other Options Are Incorrect?

B. 120 m / C. 130 m / D. 150 m: Exceed the 5Gbps limit for Cat5e, risking signal degradation, packet loss, or link failure.

Key Considerations:

For 5Gbps mGig:

Cat5e max = ~70 m (5Gbps)

Cat6 max = 100 m (5Gbps)

For 1Gbps: Cat5e supports 100 m.

Reference:

Cisco Aironet 3800 Deployment Guide: Recommends Cat6 for mGig but notes Cat5e limits.

Final Note:

A (70 m) is the only safe choice for 5G over Cat5e. Longer distances (B/C/D) risk performance drops. Always validate cable quality with testing.

Explanation:

Why A is Correct?

Cisco Workgroup Bridges (WGBs) support a maximum of 20 wired clients when operating in Universal WGB mode (the only mode that allows both wired and wireless clients).

The spare radio (typically the 5 GHz radio) connects wireless clients, while the primary radio (2.4 GHz or 5 GHz) connects to the upstream AP.

Reference: Cisco Workgroup Bridge Configuration Guide.

Why Other Options Are Incorrect?

B. 25 / C. 30 / D. 35: Exceed Cisco’s documented limit for wired clients on a WGB.

Key Notes:

Universal WGB Mode: Required for both wired and wireless clients.

Wired Client Limit: Hard-capped at 20 due to performance and MAC address table constraints.

Reference:

Cisco Aironet 3800/2800 Series WGB Datasheet: Confirms the 20-client limit.

Final Note:

A (20) is the only valid answer. Options B/C/D are unsupported. Always verify WGB mode and firmware versio

Explanation:

Why B is Correct?

Office cubicle environments are characterized by absorption due to:

Partition walls (fabric, drywall, glass).

Furniture (chairs, desks, cabinets).

These materials absorb RF signals, reducing signal strength and coverage range.

Reference: CWNP RF Propagation Basics.

Why Other Options Are Less Relevant?

A. Reflection: Occurs with hard surfaces (e.g., concrete, metal) but is secondary in cubicle-heavy offices

C. Noise: Caused by interference (e.g., microwaves, Bluetooth) but is not a propagation attenuation factor.

D. Refraction: Bending of signals through mediums (e.g., glass)—rarely a primary concern in cubicles.

Key Attenuation Factors in Cubicles:

Partition walls: ~3–6 dB loss per wall.

Human presence: ~3 dB absorption per person.

Reference:

Cisco Wireless Design Guide: Recommends higher AP density for cubicle environments.

Final Note:

B (absorption) is the dominant factor. Options A/C/D are either secondary or unrelated. Always conduct a site survey to measure actual attenuation.n.

Explanation:

Why D is Correct?

A comprehensive wireless network supporting data, voice, and location services requires both indoor and outdoor AP placement to ensure:

Seamless coverage: Voice and data require consistent signal strength indoors (e.g., offices, hallways) and outdoors (e.g., courtyards, parking lots).

Location accuracy: Indoor/outdoor APs enable triangulation for asset tracking (e.g., RFID, Wi-Fi tags).

Reference: Cisco High-Density Wireless Design Guide.

Why Other Options Are Incorrect?

A. Corner only / B. Perimeter and corner / C. Perimeter only: These are partial deployments that miss critical areas (e.g., central indoor spaces, outdoor zones), degrading voice/location services.

Key Design Principles:

Indoor APs: High-density placement for cubicles, meeting rooms.

Outdoor APs: Cover open areas, ensuring mobility for voice/LBS.

Location Services: Use RF fingerprinting (indoor) and GPS/Wi-Fi hybrid (outdoor).

Reference:

CWNP Voice over Wi-Fi (VoWLAN) Guidelines: Recommends overlapping indoor/outdoor coverage for roaming.

Final Note:

D (indoor and outdoor) is the only holistic approach. Options A/B/C create coverage gaps. Always align AP placement with use-case requirements.

Explanation:

Why A is Correct?

QoS (Quality of Service) is critical for cloud-based real-time communication (e.g., VoIP, video conferencing) and email synchronization because it:

Prioritizes latency-sensitive traffic (e.g., voice/video packets over bulk data).

Minimizes jitter and packet loss, ensuring smooth user experience.

Without QoS, cloud applications suffer from lag, dropped calls, or delays.

Reference: Cisco Wireless QoS Design Guide.

Why Other Options Are Secondary?

B. Radio management: Optimizes RF performance but doesn’t prioritize traffic.

C. Interference mitigation: Reduces noise but doesn’t address application latency.

D. Fast secure roaming: Improves AP-to-AP handoffs but doesn’t prioritize cloud traffic.

Key QoS Configurations:

WMM (Wi-Fi Multimedia): Enable on WLANs for 802.11e prioritization.

DSCP Marking: Tag traffic at the AP/controller (e.g., EF for voice).

Bandwidth Reservation: Guarantee minimum bandwidth for real-time apps.

Reference:

IEEE 802.11e (WMM Standard): Defines QoS for Wi-Fi.

Final Note:

A (QoS) is mandatory for cloud apps. Options B/C/D are important but don’t directly improve real-time performance. Always test with traffic profiling tools.

Explanation:

Why A is Correct?

The Cisco autonomous AP can be configured as a Workgroup Bridge (WGB) to connect wired devices to the non-Cisco WLAN.

However, the 12-port switch alone cannot provide IP routing/NAT to share the WLAN’s internet connection with multiple wired clients.

A router is needed to: Assign local IP addresses (DHCP).

Route traffic between the WGB-connected switch and the WLAN.

Reference: Cisco Autonomous AP Workgroup Bridge Configuration.

Why Other Options Are Incorrect?

B. Transparent firewall: Filters traffic but doesn’t provide routing/DHCP.

C. Hub: Obsolete; cannot manage traffic or IP addressing.

D. Wireless controller: Unnecessary—autonomous APs don’t require a controller.

Setup Steps:

Configure the AP as a Universal WGB (supports wired clients).

Connect the switch to the WGB’s Ethernet port.

Connect the router to the switch to handle DHCP/routing.

Reference:

Cisco WGB Deployment Guide: Recommends a router for multi-client internet sharing.

Final Note:

A (router) is the only device enabling full connectivity. Options B/C/D lack critical routing functionality. Always test client connectivity post-configuration.

Explanation:

Why D, E, and F are Correct?

D (RSSI above threshold):

Client Band Select steers clients to 5 GHz only if the 5 GHz signal is strong enough (typically > RSSI threshold, e.g., -70 dBm).

E (Dual-band client):

Clients must support 5 GHz (802.11a/n/ac/ax) to connect to it. Single-band (2.4 GHz-only) devices cannot use 5 GHz.

F (802.11a enabled):

The WLAN must advertise 5 GHz support (via 802.11a/n/ac/ax) for clients to associate.

Why Other Options Are Incorrect?

A (Channel bonding): Affects throughput but not band steering.

B (Co-channel interference): Impacts performance but doesn’t prevent 5 GHz use.

C (UNII-2 extended channels): Optional for 5 GHz; clients can use other 5 GHz channels (e.g., UNII-1/3).

Key Band Select Requirements:

RSSI Threshold: Configured in WLC (e.g., config band select rssi-threshold -70).

Dual-Band Clients: Verify client capabilities (e.g., 802.11ac/ad).

5 GHz WLAN: Ensure 802.11a is enabled on the WLAN.

Reference:

Cisco Band Select Documentation.

Final Note:

D, E, and F are mandatory for 5 GHz band steering. Options A/B/C are unrelated or optional. Always verify client logs for band select failures.