What does the CCNP wireless design concentration exam cover?
The CCNP Enterprise Wireless Design (300-425 ENWLSD) concentration exam covers enterprise wireless network design including site survey methodology, wireless architecture, high availability, roaming, location services, and performance design for high-density environments. It completes CCNP Enterprise certification alongside the ENCOR core exam and costs $300 USD.
The Cisco CCNP Enterprise 300-425 ENWLSD (Designing Cisco Enterprise Wireless Networks) concentration exam validates advanced wireless design skills for enterprise environments. It is the design-focused wireless concentration for CCNP Enterprise, emphasizing the planning and architecture decisions rather than hands-on configuration.
Enterprise wireless engineers with CCNP Enterprise certification specializing in wireless design are in high demand as organizations deploy Wi-Fi 6 and 6E infrastructure to support high-density applications, IoT devices, and location services. The exam costs $300 USD and is 90 minutes long.
Exam Overview
| Detail | Information |
|---|---|
| Exam Code | 300-425 ENWLSD |
| Full Name | Designing Cisco Enterprise Wireless Networks |
| Number of Questions | 55-65 |
| Time Limit | 90 minutes |
| Passing Score | ~825/1000 |
| Cost | $300 USD |
| Prerequisites | ENCOR 350-401 core exam must be passed |
| Certification | Completes CCNP Enterprise with ENCOR |
The exam covers five domains:
- Site survey (25%)
- Wired and wireless infrastructure (20%)
- Mobility (20%)
- WLAN high availability (15%)
- AP deployment models (20%)
"ENWLSD is fundamentally a design exam, not a configuration exam. Questions describe a business requirement -- 5,000 concurrent clients in a stadium, predictive location services with 3-meter accuracy, seamless voice roaming between buildings -- and you must select the architectural approach, antenna type, deployment density, and technology that satisfies all stated requirements simultaneously." -- CCNP wireless specialist community
Domain 1: Site Survey (25%)
Types of Wireless Site Surveys
Predictive site survey: Using RF planning software (Ekahau, iBwave) to model signal propagation in a floor plan without physically visiting the site. Creates a virtual model of the deployment before hardware is ordered. Best used for initial budgeting and pre-deployment validation.
Passive survey: Walking the coverage area with a laptop or dedicated survey device that passively listens and records existing RF signals. Does not require associating with an AP. Used for measuring existing coverage, interference sources, and signal-to-noise ratios.
Active survey: Walking the coverage area while associated to an AP, measuring actual throughput and connection quality. More representative of real user experience than passive surveys.
Post-deployment validation survey: Conducted after installation to verify the deployment meets design requirements. Identifies coverage gaps, interference issues, and co-channel interference.
RF Planning Tools
Ekahau Site Survey and iBwave Wi-Fi are the industry-standard tools for predictive wireless design. Key capabilities:
- Import CAD or PDF floor plans
- Define construction materials with known attenuation values
- Place virtual APs and simulate RF propagation
- Generate heat maps for signal strength, SNR, and channel utilization
- Calculate AP count and placement for coverage and capacity targets
Antenna Selection
| Antenna Type | Pattern | Use Case |
|---|---|---|
| Omnidirectional | 360 degrees horizontal | Open office, warehouse ceiling mount |
| Directional patch | Narrow horizontal beam | Covering long corridors or outdoor areas |
| High-gain directional | Very narrow beam | Point-to-point bridge links |
| Sector antenna | 60-120 degree sector | Outdoor campus coverage, stadium sectors |
| Internal AP antenna | Integrated omni | Standard office deployment |
Domain 2: Wired and Wireless Infrastructure (20%)
Controller Deployment Models
| Model | Controller Location | Best For |
|---|---|---|
| Centralized (local mode) | On-premises data center | Single-campus, low-latency WAN |
| Distributed (FlexConnect) | AP handles local switching | Branch offices with WAN constraints |
| Cloud-managed (Meraki) | Cisco cloud | Multi-site, minimal on-prem infrastructure |
| Embedded (Mobility Express) | AP acts as controller | Small branch, <50 APs |
| Cisco Catalyst Center | On-premises management | Enterprise with SD-Access fabric integration |
Capacity Planning
For high-density wireless environments, capacity planning requires:
- Determine expected client count: Peak concurrent clients per area
- Determine application requirements: Minimum bandwidth and latency per user type
- Calculate throughput requirement: Total throughput = clients x per-client bandwidth requirement
- Select AP model: Based on throughput capacity per AP and spatial streams
- Determine co-channel interference strategy: Cell size reduction, channel reuse pattern
Cell size reduction is the primary technique for high-density design:
- Reduce transmit power to decrease cell size
- Deploy more APs closer together with smaller coverage footprints
- Use 5 GHz band preferentially (more channels, less interference)
- Enable band steering to push capable clients to 5 GHz
Domain 3: Mobility (20%)
Roaming Protocols
Basic roaming (within the same controller): Client roams between APs on the same WLC. The WLC maintains client state; roaming is seamless.
Inter-controller roaming: Client roams between APs on different WLCs in the same mobility group. Mobility group configuration ensures controllers share client session information.
802.11r Fast BSS Transition (FT): Reduces roaming time for voice clients by pre-authenticating to the target AP before leaving the current AP. Critical for voice over Wi-Fi applications requiring sub-50ms roaming.
802.11k Neighbor Reports: APs advertise their neighbors to associated clients, allowing clients to quickly identify roaming candidates without full channel scans.
802.11v BSS Transition Management: Network-side roaming optimization allowing APs to suggest (or request) that clients roam to a better-suited AP.
Cisco Mobility Architecture
Cisco Mobility Express and Catalyst 9800 WLC support mobility domains where controllers share client information. Key concepts:
- Anchor controller: Handles client authentication and maintains the client binding (home controller)
- Foreign controller: The WLC currently serving the client when roaming
- Mobility tunnels: EoIP or CAPWAP tunnels carrying client traffic between foreign and anchor controllers
Domain 4: WLAN High Availability (15%)
Controller High Availability
Cisco HA (High Availability) SSO (Stateful Switchover): Pairs two Catalyst 9800 WLC units for active/standby redundancy with sub-second failover. The standby controller mirrors all client state from the active controller, enabling seamless failover without client re-authentication.
N+1 redundancy: N active controllers plus one spare controller. Less expensive than HA SSO but requires client re-association during failover.
AP High Availability
AP fallback: APs can be configured with a primary, secondary, and tertiary WLC. If the primary WLC becomes unavailable, the AP falls back to the secondary within the configured timer.
FlexConnect AP independence: FlexConnect APs continue forwarding client traffic locally even when the WLC connection is lost, preventing complete wireless outage during WAN failures.
Domain 5: AP Deployment Models (20%)
Outdoor Wireless Design
Outdoor wireless deployments have different requirements from indoor:
- Weatherproofing: Outdoor APs must withstand temperature ranges, humidity, rain, and wind
- Power: Extended PoE or external power for outdoor AP placement
- Mounting: Pole mounting, wall mounting, or mast attachment for optimum coverage
- Antenna selection: High-gain directional antennas for point-to-multipoint coverage; sector antennas for broad outdoor areas
Cisco Catalyst outdoor APs (1500 series and newer) are designed for outdoor environments and support the same management platform as indoor APs.
Location Services
Cisco Spaces (formerly DNA Spaces / CMX - Connected Mobile Experiences) provides:
- Asset tracking using Wi-Fi RSSI from multiple APs
- Client location analytics (heat maps of where people spend time)
- Proximity services (notifications when clients enter defined zones)
Location accuracy depends on AP density:
- RSS-based location: 5-15 meter accuracy typical with standard AP density
- Angle-of-arrival (AoA) using Cisco Wi-Fi 6E APs: Sub-meter accuracy possible with Wi-Fi 6E APs that support fine-grained AoA
Wi-Fi 6 and Wi-Fi 6E Design Considerations
Wi-Fi 6 (802.11ax) improvements relevant to enterprise design:
- OFDMA: Allows a single AP to serve multiple clients simultaneously in the same channel, improving efficiency in high-density environments
- BSS Coloring: Reduces co-channel interference by enabling APs on the same channel to differentiate each other's transmissions
- Target Wake Time (TWT): Reduces IoT device power consumption by scheduling when devices wake to transmit
Wi-Fi 6E adds the 6 GHz band:
- 1200 MHz of additional spectrum (compared to 80 MHz for 2.4 GHz and 500 MHz for 5 GHz)
- No legacy devices (only Wi-Fi 6E-capable devices can use 6 GHz)
- 14 additional non-overlapping 80 MHz channels or 7 additional 160 MHz channels
- Currently requires WPA3 for security (no legacy authentication)
Frequently Asked Questions
What is the difference between ENWLSD and ENWLSI? ENWLSD (300-425) is the wireless design concentration exam focusing on architecture decisions, site survey methodology, capacity planning, and technology selection. ENWLSI (300-430) is the wireless implementation concentration focusing on configuring and troubleshooting Cisco wireless infrastructure. Many wireless engineers pursue both to earn the CCNP Enterprise certification with comprehensive wireless expertise.
Do I need Ekahau or iBwave software to prepare for ENWLSD? Familiarity with predictive survey tools is helpful for ENWLSD preparation but you do not need a licensed copy. Ekahau offers a free viewer and trial version. Understanding the workflow (importing floor plans, placing APs, interpreting heat maps) is tested conceptually. Cisco dCloud provides free access to wireless planning lab environments that include survey tool simulations.
Is ENWLSD relevant for Wi-Fi 6 and 6E deployments? Yes, Cisco updates the ENWLSD exam to include current wireless technologies. Wi-Fi 6 design considerations (OFDMA, BSS coloring, high-density design) and Wi-Fi 6E (6 GHz band planning) are included in the current exam objectives. The design principles tested in ENWLSD directly apply to planning modern Wi-Fi 6 and 6E enterprise deployments.
References
- Cisco. (2025). 300-425 ENWLSD Exam Topics. https://learningnetwork.cisco.com/s/enwlsd-exam-topics
- Cisco. (2025). Cisco Catalyst 9800 Series Wireless Controller Documentation. https://www.cisco.com/c/en/us/support/wireless/catalyst-9800-series-wireless-controllers/
- Crow, B. (2022). CCNP Enterprise Wireless Design and Implementation. Cisco Press.
- Coleman, D., & Westcott, D. (2021). CWNA Certified Wireless Network Administrator Study Guide. Sybex.
- Ekahau. (2025). Wi-Fi Design and Site Survey. https://www.ekahau.com/
- Wi-Fi Alliance. (2025). Wi-Fi 6 and Wi-Fi 6E Technology Overview. https://www.wi-fi.org/discover-wi-fi/wi-fi-6