JN0-452 Juniper Mist AI Wireless - Specialist (JNCIS-MistAI-Wireless) Free Practice Exam Questions (2026 Updated)

Text Description automatically generated with low confidence

According to the Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide2, a non-compliant AP is an AP that has a different hardware model than what is expected by the cloud configuration. This can happen when an AP is replaced with an incorrect model or when an AP is moved to a different site group that has a different hardware model requirement. The solution is to replace the AP with the correct hardware model.

The exhibit shows a graph of the client’s roaming history over time. The x-axis represents the time and the y-axis represents the access point ID. Each dot on the graph indicates a roam event where the client switched from one access point to another.

The graph shows that the client roamed between different access points multiple times within a short period of time. This indicates that the client was experiencing frequent roams between different access points, which could affect its network performance and user experience.

In this scenario, you would begin troubleshooting by checking the WLAN-level Pre-Shared Keys.

According to the Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide1, you can configure a time-based setting for WLAN-level Pre-Shared Keys (PSKs) that will reset the key after a specified interval. This feature is useful for enhancing security and preventing unauthorized access. If a user reports that the Wi-Fi worked for a week and now it does not work, you should check the WLAN-level PSK settings and see if the key has been changed.

In the Juniper Mist AI ecosystem, Service Level Expectations (SLEs) provide a proactive way to monitor the health of a wireless network from the perspective of the end-user. When investigating potential interference—whether it is from neighboring Wi-Fi networks or non-Wi-Fi sources like microwaves or motion sensors—the Capacity SLE is the primary metric to analyze. While interference certainly impacts the overall Throughput SLE, Mist categorizes the specific environmental factors that limit airtime availability under the "Capacity" umbrella.

The Capacity SLE tracks "user minutes" during which a client experiences a drop in available RF channel capacity. It is specifically designed to identify why a client might be struggling to transmit data despite having a strong signal. Within the Capacity SLE block, Mist provides granular classifiers that pinpoint the root cause of the capacity degradation. These classifiers include:

Wi-Fi Interference: This identifies airtime contention caused by other 802.11 networks (Co-Channel Interference or Adjacent Channel Interference).

Non-Wi-Fi Interference: This identifies energy from non-802.11 sources detected by the AP's dedicated scanning radio.

Client Count: High density leading to contention.

Client Usage: A single "bandwidth hog" consuming the available airtime.

By checking the Capacity SLE in the Mist dashboard before heading to a site, an administrator can see a historical timeline of interference events. If the "Wi-Fi Interference" or "Non-Wi-Fi Interference" classifiers show a high percentage of "Bad User Minutes," the administrator can confirm that the client's complaint is indeed valid. This allows for remote troubleshooting and may even enable the admin to resolve the issue by adjusting Radio Resource Management (RRM) settings or identifying a specific rogue device, potentially saving an unnecessary truck roll.

In Juniper Networks Mist AI Wireless, Marvis Minis are purpose-built synthetic clients designed to proactively validate end-user experience by continuously testing the network in the same way a real user device would. To accurately isolate the root cause of connectivity or performance issues, Marvis Minis follow a strict, layered verification sequence that mirrors the logical dependency of network services.

The verification process begins with DHCP. This is the foundational step because, without a valid IP address, no further network communication can occur. Marvis Minis first confirm that the client can successfully complete the DHCP exchange and obtain proper IP configuration, including subnet, gateway, and lease parameters.

Once DHCP is validated, Marvis Minis move to ARP verification. At this stage, the synthetic client confirms it can resolve the MAC address of the default gateway and communicate at Layer 2. ARP issues can prevent traffic from leaving the local network segment even when an IP address is present.

After Layer 2 and Layer 3 reachability are confirmed, Marvis Minis test DNS functionality. DNS resolution is critical for application access, as most modern applications rely on hostname resolution rather than raw IP addresses. Failed or slow DNS responses are a common cause of perceived “application outages.”

Finally, Marvis Minis validate the application layer. This includes testing reachability, response time, and success of specific application transactions such as HTTPS connections, SaaS access, or internal application availability. By the time application testing occurs, all prerequisite network services have already been verified.

The other options are incorrect because they test higher-layer services before validating lower-layer dependencies, which can lead to misleading conclusions. Mist’s ordered approach—DHCP → ARP → DNS → Application—ensures precise fault isolation and actionable insights, allowing Marvis AI to accurately pinpoint where the user experience is breaking down.

According to the Marvis - Mist document, Correlation is a category in Marvis’ troubleshooting response that shows when the AP went offline. Correlation shows the correlation between events and SLEs for a given client or AP.

According to the Marvis - Mist document, unhappy clients is a query that can be used in Marvis to identify users who cannot connect to the network. Unhappy clients shows a list of clients who have experienced poor service level expectations (SLEs) such as connection failures, coverage issues, or low throughput.

According to the Juniper Mist Wireless Deployment Service Datasheet1, a configuration template at the organization level can be applied to a site group, not to an individual site. Therefore, there is no option to mention the site in the config template at the organization level.

 According to the Data Rates - Mist document1, a honeypot AP is an AP that is not associated with your network, but broadcasts your corporate login page and WLAN name. This is a type of rogue AP that tries to trick users into connecting to it and revealing their credentials or other sensitive information.

In a traditional deployment, a Juniper Mist Access Point is a "cloud-first" device, meaning it expects a constant connection to the Mist Cloud to receive configuration updates and report telemetry. When performing an "AP-on-a-Stick" (APoS) site survey, the AP is often powered by a battery pack and moved to various locations where an active Ethernet backhaul or Internet connection is unavailable.3 To ensure the AP continues to broadcast the required SSIDs for signal measurement in this "disconnected" state, two specific settings must be adjusted within the Mist dashboard.

First, AP Config Persistence must be enabled. By default, Mist APs store their configuration in volatile memory; if an AP reboots (which happens when switching battery packs or moving locations) and cannot reach the Mist Cloud, it may fail to reload its previous configuration. Enabling Config Persistence ensures that the AP writes its current configuration to non-volatile flash memory, allowing it to boot up and start broadcasting the programmed SSIDs even in the absence of a cloud connection.4

Second, AP Uplink Monitoring must be disabled. Mist APs are designed with a safety mechanism where, if the AP loses its gateway connectivity (eth0 link or ping to the gateway), it will stop broadcasting SSIDs to prevent "black-holing" client traffic. In a site survey scenario, the Ethernet port is typically connected only to a battery or a passive PoE injector with no data path.5 If Uplink Monitoring remains active, the AP will detect the lack of a backhaul and disable its radios, making the survey impossible. By disabling this feature, the AP is forced to keep its radios active regardless of the uplink status. Together, these two settings allow the AP to function as a standalone signal source, which is essential for accurate RF environment mapping and pre-deployment validation using Mist AI hardware.

the Post-Install user role is also known as Installer role, which has a minimum level of access to the org, sites, and APs. It can do the initial installation such as claim AP to Org, assign/unassign AP, or place on map, etc., but cannot unclaim or remove the AP from the Org. Site and AP access is allowed based on timed grace period and/or explicit site access.

https://www.mist.com/documentation/mist-ai-mobile-app/

 According to the Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide1, RF templates are assigned to sites, which are logical groupings of devices based on physical location or other criteria. RF templates allow you to configure RF parameters such as channel width, transmit power, and data rates for multiple devices at once.

In the Juniper Mist AI ecosystem, troubleshooting the mobility experience of a user requires analyzing the transitions between Access Points (APs). When a client reports a "poor experience when moving," it almost always points to a breakdown in the roaming process, such as sticky clients (devices that refuse to move to a closer AP), slow handoffs, or authentication failures during a roam. The Marvis Query Language (MQL) provides a conversational and structured way to extract this specific data using the ROAMINGOF clause.

The ROAMINGOF clause is designed to filter the massive amount of telemetry collected by Mist and focus specifically on the events surrounding a client's transition from one radio to another. When you execute a query like "Roaming of [Client Name]," Marvis returns a detailed visualization of the client's journey. This includes the signal strength (RSSI) at the time of the roam, the duration of the handoff, and whether the roam was "successful," "slow," or "failed".

By using this clause, an administrator can quickly identify if the "poor experience" is caused by poor overlap (where RSSI drops too low before a new AP is found) or if the client is holding onto a distant AP (sticky client behavior). Other clauses like STATUSOF (A) are used for general health checks, UTILIZATIONOF (C) tracks radio or site traffic levels, and RANK (D) is typically used to identify the best or worst performing entities (like "Rank APs by interference"). Only ROAMINGOF provides the temporal and spatial correlation needed to fix issues specifically related to user movement within the office environment.

 The AP Offline Marvis Action will consider all APs assigned to sites that have connected to the cloud previously for inclusion. So the correct answer is A. all APs assigned to sites that have connected to the cloud previously.

To review and troubleshoot the roaming activity of a specific client within a Juniper Mist environment, administrators rely on the conversational and analytical power of the Marvis Virtual Network Assistant (D) and its underlying Marvis Query Language (C). While other Marvis components like Actions focus on organization-wide health and Minis focus on synthetic testing, the VNA and MQL are specifically designed for deep-dive investigations into individual client experiences.

The Marvis Virtual Network Assistant (VNA) serves as the primary interface for this task. It allows an administrator to interact with the Mist AI using natural language. By typing a request such as "Troubleshoot client [Client Name]" or "How was the roaming for [Client Name]?", Marvis VNA aggregates all relevant telemetry data—including signal strength (RSSI), AP transitions, and authentication timings—into a simplified, human-readable summary. It provides a visual timeline of where the client moved and whether each roam was successful, slow, or failed.

Behind the scenes, these natural language requests are often converted into or powered by the Marvis Query Language (MQL). MQL is a structured way to query the Mist Graph API. For specific roaming reviews, the ROAMINGOF clause is used to filter the massive Mist data set for events related only to that client's mobility. For example, a query like roaming of "User-1" during last 24 hours will return a detailed data set showing the "From AP" and "To AP" details, the delta in signal strength during the handoff, and any associated latency.

By using these two features together, administrators can distinguish between a "sticky client" (one that refuses to roam despite a better signal being available) and a "coverage hole" (where the signal drops too low before a new AP is detected). This AI-driven approach eliminates the need for manual packet captures or log parsing, significantly reducing the Mean Time to Repair (MTTR) for mobility-related issues.

In the Juniper Mist dashboard, the Marvis Actions page serves as a centralized "proactive inbox" that identifies critical issues across the organization. However, the depth of information and the ability to interact with these findings are strictly tied to the Marvis Virtual Network Assistant (VNA) subscription.

The Mist dashboard provides a basic level of visibility even without a full Marvis license, allowing administrators to see that certain high-level categories (such as AP, Switch, or Gateway) have identified issues. This is designed to demonstrate the value of the AI engine. However, when you see a lock symbol next to sub-categories or specific Marvis Actions, it indicates that the organizational account does not have an active Marvis VNA subscription for those specific devices.

Without the subscription, the system will not permit the user to "drill down" into the root cause analysis, view historical event timelines, or access the specific remediation steps suggested by the AI. For example, while a standard Wi-Fi Assurance license might show that an AP is offline, the Marvis VNA subscription is what enables the detailed investigation—such as determining if the offline status is due to a cable failure, a bad PoE port on a switch, or a firmware mismatch.

To unlock these features and remove the lock symbols, a SUB-VNA (Virtual Network Assistant) subscription must be applied to the access points in the site. Once licensed, Marvis can provide full "conversational AI" capabilities, allowing you to ask natural language questions about the APs and giving you the interactive tools needed to resolve the issues identified in the Actions dashboard. Therefore, the presence of the lock icon is a direct indicator of a missing or expired subscription tier required for advanced AI-driven troubleshooting.

In Juniper Networks Mist AI Wireless, WxLAN policies are evaluated using a top-down, first-match logic. This means that when traffic matches a policy condition, that policy is applied immediately, and no further policies are evaluated. Understanding this evaluation order is critical when troubleshooting access discrepancies between user types such as BYOD and guest users.

From the scenario and the exhibit, guest devices are able to access youtube.com, while BYOD devices are blocked. This indicates that:

The guest WxLAN policy allows “All Video and Music” traffic (which includes YouTube).

The BYOD WxLAN policy blocks “All Video and Music” traffic.

The BYOD policy is evaluated before the guest policy.

Because BYOD users are matched to the BYOD label, their traffic hits the BYOD policy first and is denied before it can reach the more permissive guest policy. Simply modifying labels or deleting policies is unnecessary and could introduce unintended access control issues.

The correct and least disruptive solution is to move the BYOD WxLAN policy above the guest policy and then adjust the BYOD policy rules (for example, allowing YouTube or the “All Video and Music” category). By reordering the policies, you ensure that BYOD traffic is evaluated correctly and receives the intended permissions without impacting guest access.

The incorrect options are explained as follows:

Deleting policies (Options A and C) is not best practice and risks breaking segmentation and access control.

Option B is irrelevant, as the contractor policy does not affect BYOD or guest traffic in this scenario.

Therefore, the correct solution is to move the WxLAN policy for BYOD above the policy for guests, making Option D the correct answer.