JN0-452 Exam Dumps - Juniper JNCIS-MistAI Questions and Answers

According to the Virtual Network Assistant | Juniper Networks US document3, two SLEs that measure the amount of time that it takes for a process to complete are:

Roaming, which measures how long it takes for a client to switch from one AP to another without losing connectivity.

Time to Connect, which measures how long it takes for a client to complete all steps of network access such as authentication, DHCP, and DNS.

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.

Basic data rates are the required data rates that all devices on a wireless network must support in order to connect to the network. These rates are used for management and control frames and can affect the performance of the network.

According to the Lecture 3 - Radio Frequency and Antenna Fundamentals - Part 2 document2, basic data rates are required data rates that all devices must support to communicate on a WLAN.

In Juniper Networks Mist AI Wireless, Radio Resource Management (RRM) is designed to optimize RF performance automatically while minimizing client impact. With the introduction of Wi-Fi 6E and the 6 GHz band, Juniper Mist follows industry standards and client behavior to ensure efficient and reliable operation. By default, Mist RRM uses the Preferred Scanning Channels (PSCs) in the 6 GHz spectrum.

The 6 GHz band introduces a very large number of available channels, which creates challenges for client discovery, scanning efficiency, and roaming speed. To address this, the IEEE defined Preferred Scanning Channels (PSCs)—a specific subset of 6 GHz channels that access points advertise and clients prioritize during active and passive scanning. These PSCs allow clients to discover networks faster without having to scan the entire 6 GHz channel set.

Juniper Mist RRM automatically selects and operates on these PSCs by default to:

Improve client discovery and association times

Reduce unnecessary scanning overhead

Enhance roaming performance

Maintain compatibility across a wide range of Wi-Fi 6E client devices

Mist continuously evaluates RF conditions using telemetry and AI-driven analysis, but it intentionally limits default operation to PSCs to balance performance, efficiency, and client interoperability. Administrators can override defaults and customize channel plans if required, but PSCs remain the recommended baseline for most deployments.

The incorrect options are explained as follows:

Option B is incorrect because Mist RRM does not require manual primary channel selection by default.

Option C refers to 2.4 GHz non-overlapping channels, not 6 GHz.

Option D represents the full 6 GHz channel range, which is not practical for default scanning or operation due to client limitations.

Therefore, the correct answer is the preferred scanning channels (PSCs), which Juniper Mist RRM uses by default in the 6 GHz band to ensure optimal Wi-Fi 6E performance.

According to the Wi-Fi configuration with Mist Systems | HCD Consulting GmbH document, three available rate limiting options in the Mist UI are:

According to the Initial AP Connection and VLANs & Static IP addresses - Mist document1, when a Juniper Mist AP boots up for the first time, it will expect to see a trunked port or the native VLAN=1 and will send a DHCP request on that VLAN. The AP will attempt to connect to the Mist cloud using port 443, which is the default HTTPS port.

According to the Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide2, you can create a new site configuration under the location hierarchy level in the Juniper Mist UI. A site is a logical grouping of devices based on physical location or other criteria.

In the architecture of a Mist AI Real-Time Location System (RTLS), the process of moving from raw signal data to an actionable event involves several distinct layers. To understand why the location system is the correct answer, we must examine how Mist processes Location-Based Services (LBS).

The workflow begins with location sensors (typically Mist Access Points). these sensors collect raw Bluetooth Low Energy (BLE) or Wi-Fi signals (RSS measurements) from tracked assets or mobile devices. These raw data points are then transmitted to the cloud-based Mist AI engine. The location system (often referred to as the Location Engine within the Mist Cloud) is the specific functional component responsible for calculating the precise X/Y coordinates of the device using machine learning and trilateration algorithms.

However, its role does not end at mere coordinate calculation. The Mist location system is designed to be "context-aware." Once the coordinates are established, the system maps these coordinates against defined zones, virtual beacons (vBeacons), or geofences configured in the Mist dashboard. When a device’s coordinates intersect with a predefined boundary, the location system triggers a location-aware action. This could include sending a webhook to a third-party application, pushing a proximity notification to a mobile SDK client, or recording a "visit" in the analytics engine.

While Juniper Mist Edge handles data plane tunneling and Marvis Minis acts as a digital twin for network simulation, they do not manage the coordinate-to-action logic. The location system is the intelligence that bridges the gap between spatial data and business logic, ensuring that the right client receives the right trigger based on their physical presence within a venue.

According to the Lecture 3 - Radio Frequency and Antenna Fundamentals - Part 2 document3, two layers that are different between Ethernet and Wi-Fi in the OSI networking model are:

Media access control (MAC) sub-layer, which is part of the data link layer and defines how devices access and share the wireless medium.

Physical layer, which defines how data is encoded and transmitted over the wireless medium.