JN0-251 Practice Exam Questions with Answers Mist AI - Associate (JNCIA-MistAI) Certification

According to the [Service Level Expectations] page, Service Level Expectations (SLEs) are a set of metrics that measure the quality and performance of the wireless network from the user’s perspective. SLEs can help network administrators monitor, troubleshoot, and optimize their network by providing real-time and historical data and analytics. SLEs can also help network administrators identify and resolve issues before they impact the user experience.

There are seven SLEs that are supported by Mist: Successful Connects, Time to Connect, Capacity, Coverage, Throughput, Roaming, and WAN. Each SLE has a target value and a threshold value that can be customized according to the network requirements. The SLE score is calculated as the percentage of clients that meet or exceed the target value for each SLE.

Two SLEs that report DHCP problems are Successful Connects and Time to Connect. DHCP (Dynamic Host Configuration Protocol) is a protocol that assigns IP addresses and other network configuration parameters to devices on a network. DHCP problems can occur when a device fails to obtain an IP address from the DHCP server or when the DHCP server is slow or unreachable.

Successful Connects is an SLE that measures the percentage of clients that successfully connect to the wireless network within a specified time frame. Successful Connects can report DHCP problems by showing the number of clients that fail to connect due to DHCP errors, such as DHCP timeout, DHCP NAK, or DHCP decline. Successful Connects can also show the root cause analysis and recommended actions for resolving DHCP problems.

Time to Connect is an SLE that measures the average time it takes for a client to connect to the wireless network from the moment it sends a probe request to the moment it receives an IP address from the DHCP server. Time to Connect can report DHCP problems by showing the breakdown of the connection time into different stages, such as probe, auth, assoc, EAPOL, and DHCP. Time to Connect can also show the outliers and trends for each stage and identify if there are any delays or failures in the DHCP process.

WAN Assurance is a cloud-based service that provides visibility and insights into the WAN performance and user experience. WAN Assurance supports two device categories: SSR and SRX. SSR stands for Session Smart Router, which is a software-defined WAN (SD-WAN) solution that delivers high-performance, secure, and reliable connectivity for distributed enterprises. SRX stands for Services Gateway, which is a next-generation firewall (NGFW) that provides advanced security and threat prevention for branch and remote locations.

WAN Assurance does not support EX or Mist Edge devices. EX is a series of Ethernet switches that provide high-performance, scalable, and secure switching for campus and data center networks. Mist Edge is a device that extends the Mist Cloud to the edge of the network, enabling local processing of WLAN functions, such as authentication, encryption, and firewall.

You can find more information about WAN Assurance in the Juniper TechLibrary1 or the Juniper Mist WAN Assurance Overview2.

You want to determine where you have coverage issues in your network using Marvis Actions. The Marvis Action category that you should use in this situation is AP. The AP category contains actions that are related to the access points on your network, such as offline APs, health check failed APs, non-compliant APs, and coverage hole APs.

The coverage hole AP action will detect any coverage issues on your site and provide a floorplan visual of the APs on your map experiencing these issues. You can use this visual to find the low coverage spaces identified on your site and make the necessary improvements. You can also view the details of the coverage hole action, such as the number of affected clients, the average RSSI, and the root cause classifier.

To access the AP category of Marvis Actions, you need to navigate to Marvis > Actions and select the AP tab. You will see a list of all the AP actions that are detected on your network. You can filter and sort the actions by various criteria, such as site, severity, status, or date. You can also perform actions on the APs, such as upgrade, RMA, or block.

According to the web search results, Mist AP packet capture is a feature that allows you to capture packets from a specific AP or client and analyze them using a tool such as Wireshark1. Packet capture can help you troubleshoot and diagnose various wireless issues, such as DHCP errors, authentication failures, or roaming problems1. You can configure a wired or wireless packet capture manually by using the Mist portal or the Mist AI app23.

To configure a wired packet capture manually, you can go to Network > Packet Captures in the Mist portal and select the AP and the TCP dump expression that you want to capture packets for2. The TCP dump expression is a filter that specifies the type, source, destination, and port of the packets that you want to capture2. You can use the TCP dump expression builder to create your expression or edit it directly if you are familiar with the syntax2. You can also adjust the packet capture settings, such as the number of packets, duration, and maximum packet length2. Once you start the capture, you can download the PCAP file and open it in Wireshark for analysis2.

To configure a wireless packet capture manually, you can go to Network > Packet Captures in the Mist portal and select the AP and the WLAN that you want to capture packets for3. You can also adjust the packet capture settings, such as the number of packets, duration, and maximum packet length3. Once you start the capture, you can download the PCAP file and open it in Wireshark for analysis3. Alternatively, you can use the Mist AI app to scan the QR code on the AP and start a wireless packet capture from your mobile device3.

According to the web search results, the statement that defines the total user minutes is the total number of minutes for which Mist has statistics for each client. Total user minutes is a metric that measures the amount of time that clients are connected to the wireless network and have data available for analysis1. Total user minutes is calculated by summing up the number of minutes that each client is associated to the network and has statistics collected by Mist1. Total user minutes can be used to evaluate the network performance, user experience, and service level expectations (SLEs) of the wireless network1.

The step that you would take to immediately find out the status of the Mist cloud is to visit https://status.mist.com. This is the official website that provides real-time information and updates on the availability and performance of the Mist cloud services, such as the Mist portal, the Mist API, the Mist AI engine, and the Mist regions. You can also subscribe to receive notifications via email, SMS, or webhook when there are any incidents or maintenance events affecting the Mist cloud.

the Persistently Failing Clients report can be found in Marvis Actions under the Other Actions section. This report shows clients that are continuously failing to connect due to a client specific issue2. You can also download the full list of your Persistently Failing clients in an organized .CSV file format1.

According to the official Mist documentation1, the organization level contains customer specific details such as name, password and session policies, certificate, and management tunnel. You can also create switch templates and port profiles at the organization level, which can be applied to all the devices in a given group. You can also configure the managed service provider setting at the organization level, if you want to bring independently created Mist organizations under MSP managed umbrella2.

According to the web search results, the Mist Location Engine is a service that provides location-based services (LBS) for wireless networks, such as indoor positioning, wayfinding, or asset tracking1. The Mist Location Engine uses a patented dynamic BLE array that consists of 16 directional antennas that transmit BLE signals in eight different directions2. The user device, such as a smartphone or a tablet, can receive these signals and send the signal information, such as the RSSI and the device sensor data, back to the Mist Location Engine via Wi-Fi or cellular2.

The Mist Location Engine then processes the signal information and uses machine learning and probability surfaces to determine the location of the user device2. The location is expressed as an x,y coordinate on a floor plan map that represents the highest probability of where the user device is located2. The Mist Location Engine can also provide other information, such as the location accuracy, the location history, and the location events of the user device2.

The area that you would use to obtain detailed information on a wireless client is the Insights area. The Insights area provides a comprehensive view of the wireless network performance and user experience, including the client dashboard, the live view, the service-level expectations (SLEs), and the Marvis virtual network assistant.

The client dashboard allows you to view and search for individual wireless clients and see their connection details, such as device type, MAC address, IP address, SSID, AP name, signal strength, throughput, data usage, location, and more. You can also perform actions on the clients, such as block, unblock, or capture packets.

The live view allows you to monitor the real-time status and activity of the wireless network and clients. You can see the number of connected clients, the traffic volume, the SLE scores, the top APs and SSIDs, and more. You can also filter and drill down into specific clients, APs, SSIDs, or sites.

The SLEs allow you to define and measure the quality of service and user experience for the wireless network. You can set thresholds and goals for key metrics, such as throughput, coverage, capacity, roaming, uptime, and WAN. You can also receive alerts and recommendations when the SLEs are violated.

The Marvis virtual network assistant allows you to interact with the wireless network using natural language commands. You can ask questions, troubleshoot issues, perform actions, and get insights from Marvis. For example, you can ask Marvis to show you the details of a wireless client or to explain why a client had a poor connection.

The correct answer is B. Bluetooth and BLE use the same radio channels. Bluetooth and BLE are both wireless technologies that operate in the 2.4 GHz ISM band1. They use the same 40 channels, each with a bandwidth of 1 MHz2. However, Bluetooth and BLE are not compatible, as they use different protocols and modulation schemes2. BLE is a newer technology than Bluetooth, as it was introduced in 2010 as part of the Bluetooth 4.0 specification3. BLE is designed to be more energy-efficient and suitable for low-power devices that transmit small amounts of data3.