Juniper Mist AI, Associate Exam JN0-251 JNCIA-MistAI Exam Practice Test

Answer : A, B

Mist Insights is a feature that provides detailed information about the network performance and user experience of your Mist-managed sites, access points (APs), and clients1.You can use Mist Insights to monitor, troubleshoot, and optimize your network by accessing various types of data and analytics collected by the Mist cloud1.

Mist Insights allows you to view insights for different contexts, such as the entire site, a specific AP, or a specific client2.You can select the context from the dropdown menu on the Insights dashboard in the Mist portal2.Depending on the context, you can see different sections of information and insights, such as site events, client events, AP events, applications, network servers, pre-connection and post-connection metrics, current site properties, current WLANs, access points, clients, and wired switches2.

Therefore, AP and client are two categories that Mist Insights will provide detailed information about. You can learn more about Mist Insights from theJuniper Networks documentationor theMist documentation.

Answer : A

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.

Answer : A, D

https://www.mist.com/documentation/administrator-roles/

The two roles that are available to the new user to administer specific sites in read-only mode areHelpdeskandObserver. These roles have read-only access to the allowed sites and can view the site-level features, such as monitor, clients, access points, location, analytics, and network. However, they cannot configure or modify any organization-level features or claim APs.

Answer : B

The correct statement about Mist SLEs is thata Mist SLE is comprised of multiple classifiers. A Mist SLE, or Service Level Expectation, is a metric that tracks the percentage of time that a specific network condition is met within a given time range. A Mist classifier is a sub-metric that identifies the root cause of the network condition or issue. For example, the Throughput SLE measures the percentage of time that the wireless clients have an estimated throughput above the threshold configured by the network administrator. The Throughput SLE has four classifiers: Coverage, Network Issues, Device Capacity, and Capacity.Each classifier indicates a possible reason for low throughput, such as poor signal strength, interference, device limitations, or high bandwidth utilization12.

Answer : C

A Mist Coverage SLE is based upon a summary of user minutes. A user minute is defined as one minute of active client connection to the wireless network. A Mist Coverage SLE tracks the number of user minutes that a client's received signal strength indicator (RSSI) as measured by the access point is below the threshold configured by the network administrator. The RSSI is a measure of how well a client can hear the access point's signal. A low RSSI indicates poor coverage and can result in low throughput, high latency, or dropped connections.

The Mist Coverage SLE allows the network administrator to monitor and troubleshoot the coverage issues on the wireless network. The Mist Coverage SLE also provides classifiers that identify the root causes of poor coverage, such as asymmetry, interference, or low transmit power. The network administrator can use the Mist portal, the Marvis virtual network assistant, or the Mist API to view and manage the Mist Coverage SLE.

Answer : A

The protocol that is used by Mist access points to discover third-party switches isLLDP. LLDP stands for Link Layer Discovery Protocol and is a vendor-neutral protocol that allows devices to advertise and discover information about their identity, capabilities, and neighbors on a local area network. LLDP operates on the data link layer (Layer 2) of the OSI model and uses multicast frames to exchange information.

Mist access points use LLDP to discover the switch name, model, firmware version, port number, VLAN ID, and PoE status of the connected third-party switches. This information is then sent to the Mist cloud, where it is processed and displayed in the Mist portal.You can view the switch details and topology in the Switches tab of the Mist portal1. You can also use the Marvis virtual network assistant to query the switch information using natural language commands.

Answer : A

The area that you would use to obtain detailed information on a wireless client is theInsightsarea. 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.