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

Answer : A

The status of user authentication will affect the pair of SLEs:Successful ConnectsandTime to Connect. These are two of the eight SLEs that Mist provides to measure the wireless network performance and user experience. SLE stands for Service Level Expectation and is a metric that tracks the percentage of time that a specific network condition is met within a given time range.

The Successful Connects SLE measures the percentage of time that the wireless clients can successfully authenticate and associate to the network. The Time to Connect SLE measures the average time that it takes for the wireless clients to complete the authentication and association process. Both of these SLEs depend on the status of user authentication, which is the process of verifying the identity and credentials of the wireless clients.

If the user authentication fails or takes too long, it will negatively affect the Successful Connects and Time to Connect SLEs. The user authentication can fail or take too long due to various reasons, such as incorrect credentials, unsupported encryption type, misconfigured RADIUS server, network congestion, etc. Mist can detect and classify these issues and provide alerts and recommendations to resolve them.

Answer : C

According to theMist Access Pointspage, the BT11 is a dedicated device for location-based services (LBS) in the Mist Access Point portfolio1.The BT11 is a battery-powered Bluetooth Low Energy (BLE) beacon that can be used to enhance the accuracy and reliability of indoor location services1.The BT11 can be placed in areas where Mist APs are not available or where additional BLE coverage is needed1.The BT11 can be managed by the Mist cloud and integrated with the Mist AI platform for analytics and automation1.

Answer : A, D

Answer : C

According to the Cisco Content Hub1, Wi-Fi is half duplex, meaning we can either transmit (Tx) or receive (Rx) on the medium, the clients and the network take turns accessing the medium. Wi-Fi is contention based, meaning there are rules for stations trying to access the medium and collisions (due to two or more stations simultaneously accessing the medium) are worked out fairly so everyone gets a chance.

Answer : A, B

These are two categories that are included in the Connectivity Marvis Action. The Connectivity Marvis Action lists the network issues that affect the connectivity of devices, users, or applications in the Juniper Mist cloud. The Offline AP category shows the APs that are offline or unreachable by the Juniper Mist cloud.The Bad Cable category shows the switches or APs that have bad cables or ports1. The other two categories, C. ARP Failure and D. DNS Failure, are not part of the Connectivity Marvis Action, but they are part of the Network Services Marvis Action.The Network Services Marvis Action lists the network issues that affect the network services such as DHCP, DNS, ARP, and NTP1.

Answer : B

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.

Answer : A, B

According to the official Mist documentation1, wireless packet captures are helpful when trying to dissect and dig down into the root cause of any wireless issue between a client and AP. You can determine if packets being sent are actually reaching their destination as well as identify if packets are corrupted. With the enhanced packet capture flow, Mist also introduced the ability to capture packets on the wired side of your network as well. This data is captured from the Eth0 port of your AP, and will examine the packets between the AP and the rest of your wired network. This includes any RADIUS, DHCP, or DNS servers you have set up.

The Mist UI does not support BLE packet capture or packet capture on cloud uplink.