May-2024 JN0-251 Study Material, Preparation Guide and PDF Download
Free JN0-251 Certification Sample Questions with Online Practice Test
Juniper JN0-251 (Mist AI, Associate (JNCIA-MistAI)) exam is an essential certification for individuals seeking to become proficient in the field of AI-driven wireless networking. JN0-251 exam is designed to test the candidate's understanding of the core concepts of AI-driven wireless networking, including the configuration, troubleshooting, and maintenance of network infrastructure that utilizes AI and machine learning technologies. Mist AI, Associate (JNCIA-MistAI) certification is an excellent way to demonstrate your skills and knowledge to potential employers and clients, and it can help you to advance your career in the field of AI-driven wireless networking.
Juniper Networks is a leading provider of networking solutions and infrastructure for businesses of all sizes. Their products and services help organizations to build secure and reliable networks that can handle the demands of modern workloads. With the rise of artificial intelligence and machine learning technologies, Juniper has been at the forefront of developing solutions that leverage these capabilities to enhance network performance and security. One of their latest offerings is the Juniper JN0-251 certification exam.
NEW QUESTION # 43
Click the Exhibit button.
You notice a green LED emitted from your AP43.
Referring to the exhibit, what does this signal indicate?
- A. The AP is configured correctly with no users connected to it.
- B. The AP is configured correctly and at least one user is connected to it.
- C. The AP is not configured correctly but one user is connected to it.
- D. The AP is not configured correctly with no users connected to it.
Answer: B
NEW QUESTION # 44
Mist has detected a bad cable.
What are two ways that Marvis determined this result? (Choose two.)
- A. It identified a missing VLAN.
- B. It identified interface errors.
- C. It identified network loops.
- D. It identified port flapping.
Answer: C,D
NEW QUESTION # 45
You want to obtain detailed information on a wireless client.
In this scenario, which area would you use to accomplish this task?
- A. Templates
- B. Insights
- C. SLEs
- D. Security
Answer: B
NEW QUESTION # 46
Which protocol does the REST API use?
- A. HTTP
- B. SSL
- C. SNMP
- D. syslog
Answer: A
NEW QUESTION # 47
Which protocol is used by Mist access points to discover third-party switches?
- A. LLDP
- B. ICMP
- C. CDP
- D. SNMP
Answer: A
NEW QUESTION # 48
Which statement is correct about Mist SLEs?
- A. A Mist SLE is comprised of a single classifier.
- B. A Mist SLE is comprised of multiple classifiers.
- C. A Mist classifier is comprised of a single SLE.
- D. A Mist classifier is comprised of multiple SLEs.
Answer: B
NEW QUESTION # 49
You are inviting a new administrator into a Mist organization.
In this scenario, which two roles are valid? (Choose two.)
- A. Custom
- B. Observer
- C. Installer
- D. Advanced
Answer: B,C
NEW QUESTION # 50
Which administrator role must you have to view audit logs?
- A. Super User
- B. Observer
- C. Network Admin
- D. Installer
Answer: A
NEW QUESTION # 51
Which Marvis Action category will detect a bad cable based on information and behavior of a single AP?
- A. AP
- B. Switch
- C. Layer 1
- D. Connectivity
Answer: B
Explanation:
Reference:
According to the web search results, the Marvis Action category that will detect a bad cable based on information and behavior of a single AP is Switch1. The Switch category lists the issues related to the switches that are connected to the Mist APs, such as missing VLANs, L2 loops, or bad cables1. The bad cable action detects if an AP is connected to a switch port that has a faulty cable, which can cause packet loss, CRC errors, or link flaps1. The bad cable action is based on the information and behavior of a single AP, such as the AP's MAC address, IP address, switch port, and link status1. The bad cable action also provides a recommended solution, which is to replace the cable or use another switch port1.
NEW QUESTION # 52
How does Mist detect rogue APs?
- A. by using the AP's 5 GHz radio band
- B. by using the AP's third dedicated radio
- C. by using the AP's 2.4 GHz radio band
- D. by using Radio Resource Management (RRM)
Answer: B
NEW QUESTION # 53
How should APs be deployed for location-based services (LBS)?
- A. with the AP mounted on a wall
- B. with the LED facing the ceiling
- C. with the LED facing the floor
- D. with the LED facing a wall
Answer: C
NEW QUESTION # 54
Mist cloud supports single sign-on in which two scenarios? (Choose two.)
- A. Wi-Fi guest login access
- B. account login used for the RESTful API
- C. admin login to the Mist portal
- D. account login used for NETCONF
Answer: A,B
NEW QUESTION # 55
Referring to the exhibit, what do you determine about the site's Time to Connect SLE metric?
- A. Eighty percent of the Time to Connect failures are related to DHCP failures
- B. Time to Connect Association DHCP failures impacted 80% of users.
- C. All clients cannot connect to the Internet.
- D. Successful connect averaged 1.6 seconds.
Answer: D
NEW QUESTION # 56
Which two categories are included in the Connectivity Marvis Action? (Choose two.)
- A. Bad Cable
- B. DNS Failure
- C. Offline AP
- D. ARP Failure
Answer: A,C
Explanation:
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.
NEW QUESTION # 57
How does Mist detect rogue APs?
- A. by using the AP's 5 GHz radio band
- B. by using the AP's third dedicated radio
- C. by using the AP's 2.4 GHz radio band
- D. by using Radio Resource Management (RRM)
Answer: B
Explanation:
Reference:
According to the web search results, Mist detects rogue APs by using the AP's third dedicated radio, which is used for scanning the wireless spectrum and detecting unauthorized APs on both 2.4 GHz and 5 GHz radio bands1. A rogue AP is an unauthorized access point that is installed on a network without the knowledge or consent of the network administrator1. A rogue AP can pose a serious security threat to a network, as it can allow attackers to bypass the network's security policies and gain access to sensitive data or launch other attacks1. A rogue AP can also interfere with the performance of the legitimate APs and cause network congestion or degradation1.
Mist APs have three radios: one for 2.4 GHz, one for 5 GHz, and one for scanning1. The scanning radio is used for detecting rogue, neighbor, and honeypot APs on both 2.4 GHz and 5 GHz radio bands1. This means that regardless of which radios you have enabled on your AP (2.4 GHz or 5 GHz), it will still be able to detect unauthorized APs at any frequency using the scanning radio1. The scanning radio can also provide other benefits, such as monitoring the network performance, optimizing the channel selection, and enhancing the location services1.
Therefore, based on the web search results, Mist detects rogue APs by using the AP's third dedicated radio, which is used for scanning the wireless spectrum and detecting unauthorized APs on both 2.4 GHz and 5 GHz radio bands.
NEW QUESTION # 58
Which statement defines the total user minutes?
- A. The total number of minutes for which Mist has statistics for each client.
- B. The average number of minutes that all clients have been associated to the network.
- C. The total amount of device uptime over the last seven days.
- D. The total number of minutes between a client's last association and disassociation.
Answer: A
Explanation:
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.
NEW QUESTION # 59
Mist Insights will provide detailed information about which two categories? (Choose two.)
- A. AP
- B. Organization
- C. Templates
- D. Client
Answer: B,C
NEW QUESTION # 60
The Mist help menu provides direct access to which two features? (Choose two.)
- A. feature updates
- B. hardware updates
- C. company updates
- D. firmware updates
Answer: A,D
NEW QUESTION # 61
You are asked to bring Mist APs online for your organization.
In this situation, which port must be allowed on your company's firewall for AP access to the Mist cloud?
- A. UDP/22
- B. TCP/80
- C. TCP/443
- D. UDP/1812
Answer: C
Explanation:
Reference:
According to the web search results, TCP/443 is the port that must be allowed on your company's firewall for AP access to the Mist cloud. TCP/443 is the port that is used for HTTPS, which is a secure version of HTTP that encrypts the data sent between the client and the server1. Mist APs use HTTPS to communicate with the Mist cloud and receive their configuration, firmware, and policies2. TCP/443 is also the port that is used for ep-terminator, which is a service that provides encrypted tunneling between Mist APs and the Mist cloud3. Therefore, TCP/443 is the port that must be allowed on your company's firewall for AP access to the Mist cloud.
NEW QUESTION # 62
What are two valid Mist subscription status states in the Mist GUI? (Choose two.)
- A. Perpetual
- B. Expired
- C. Staged
- D. Exceeded
Answer: A,B
NEW QUESTION # 63
Which administrator role is based on a timed grace period for Mist site and AP configuration access?
- A. Helpdesk
- B. Observer
- C. Network Admin
- D. Installer
Answer: D
Explanation:
Reference:
According to the Administrator Roles page, the Installer role is based on a timed grace period for Mist site and AP configuration access1. The Installer role has minimum access to the organization and can do the initial installation tasks such as claim AP to Org, assign AP to site, or place on map, etc1. However, the Installer role cannot unclaim or remove the AP from the Org1. The site and AP access for the Installer role is based on a timed grace period after the last modified time, which is by default 7 days1. This means that the Installer role can only access the site and AP for 7 days after the last configuration change1. The Installer role uses the API and Mist AI App, and has no access to the native Admin UI1.
NEW QUESTION # 64
In which two Mist configuration levels would you create labels? (Choose two.)
- A. location
- B. switch
- C. organization
- D. site
Answer: C,D
Explanation:
Reference:
Labels are a way of grouping devices, users, or applications in the Juniper Mist cloud. Labels can be created at the site level or the organization level1. Labels can be used to apply policies, templates, or service-level expectations (SLEs) to the devices, users, or applications that match the label criteria1. Labels can also be used to filter data in the Juniper Mist dashboard or reports1.
NEW QUESTION # 65
Which characteristic describes Mist's cloud software architecture?
- A. shard based
- B. controller based
- C. microservices based
- D. monolithic code
Answer: C
Explanation:
Reference:
The correct answer is A. microservices based. This is the characteristic that describes Mist's cloud software architecture. Mist's cloud software architecture is based on microservices, which are small, independent, and loosely coupled software components that communicate with each other through APIs1. Microservices allow for faster development, deployment, scaling, and maintenance of cloud applications, as well as improved reliability, performance, and security1. Mist's cloud software architecture leverages microservices to provide AI-driven network management and operations, as well as innovative features such as vBLE engagement, Marvis Virtual Network Assistant, and Wi-Fi Assurance2.
NEW QUESTION # 66
Which statement is correct about Mist SLEs?
- A. A Mist classifier is comprised of a single SLE.
- B. A Mist SLE is comprised of a single classifier.
- C. A Mist SLE is comprised of multiple classifiers.
- D. A Mist classifier is comprised of multiple SLEs.
Answer: A
NEW QUESTION # 67
Mist has detected a bad cable.
What are two ways that Marvis determined this result? (Choose two.)
- A. It identified network loops.
- B. It identified a missing VLAN.
- C. It identified port flapping.
- D. It identified interface errors.
Answer: C,D
Explanation:
Mist has detected a bad cable by using two methods: port flapping and interface errors. These methods are based on the data collected by the Mist access points, switches, and WAN edge devices from the cable statistics, link statistics, link errors, and traffic patterns.
Port flapping is a condition where a port on a switch or a device repeatedly goes up and down, causing network instability and packet loss. Port flapping can be caused by a bad cable that has physical damage, loose connection, or interference. Mist can detect port flapping by monitoring the link status and the number of link state changes on the port.
Interface errors are errors that occur on the interface level of a switch or a device, such as input errors, output errors, frame errors, CRC errors, MTU errors, etc. Interface errors can indicate a bad cable that has poor quality, mismatched speed or duplex settings, or incorrect wiring. Mist can detect interface errors by monitoring the error counters and the error rates on the interface.
NEW QUESTION # 68
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To pass the Juniper JN0-251 exam, candidates are required to have a solid understanding of wireless networking concepts and technologies, as well as hands-on experience with Juniper Mist AI wireless networks. Candidates are also expected to have a good understanding of network security concepts and technologies, as well as network automation and analytics. JN0-251 exam consists of 65 multiple-choice questions and has a duration of 90 minutes.
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