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JN0-253 Exam PDF [2026] Tests Free Updated Today with Correct 104 Questions
Juniper JN0-253 Exam Syllabus Topics:
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NEW QUESTION # 14
How often does Marvis Minis execute automatic validations?
- A. Every 30 minutes
- B. Every week
- C. Every day
- D. Every hour
Answer: D
Explanation:
Marvis Miniscontinuously validates the health of network services by performing synthetic tests at predefined intervals without requiring user intervention. These tests simulate real client interactions - such as authentication, DHCP, DNS, and application reachability - to detect network issues proactively.
According to theJuniper Mist Marvis Minis Technical Overview, the feature performs:
"Automated validations every hour to ensure wireless, wired, and WAN network services are operating as expected." Each validation cycle allows the Minis agent (running on Mist Access Points) to verify connectivity and performance parameters across key stages of the client experience. If any issues are detected, they are automatically surfaced in theMarvis Actions dashboardfor further analysis.
While administrators can trigger additional manual tests,automatic validations occur every hourby default across all enabled sites.
Therefore, the correct answer isB. Every hour.
References:- Juniper Mist Marvis Minis Operations and Validation Guide
NEW QUESTION # 15
According to Juniper Networks, what are two best practices for AP placement (excluding AP12) for optimal accuracy and stability of location-based services? (Choose two.)
- A. Enable a wireless mesh.
- B. Mount the AP above the ceiling, the LED orientation does not matter.
- C. Mount the AP on the ceiling with the LED facing the floor.
- D. Each AP should have an unobstructed fine of sight to at least two other APs.
Answer: C,D
Explanation:
Line of Sight: For optimal accuracy and stability of location-based services, each access point (AP) should have an unobstructed line of sight to at least two other APs. This ensures robust triangulation and accurate location tracking.
Ceiling Mounting: Mounting APs on the ceiling with the LED facing the floor is recommended.
This position provides the best coverage and performance for both Wi-Fi and BLE signals, essential for reliable location services.
NEW QUESTION # 16
When viewing the LATEST UPDATES on the Marvis Actions page, you see an action labeled AI VALIDATED.
What does this status mean?
- A. The issue was marked resolved by an administrator.
- B. The issue is resolved but was not manually marked resolved.
- C. The issue was identified and resolved entirely by Marvis.
- D. The issue is unresolved.
Answer: C
Explanation:
In theJuniper Mist Marvis Actions dashboard, issues and recommendations are displayed with status labels indicating their progress and resolution method. One of these statuses isAI VALIDATED, which signifies that the issue was automatically detected, diagnosed, and resolved byMarvis AIwithout requiring manual intervention.
According to theJuniper Mist Marvis Virtual Network Assistant Operations Guide:
"AI VALIDATED indicates that Marvis has confirmed and resolved a network issue autonomously using AI- driven automation and telemetry correlation." This means Marvis performed the full troubleshooting cycle-identifying the anomaly, validating its cause, and confirming resolution-based on continuous monitoring and real-time network analytics.
Other statuses include:
* UNRESOLVED:Issue is ongoing and needs attention.
* RESOLVED:Marked manually by an administrator after resolution.
* AI VALIDATED:Confirmed and closed automatically by Marvis AI.
Therefore, the correct answer isA. The issue was identified and resolved entirely by Marvis.
References:- Juniper Mist Marvis Virtual Network Assistant Operations Guide- Juniper Mist AI Actions and Insights Documentation- Juniper Mist Cloud Analytics and Troubleshooting Overview
NEW QUESTION # 17
Which statement about microservices is correct?
- A. Microservices are designed to be independent to ensure that if one process fails, the remaining processes will continue to operate.
- B. Microservices communicate with each other using Network Configuration Protocol (NETCONF).
- C. Microservices must share a common database to ensure data integrity.
- D. Microservices are developed as a complete application set, and updates require the modification of the entire application.
Answer: A
Explanation:
TheJuniper Mist Cloudarchitecture is built on amicroservices-based design, which enhances reliability, scalability, and operational efficiency. Each microservice performs a specific function-such as authentication, telemetry ingestion, analytics, or AI inference-independently of other components.
According to theJuniper Mist Cloud Architecture and Operations Guide:
"Mist Cloud leverages a microservices architecture where each service operates independently. This design ensures that a failure in one service does not impact the functionality or availability of others." This modular approach provides several key advantages:
* Fault isolation:One component can fail or restart without affecting the rest of the system.
* Independent scaling:Services can scale dynamically based on demand.
* Continuous updates:New features and patches can be deployed without downtime.
Options B, C, and D are incorrect because Mist microservices do not rely onNETCONFfor internal communication, arenot monolithic, and donot share a single common database-each maintains its own data model as required.
Therefore, the correct answer isA. Microservices are designed to be independent to ensure that if one process fails, the remaining processes will continue to operate.
References:- Juniper Mist Cloud Architecture and Operations Guide- Juniper Mist AI Platform and Microservices Overview- Juniper Mist Cloud Fundamentals Study Guide
NEW QUESTION # 18
You want to change the default language for your Juniper Mist portal.
What will accomplish this task?
- A. Input your primary language in the My Accounts page.
- B. Define your language using Organization templates.
- C. Select your ranked language choice from the Alerts page.
- D. Use the Change Language drop-down list of the Juniper Mist portal.
Answer: D
Explanation:
TheJuniper Mist Cloud portalprovides a user-friendly interface that supports multiple languages to enhance accessibility for global users. The language preference determines the display language for menus, dashboards, and configuration pages across the Mist UI.
According to theJuniper Mist Cloud Administration Guide, the portal's language can be modified as follows:
"Users can change the display language of the Mist portal using the Change Language drop-down list located in the upper-right corner of the interface." This option allows users to immediately switch the UI language without affecting other users in the organization or requiring administrative permissions. The change is applied per user profile and is stored for future sessions.
Other listed options are invalid:
* A:The Alerts page does not include language settings.
* B:The My Account page shows personal info but not display language options.
* C:Organization templates are unrelated to UI preferences.
Therefore, the correct answer isD. Use the Change Language drop-down list of the Juniper Mist portal.
References:- Juniper Mist Cloud Administration and User Interface Guide- Juniper Mist Cloud Portal User Preferences Documentation- Juniper Mist Cloud Fundamentals and Globalization Overview
NEW QUESTION # 19
You are asked to enable Mist management at an existing site with previously configured EX3400 brownfield switches, and to add a new greenfield switch.
Which statement is correct in this scenario?
- A. You can mix brownfield switches and greenfield switches as long as they are running a Mist- supported version of Junos.
- B. You cannot mix greenfield and brownfield switches at the same site.
- C. You can mix brownfield switches and greenfield switches at the same site, but only if they are running the same version of Junos.
- D. Brownfield switches can be adopted but not managed.
Answer: A
Explanation:
In the context of Mist management, "brownfield" switches refer to those that are already configured and deployed in a network, while "greenfield" switches are new and have no pre- existing configuration.
Mist supports the integration and management of both brownfield and greenfield switches within the same site. The crucial requirement is that all switches, regardless of their initial state, must be running a version of Junos that is supported by Mist. This compatibility ensures that Mist can apply policies, configurations, and monitoring uniformly across all devices, facilitating a seamless management experience.
NEW QUESTION # 20
Which two settings would you configure in a Mist radio frequency (RF) template? (Choose two.)
- A. band steering setting
- B. transmit power
- C. data rates
- D. channel width per Wi-Fi band
Answer: B,D
NEW QUESTION # 21
What are two requirements to use the Wired Visibility option of Juniper Mist Wireless Assurance?
(Choose two.)
- A. A Mist AP must be deployed in the network.
- B. A cloud-ready switch must be deployed in the network.
- C. The SNMP protocol must be configured on the switch.
- D. The LLDP protocol must be configured on the switch.
Answer: A,D
Explanation:
The Wired Visibility feature in Juniper Mist relies on Mist APs to gather insights about wired network devices. The APs act as sensors to collect data from connected switches and devices.
LLDP (Link Layer Discovery Protocol) is required for discovering neighboring devices, identifying switch port details, and enabling Wired Visibility to provide comprehensive insights.
NEW QUESTION # 22
Which Radio Resource Management (RRM) changes are only made once a day between 2:00 AM and 3:00 AM local time?
- A. channel and power settings across a site based on long-term statistics and baselines
- B. channel and power level changes triggered by SSID scheduling
- C. channel and power level changes triggered by DFS events
- D. RF template changes to channel width
Answer: A
Explanation:
Identify the Changes: Radio Resource Management (RRM) changes and their timings.
RRM Changes:
Channel and power settings based on long-term statistics.
RF template changes to channel width.
Changes triggered by SSID scheduling.
Changes triggered by DFS events.
Timing of Changes:
Long-term RRM changes to channel and power settings are typically scheduled once a day to avoid disrupting network performance.
NEW QUESTION # 23
Which two protocols does Marvis Minis automatically validate? (Choose two.)
- A. Dynamic Host Configuration Protocol (DHCP)
- B. Simple Network Management Protocol (SNMP)
- C. Network Time Protocol (NTP)
- D. Address Resolution Protocol (ARP)
Answer: A,D
Explanation:
Marvis Minisis a feature withinMarvis Virtual Network Assistant (VNA)that proactively tests and validates network performance by simulating user connections. Instead of waiting for user complaints, it performssynthetic client transactionsto confirm the functionality of critical network services.
According to theJuniper Mist Marvis Minis Technical OverviewandMarvis AI Operations Guide, Minis validates several network functions automatically, including:
* Dynamic Host Configuration Protocol (DHCP):Ensures clients can obtain IP addresses properly from DHCP servers, validating end-to-end DHCP exchange success and response time.
* Address Resolution Protocol (ARP):Verifies correct IP-to-MAC address resolution, confirming that clients can reach devices on the same subnet and that ARP tables are updated correctly.
Marvis Minis also performs checks onDNS resolution, authentication, and application reachability, but not on SNMP or NTP. Those protocols are used for management and time synchronization, not end-user connectivity validation.
Thus, the correct answers areB (DHCP)andD (ARP).
References:- Juniper Mist Marvis Minis Deployment and Operations Guide- Juniper Mist AI Assurance and Troubleshooting Documentation- Juniper Mist Cloud Synthetic Testing Overview
NEW QUESTION # 24
You want to troubleshoot a wireless client that is no longer connected to a Mist AP.
Which area within the Mist GUI would you use?
- A. Clients -> WiFi Clients
- B. Clients -> App Clients
- C. Organization -> Audit Logs
- D. Monitor -> Service Levels -> Insights
Answer: A
Explanation:
To troubleshoot a wireless client that is no longer connected to a Mist AP, you would navigate to the "Clients" section within the Mist GUI and select "WIFI Clients." This area provides detailed information about all wireless clients that have connected to the Mist APs, including their connection history, performance metrics, and any issues encountered. By examining the data available in the WIFI Clients section, network administrators can identify the root cause of connectivity problems and take appropriate actions to resolve them.
NEW QUESTION # 25
What are two ways that Juniper Mist Wireless Assurance enhances troubleshooting capabilities? (Choose two.)
- A. by using Predictive Analytics and Correlation Engine (PACE)
- B. by alerting administrators of subscription options through e-mail
- C. by monitoring congestion uplink as a percentage of gateway bandwidth
- D. by employing dynamic packet capture
Answer: A,D
Explanation:
Juniper Mist Wireless Assurance revolutionizes network troubleshooting by implementing Predictive Analytics and Correlation Engine (PACE) and dynamic packet capture. According to the official Mist documentation, PACE applies advanced data science and machine learning to analyze real network events and classify them for root-cause identification. The Mist PACE engine proactively identifies issues by correlating over 150 client and AP state changes, enabling the system to surface recommendations and automate root- cause resolution. This allows IT teams to move beyond reactive troubleshooting towards predictive and automated network operations, reducing time-to-resolution and minimizing user impact.
Additionally, dynamic packet capture significantly streamlines troubleshooting efforts. Mist Wireless Assurance automatically detects anomalies or failures in user and network behavior and instantly initiates a packet capture. These packet captures are contextually tagged to the affected event, stored in the cloud, and are readily accessible for analysis. This process eliminates the need for on-site technicians with sniffers, as now every major incident already has an associated packet capture, captured at the right moment. This capability greatly reduces troubleshooting time and ensures that issues can be reproduced and isolated accurately.
Reference:
Juniper Mist Wireless Assurance Configuration Guide-Root cause analysis and PACE Juniper Mist Documentation-Dynamic Packet Captures
NEW QUESTION # 26
Which two statements are correct about the switch configuration hierarchy in Juniper Mist? (Choose two.)
- A. The switch configuration cannot be managed at the organization level.
- B. The switch-specific configuration cannot override switch templates.
- C. The switch templates exist at the site level.
- D. The switch templates exist at the organization level.
Answer: C,D
Explanation:
TheJuniper Mist Wired Assuranceplatform uses ahierarchical configuration modelto manage switch settings efficiently across organizations and sites. This hierarchy provides flexibility by allowing administrators to applyglobal configurationsthrough templates at theorganization level, while also permitting site-specific customizations.
According to theJuniper Mist Wired Assurance Configuration and Template Management Guide, the configuration hierarchy functions as follows:
"Switch templates can be created at both the organization and site levels. Organization-level templates define global configurations, while site-level templates provide location-specific customization that overrides the organization-level settings where applicable." This structure enables consistent policy deployment while preserving site autonomy for unique configurations. For example, global VLAN or QoS configurations can be managed at the organization level, and local templates can adjust settings for switch ports or device groups at specific sites.
Switch-specific overrides are allowed within the hierarchy, ensuring flexibility in cases where unique port or feature configurations are required.
Therefore:
* Bis correct because switch templates exist at theorganization levelfor global use.
* Cis correct because switch templates also exist at thesite levelfor localized adjustments.
References:- Juniper Mist Wired Assurance Configuration and Template Management Guide- Juniper Mist Cloud Hierarchical Configuration Documentation- Juniper Mist Wired Assurance and EX/QFX Management Overview
NEW QUESTION # 27
You want to determine where you have coverage issues in your network using Marvis Actions.
Which Marvis Action category should you use in this situation?
- A. Clients
- B. AP
- C. Application
- D. Connectivity
Answer: B
NEW QUESTION # 28
Click the Exhibit button. The exhibit displays the connection flow for an API interaction sequence.
Which API type is displayed?
- A. Webhook
- B. RESTful
- C. SOAP
- D. WebSocket
Answer: A
Explanation:
The diagram displays the concept of a webhook interaction.
The client sends an initial request to the server (Step 1: Request/Response).
After that, the server asynchronously sends events or updates to the client (Steps 2 and 3: Event notifications), without requiring the client to poll for updates continuously.
This asynchronous "push" behavior is characteristic of webhooks, where the server pushes updates to the client.
NEW QUESTION # 29
What is the purpose of Audit Logs in Juniper Mist?
- A. to record administrative activities
- B. to record SLE violations
- C. to record security alerts
- D. to record key performance events
Answer: A
Explanation:
The purpose of Audit Logs in Juniper Mist is to record administrative activities within the Mist dashboard.
According to the official Juniper Mist documentation: "Audit Logs provide a detailed chronological record of each configuration change, administrative action, and user activity within the Mist Cloud portal. These logs include information such as the action performed (e.g., adding or removing sites, devices, or users), the timestamp, and the user who performed the action. Audit Logs are critical for accountability, compliance, and troubleshooting, enabling administrators to trace changes and ensure that only authorized users are making modifications to their network settings. Mist stores audit log records securely and makes them accessible for review by organization administrators from the dashboard's Organization > Audit Logs section." This directly aligns with option C, as the logs primarily track configuration changes and administrative actions-not performance events, security alerts, or SLE violations. Such activities include site creation, modification, device assignment, role changes, and other user or configuration updates.
Reference: Juniper Mist Documentation - Audit Logs and Organization Management, Mist AI Study Guide.
NEW QUESTION # 30
Which language is used to execute Marvis queries in the Mist UI?
- A. Natural Language
- B. Python
- C. Structured Query Language (SQL)
- D. C++
Answer: A
Explanation:
Understanding Marvis Queries:
Marvis is the AI-driven virtual network assistant in Mist that helps with queries and troubleshooting.
Language Used for Queries:
Natural Language: Marvis is designed to understand and respond to natural language queries, making it user-friendly.
Python, C++, SQL: These are programming and query languages not used directly for Marvis queries.
NEW QUESTION # 31
How are Mist Alerts sent?
- A. using a text message
- B. using e-mail
- C. using Slack
- D. using Skype
Answer: B
NEW QUESTION # 32
Which users have rights to invite new administrators to a Mist organization?
- A. any user with an organization account
- B. users with the "Invite Admin" permission
- C. network admin user only
- D. super user only
Answer: D
NEW QUESTION # 33
Where does Mist use AI reinforcement learning?
- A. Mist uses reinforcement learning in its Radio Resource Management (RRM) service.
- B. Mist uses reinforcement learning to troubleshoot video call connection issue.
- C. Mist uses reinforcement learning in its dynamic packet capture service.
- D. Mist uses reinforcement learning to troubleshoot voice call quality issues.
Answer: A
Explanation:
Mist AI uses reinforcement learning in its Radio Resource Management (RRM) service. This approach allows the system to dynamically optimize the performance of the wireless network by adjusting various radio parameters. The RRM service continuously learns and adapts based on network conditions, user behavior, and environmental factors to ensure optimal performance and reliability.
NEW QUESTION # 34
Which machine learning method uses unlabeled data sets?
- A. Unsupervised learning
- B. Supervised learning
- C. Cognitive learning
- D. Reinforcement learning
Answer: A
Explanation:
InJuniper Mist AI, variousmachine learning (ML)techniques are applied across the platform to analyze network telemetry and improve performance insights. Among these,unsupervised learningplays a critical role in identifying patterns, trends, and anomalies in unlabeled datasets-data that has not been pre-classified or annotated.
According to theJuniper Mist AI and Machine Learning Overview:
"Unsupervised learning enables Mist AI to automatically detect abnormal patterns or clusters in large volumes of unlabeled network data, allowing the system to identify anomalies and optimize network behavior without human labeling." This method allows Mist AI to autonomously recognize deviations in user experience, traffic behavior, or radio performance without prior definitions, helping to enhance predictive analytics and anomaly detection.
By contrast:
* Supervised learningrequires labeled training data.
* Reinforcement learninglearns through trial-and-error feedback loops.
* Cognitive learningis not a formal ML category-it refers to human-inspired reasoning.
Therefore, the correct answer isD. Unsupervised learning.
References:- Juniper Mist AI and Machine Learning Overview- Juniper Mist Cloud Architecture and AI Engine Guide- Juniper Mist Predictive Analytics and Correlation Engine (PACE) Documentation
NEW QUESTION # 35
In Juniper Mist, which three devices send data to the Juniper Mist Cloud? (Choose three.)
- A. Juniper Mist Edge
- B. Access Point
- C. RADIUS Server
- D. Session Smart Router
- E. Syslog Server
Answer: A,B,D
Explanation:
In theJuniper Mist Cloud architecture, data is collected and streamed from variousedge devicesto the Mist Cloud platform, whereAI-driven analytics,automation, andtelemetry correlationoccur. OnlyMist- managed devicesthat are cloud-connected contribute operational telemetry data to Mist AI for analysis.
According to theJuniper Mist Cloud Architecture and Operations Guide:
"Access Points, Juniper Mist Edge devices, and Session Smart Routers (SSR) communicate directly with the Mist Cloud, sending telemetry, configuration, and analytics data in real time."
* Access Points (B):Provide wireless client telemetry, RF statistics, and user SLE (Service Level Expectation) data.
* Session Smart Routers (C):Supply WAN Assurance and routing analytics, including path and session health data.
* Juniper Mist Edge (D):Acts as an on-premises gateway that forwards data and enables local breakout for Mist Cloud services.
Syslog ServersandRADIUS Serversare external systems and do not send native telemetry to the Mist Cloud-they only interact through authentication or logging integrations.
References:- Juniper Mist Cloud Architecture and Operations Guide- Juniper Mist WAN and Wired Assurance Documentation- Juniper Mist Edge and Session Smart Router Integration Guide
NEW QUESTION # 36
Which location-based service does User Engagement provide?
- A. Wi-Fi presence analytics
- B. asset tracking
- C. wayfinding
- D. ultra wide band location
Answer: A
NEW QUESTION # 37
Exhibit:
Referring to the exhibit, which classifier was the largest contributor to 17% of the capacity issues?
- A. Wi-Fi Interference
- B. Ethernet
- C. Authorization
- D. Network Issues
Answer: A
Explanation:
Within theJuniper Mist Wireless Assurance dashboard, theCapacity SLE (Service Level Expectation) provides visibility into how well the network can handle concurrent users and traffic loads. It identifies the contributing factors, orclassifiers, responsible for degraded capacity performance such asWi-Fi interference, network issues, Ethernet problems, or authorization delays.
According to theJuniper Mist AI Operations and SLE Analytics Guide, the platform:
"Uses classifiers to break down SLE metrics and identify which network factors most heavily contribute to sub-threshold performance." In the exhibit, theWi-Fi interferenceclassifier has the longest bar reaching the full17%, clearly showing it as the largest contributor to capacity degradation. Wi-Fi interference occurs when multiple APs or nearby wireless networks overlap on the same channel, resulting in increased contention, collisions, and reduced airtime availability - all of which impact overall capacity.
Therefore, the correct answer isD. Wi-Fi Interference.
References:- Juniper Mist Wireless Assurance SLE and Classifier Documentation- Juniper Mist AI Operations and Analytics Guide- Juniper Mist Dashboard and Troubleshooting Insights Overview
NEW QUESTION # 38
Which two statements correctly describe the encryption of traffic using Mist? (Choose two.)
- A. By default, the communication between an AP and a RADIUS server is encrypted.
- B. By default, the communication between a Wi-Fi client and an AP is encrypted.
- C. By default, the communication between a Wi-Fi client and an AP is not encrypted.
- D. By default, the communication between an AP and a RADIUS server is not encrypted.
Answer: B,D
Explanation:
AP and RADIUS Server Communication: By default, the communication between an Access Point (AP) and a RADIUS server is not encrypted. This can be configured to be encrypted, but it is not the default setting.
Wi-Fi Client and AP Communication: By default, the communication between a Wi-Fi client and an AP is encrypted, typically using WPA2 or WPA3, which ensures the data exchanged over the wireless network is secure.
NEW QUESTION # 39
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