Current JN0-253 Exam Dumps [2026] Complete Juniper Exam Smoothly
JN0-253 Premium PDF & Test Engine Files with 104 Questions & Answers
Juniper JN0-253 Exam Syllabus Topics:
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NEW QUESTION # 28
Which unit of measurement is used for capacity, coverage, and throughput SLEs?
- A. percentage of user minutes
- B. signal strength in dBm
- C. throughput in Mbps
- D. percentage of channel utilization
Answer: C
Explanation:
For capacity, coverage, and throughput Service Level Expectations (SLEs) in Mist AI, throughput is measured in Mbps. This unit measures the rate at which data is successfully delivered over the wireless network, providing a clear indication of network performance and user experience. Mist AI tracks these metrics to ensure the network meets the required performance standards.
NEW QUESTION # 29
Which statement about microservices is correct?
- A. Microservices are developed as a suite of applications and rely on developers to deliver updates to the entire suite at once.
- B. Microservices must share a common database to ensure data integrity.
- C. Microservices are designed to be dependent on each other to ensure that if one process fails, the remaining processes will not continue to operate.
- D. Microservices communicate with each other using APIs.
Answer: D
Explanation:
TheJuniper Mist Cloud platformis built on amicroservices-based architecture, where individual software components perform specific functions and communicate using well-definedApplication Programming Interfaces (APIs).
According to theJuniper Mist Cloud Architecture and Operations Guide:
"Microservices communicate through secure APIs, allowing independent services to interact seamlessly while maintaining modularity and isolation." This architectural design provides major operational benefits, including:
* Independent scalability- each service can scale based on workload demand.
* Fault isolation- failures in one service do not affect others.
* Continuous deployment- updates can be made to one service without impacting the rest of the platform.
Incorrect options:
* B:Juniper Mist microservices are independently updated, not deployed as one suite.
* C:They are independent, not dependent on one another.
* D:Each microservice maintains its own data model; they do not rely on a single shared database.
Thus, the correct answer isA. Microservices communicate with each other using APIs.
References:- Juniper Mist Cloud Architecture and Operations Guide- Juniper Mist Cloud Fundamentals Study Guide- Juniper Mist AI and Microservices Overview
NEW QUESTION # 30
Which two statements are correct about Juniper Mist Wired Assurance ZTP? (Choose two.)
- A. All legacy Juniper switch models are supported.
- B. The technician must have console access to the switch during the initial setup.
- C. The switch must be running a supported Junos version for Juniper Mist Wired Assurance.
- D. The cloud-ready Juniper switch must either boot from the factory-default state or you can issue the request system zeroize Junos command to reset the configuration.
Answer: C,D
Explanation:
Supported Junos Version: For Juniper Mist Wired Assurance to function correctly, the switch must be running a supported Junos version. This ensures compatibility with Mist's cloud management and AI capabilities.
Factory-Default State or Zeroize Command: The switch must boot from a factory-default state, or you can use the request system zeroize command to reset its configuration. This is essential for seamless onboarding and auto-provisioning.
NEW QUESTION # 31
Which statement is correct about the SLE dashboard?
- A. Both SLEs and classifiers are displayed as a percentage of success.
- B. SLEs are displayed as a percentage of success and classifiers are displayed as a percentage of failure.
- C. Both SLEs and classifiers are displayed as a percentage of failure.
- D. SLEs are displayed as a percentage of failure and classifiers are displayed as a percentage of success.
Answer: B
Explanation:
In the SLE dashboard, Service Level Expectations (SLEs) are shown as a percentage of success to highlight how well the network is performing. On the other hand, classifiers are displayed as a percentage of failure to indicate areas where issues are occurring and need attention. This approach helps provide a clear understanding of both overall performance and problem areas.
NEW QUESTION # 32
Which statement is true about unsupervised AI learning?
- A. A human must label the dataset before the AI can be trained on it.
- B. It is used to analyze and classify unlabeled datasets.
- C. A human labels the dataset after the AI trains on it.
- D. It is used to analyze and classify labeled datasets.
Answer: B
NEW QUESTION # 33
Which two statements are true about packet captures on an AP? (Choose two.)
- A. The involved APs remain in service.
- B. Wireless and wired packets can be captured.
- C. The involved APs are taken out of service.
- D. Only wireless packets can be captured.
Answer: A,B
Explanation:
Mist APs have the capability to capture both wireless and wired packets. This feature allows for comprehensive network troubleshooting by providing visibility into both types of traffic. When performing packet captures on Mist APs, the APs remain in service. This means they continue to operate and serve clients while the capture is ongoing, ensuring minimal disruption to network operations.
This functionality is critical for maintaining network availability and performance while conducting detailed packet analysis.
NEW QUESTION # 34
Which data format is used for exchanging data with the Juniper Mist REST API?
- A. JSON
- B. XML
- C. YAML
- D. protocol buffers
Answer: A
Explanation:
The Juniper Mist REST API uses the JSON (JavaScript Object Notation) format for data exchange. The official Juniper Mist REST API overview states: "Juniper Mist uses REST APIs, which use HTTP methods (GET, POST, PUT, and DELETE) to transfer data in JavaScript Object Notation (JSON) format." All interactions with the API involve sending request payloads in JSON, and receiving responses encoded in JSON as well. Juniper Mist's automation and integration guides reinforce that the content type for API communications is always "application/json". Sample requests provided in the documentation, such as creation or feedback from POST, PUT, and GET methods, are displayed in JSON structure.
Unlike other formats such as YAML, XML, or protocol buffers, JSON is universally supported and highly favored for RESTful APIs because it is lightweight, human readable, and easily parsed by web and programming frameworks. This ensures consistency and compatibility across diverse integrations and automation workflows using the Mist platform.
Reference:Juniper Mist RESTful API Overview, Mist API Introduction, Mist Automation Guide
NEW QUESTION # 35
You have five clients on the network and 20 minutes of statistics for each client.
In this scenario, how many user minutes does this equal?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
Explanation:
Identify the Scenario: Five clients on the network and 20 minutes of statistics for each client.
Calculation:
User Minutes = 100.
Conclusion:
The total user minutes in this scenario is 100.
NEW QUESTION # 36
How does Mist determine the location of clients in an indoor setting?
- A. triangulation
- B. trilateration
- C. GPS
- D. probability surface
Answer: D
Explanation:
Mist builds location from "Probability Surfaces" not triangulation. The more directional RSSI beam information your client hears, the more data for the location engine to work with creating the probability surfaces, which provides the best possible location accuracy with sub second latency.
NEW QUESTION # 37
What are two ways that Juniper Mist Access Assurance enforces network access control? (Choose two.)
- A. It assigns specific roles to users.
- B. It monitors network traffic.
- C. It groups users into network segments.
- D. It creates a VPN using an IPsec tunnel.
Answer: A,C
Explanation:
Juniper MistAccess Assuranceis a cloud-based network access control service that provides secure wired and wireless access through identity- and policy-based mechanisms. According to the official Juniper Mist AI documentation, Access Assurance usesuser and device identityto determine network access privileges dynamically.
The service enforces access policies primarily in two ways:
* Assigning Specific Roles to Users:Access Assurance dynamically assigns roles to users and devices after successful authentication. These roles are used to apply specific network policies and permissions, defining what level of access or network resources a user or device is allowed. Roles can be leveraged in wireless SSID configurations or switch access policies to ensure consistent enforcement across the infrastructure.
* Grouping Users into Network Segments:Access Assurance also allows grouping of users and devices intonetwork segmentsusing VLANs or Group-Based Policy (GBP) technology. This segmentation isolates users or devices into logical groups, ensuring security and optimized traffic handling. Policies are then applied to these groups to control communication between segments, thereby maintaining a zero-trust framework.
Options A and B are incorrect because Access Assurance does not establish VPN tunnels or passively monitor traffic as its primary method of access control. It relies instead onidentity-based role assignment and segmentationto enforce network security.
References:- Juniper Mist Access Assurance Data Sheet- Juniper Mist Access Assurance Getting Started Guide- Juniper Mist AI Cloud Documentation
NEW QUESTION # 38
Which Juniper Mist product enables the onboard Bluetooth Low Energy (BLE) antenna array for listen-only mode?
- A. Wi-Fi Management and Assurance
- B. vBLE Engagement
- C. Access Assurance
- D. Asset Visibility
Answer: D
Explanation:
InJuniper Mist's Location-Based Services, theAsset Visibilityservice utilizes the built-inBluetooth Low Energy (BLE)antenna array within Mist Access Points to track BLE tags and devices inlisten-only mode.
This allows the APs to receive BLE signals emitted by assets and compute their real-time location usingangle- of-arrival (AoA)andRSSI-based triangulation.
According to theJuniper Mist Asset Visibility and Location Services Guide:
"When operating in Asset Visibility mode, the vBLE antenna array in Mist Access Points functions in listen- only mode, collecting BLE chirps from asset tags and relaying this data to the Mist Cloud for location determination." This configuration differs fromvBLE Engagement, where APs transmit BLE beacons to interact with mobile apps. InAsset Visibility, the BLE array passively listens to track tagged assets (e.g., equipment, IoT devices) across a defined floor map.
Therefore, the correct answer isD. Asset Visibility.
References:- Juniper Mist Asset Visibility and Location-Based Services Configuration Guide- Juniper Mist vBLE Architecture Overview- Juniper Mist Cloud Location Services Documentation
NEW QUESTION # 39
What is required for Marvis Minis to operate?
- A. Minimum AP firmware
- B. WAN Assurance subscription
- C. Premium Analytics subscription
- D. WLAN template
Answer: A
Explanation:
Marvis Minisis an advanced feature within the Juniper Mist AI ecosystem designed to performautonomous, synthetic network testing. It uses Mist Access Points (APs) to simulate client behavior-such as association, authentication, DHCP, DNS, and application reachability-to proactively detect service issuesbefore real users are affected.
According to theJuniper Mist Marvis Minis Deployment GuideandMarvis AI documentation, the key requirement for enabling Marvis Minis is that all participating access points must be running aminimum supported firmware versionthat includes the Minis agent functionality.
The documentation specifies:
"Marvis Minis requires APs running the minimum firmware version that supports synthetic testing. APs on earlier versions will not be capable of running Minis tests or reporting results to the Mist Cloud." Additional subscriptions such asWAN Assurance,Premium Analytics, orWLAN templatesare not prerequisites for operation. WhileMarvis licensingmust be active, the feature itself relies primarily on compatible firmware within the Mist-managed APs.
Therefore, the correct answer isC. Minimum AP firmware- ensuring the APs are on a supported firmware release is essential for Marvis Minis functionality.
References:- Juniper Mist Marvis Minis Deployment and Configuration Guide- Juniper Mist AI Operations and Troubleshooting Documentation- Juniper Mist Wireless Assurance and Firmware Management Guide
NEW QUESTION # 40
You scheduled downtime to push the latest firmware to all the APs you deployed at the site. You verified that all of the APs are working fine. When you go back to work, you notice no complaints from the users. When you check the AP page, you notice that several APs have not rolled out with the latest firmware.
In this scenario, how does Marvis categorize this issue in the Marvis Action dashboard?
- A. The non-compliant Marvis Action is displayed.
- B. The high CPU Marvis Action is displayed.
- C. The missing VLAN Marvis Action is displayed.
- D. The port flap Marvis Action is displayed.
Answer: A
Explanation:
When several APs fail to update to the latest firmware during a scheduled downtime, Marvis categorizes this issue as a "non-compliant" action.
This categorization indicates that some APs are not adhering to the intended firmware version policy, which could potentially affect network performance or security. The non-compliant Marvis Action provides administrators with the necessary information to identify and rectify the issue, ensuring all APs are updated as required.
NEW QUESTION # 41
Which Juniper Mist feature provides application forwarding path details?
- A. Forwarding Insights
- B. Router Insights
- C. WAN Edge Insights
- D. Platform Insights
Answer: A
Explanation:
In theJuniper Mist WAN AssuranceandSD-WANframework,Forwarding Insightsis the feature responsible for providingapplication forwarding path visibility. It delivers detailed analytics on how application traffic is being routed across the WAN, enabling network administrators to understand and optimize application performance across multiple WAN links or paths.
According to theJuniper Mist WAN Assurance and Insights Documentation,Forwarding Insights:
"Provides visibility into the application forwarding path by showing which WAN link or tunnel is used for a specific flow, including health metrics such as latency, loss, and jitter." It integrates withMarvisand theAI-driven WAN Assurance engineto automatically correlate user experience with network transport behavior. Administrators can use Forwarding Insights to:
* Identify whichpath (primary, secondary, or backup)an application flow takes.
* Viewreal-time performance metricssuch as round-trip delay and packet loss per path.
* Understandwhy path selection decisions were made, based on policy or link health.
Other options are incorrect:
* A. Router Insightsfocuses on routing and device-level performance, not per-application path details.
* B. WAN Edge Insightsprovides device health and site connectivity data, not application-level forwarding analytics.
* D. Platform Insightscovers cloud infrastructure performance, not WAN traffic analysis.
Thus, the correct answer isC. Forwarding Insights.
References:- Juniper Mist WAN Assurance and Forwarding Insights Technical Guide- Juniper Mist AI- Driven SD-WAN Operations Documentation- Juniper Mist Cloud Analytics and Insights Overview
NEW QUESTION # 42
You want to override radio frequency templates in Juniper Mist.
Which two settings in the UI will accomplish this task? (Choose two.)
- A. WLAN Templates
- B. AP-specific settings
- C. Device Profiles
- D. Labels
Answer: B,D
Explanation:
InJuniper Mist Wireless Assurance, radio frequency (RF) configurations such as transmit power, channel width, and band selection are typically managed throughRF Templatesat the site or organization level.
However, administrators canoverride RF Template settingsfor specific devices or groups of devices when custom configurations are required.
According to theJuniper Mist Wireless Assurance Configuration Guide, RF template overrides can be accomplished using two UI configuration options:
"Administrators can apply overrides to RF settings either per access point using AP-specific settings or across a defined group of APs using labels."
* AP-specific settings (A):Allow administrators to manually modify the radio parameters of a single access point, overriding site-level template values.
* Labels (C):Used to group access points logically (e.g., by floor or building) and apply customized configurations or overrides to those APs collectively.
Device Profiles (B)are used for wired switch configurations, andWLAN Templates (D)control SSID-related configurations-not RF parameters.
Therefore, the correct answers areA. AP-specific settingsandC. Labels.
References:- Juniper Mist Wireless Assurance Configuration and RF Management Guide- Juniper Mist Cloud Template and Site Configuration Documentation- Juniper Mist AI Operations and RF Optimization Overview
NEW QUESTION # 43
How often does Marvis Minis execute automatic validations?
- A. Every 30 minutes
- B. Every day
- C. Every hour
- D. Every week
Answer: C
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 # 44
Which two features are part of Juniper Mist Wired Assurance? (Choose two.)
- A. port profiles
- B. template-based configuration for routers
- C. WxLAN policies
- D. template-based configuration for switches
Answer: A,D
Explanation:
Juniper Mist Wired Assurance delivers robust automation for campus and remote switches by supporting both template-based configuration for switches and port profiles as core features. According to the official Juniper Mist documentation, "Wired Assurance provides cloud-managed switch configuration through scalable templates. These templates are set at the organization or site level, standardizing VLANs, port settings, security options, and other operational parameters for all managed EX and QFX series switches." Furthermore, port profiles allow administrators to automate port assignment and behavior based on dynamic criteria such as LLDP information or MAC addresses: "Dynamic port profiles are applied automatically when specific criteria are detected, simplifying operational workflows and reducing manual errors." Features like "template-based configuration for routers" and "WxLAN policies" are not part of Mist Wired Assurance. Router configuration is enabled in Routing Assurance, and WxLAN is a Juniper-specific campus automation solution, not directly related to switch management.
Verification:
This aligns with the selections marked in your image ("template-based configuration for switches" and "port profiles"). It is fully verified by Juniper's official guides for Mist Wired Assurance.
References:
Juniper Mist Wired Assurance Configuration Guide
Port Profiles Overview | Mist
Config Templates and Hierarchy - Mist
NEW QUESTION # 45
Setting the correct time zone for a Mist site provides which benefit?
- A. optimization of network performance based on time-of-day usage
- B. synchronization of device clocks for accurate scheduling of events
- C. enablement of remote access to the site during specific time slots
- D. facilitation of troubleshooting by aligning event timestamps with local time
Answer: D
Explanation:
Time Zone Importance: Setting the correct time zone for a Mist site ensures that all events and logs are timestamped accurately according to the local time of the site. This is crucial for effective monitoring and troubleshooting.
Facilitation of Troubleshooting: By aligning event timestamps with the local time, network administrators can correlate events more easily with specific incidents reported by users, thereby simplifying the troubleshooting process.
NEW QUESTION # 46
Exhibit:
Referring to the exhibit, what does the AI Validated notification for the WAN Edge tell the user?
- A. Marvis Actions has automatically fixed the WAN Edge issue at saltlakecity-branch1.
- B. Marvis has verified that the issue is resolved and has classified the issue as AI-validated.
- C. Marvis Actions has encountered an error that requires restarting.
- D. Marvis has confirmed that there is an issue at saltlakecity-branch1.
Answer: B
Explanation:
The AI Validated notification for the WAN Edge signifies that Marvis has verified the underlying issue as resolved and has classified the incident as AI-validated. According to the Juniper Mist documentation, when Marvis completes its troubleshooting workflow and determines that a previously surfaced issue is cleared - either by automated remediation or through confirmation of operational health - Marvis marks the issue as
"AI Validated." This indicates both the end of the incident lifecycle and the confidence level provided by Mist's AI that the environment is healthy and functioning as expected. The notification does not mean an error remains, nor does it confirm merely the presence of an issue, nor that Marvis performed only an automatic fix (which may also be the case, but the "AI Validated" label is for resolved/confirmed resolution status). This is most often seen as a final state within the Marvis Actions interface on the WAN Edge.
Reference:Juniper Mist Marvis Documentation - AI Validation, Issue Lifecycle in Marvis Actions
NEW QUESTION # 47
Under which category would you identify bad cables using Marvis Actions?
- A. Connectivity
- B. security
- C. Layer 1
- D. Clients
Answer: C
Explanation:
Bad cables are identified under the Layer 1 category within Marvis Actions. Juniper Mist's documentation states: "Use the Actions dashboard to resolve Layer 1 issues. When you click the Layer 1 button on the Action dashboard, all available Layer 1 actions appear. This category currently contains only one action: bad cable." Marvis can detect and alert for bad cables based on frame errors, link statistics, and AP/Switch behavior, all under the Layer 1 category. Connectivity, security, and client issues are handled under their respective action categories, but bad cabling is specifically monitored and detected as a physical (Layer 1) fault.
Reference:Layer 1 Actions | Mist , Marvis AI Operations Guide
NEW QUESTION # 48
Exhibit:
Referring to the exhibit, which percentage of Coverage was unsuccessful?
- A. 79%
- B. 9%
- C. 21%
- D. 15%
Answer: C
Explanation:
InJuniper Mist Wireless Assurance, theCoverage SLE (Service Level Expectation)measures the quality and consistency of Wi-Fi signal coverage across an organization's wireless infrastructure. It provides insight into how well clients can connect to access points with sufficient signal strength and quality.
According to theJuniper Mist AI Operations and Analytics Guide, the Coverage SLE is defined as:
"The percentage of client connections that meet the minimum signal strength threshold required for satisfactory performance. Sub-threshold values represent areas where coverage is inadequate or inconsistent." In the exhibit, the SLE visualization shows79% successful coverageand21% unsuccessful coverage, meaning that21% of connection attempts or client areas did not meet the desired signal strength threshold. These failures may be caused by factors such as:
* Insufficient AP density or placement.
* RF interference from neighboring devices.
* Physical obstructions impacting signal propagation.
Thus, theunsuccessful coverage percentage is 21%, indicating potential areas where additional APs or configuration optimization may be needed to improve user experience.
References:- Juniper Mist Wireless Assurance and SLE Documentation- Juniper Mist AI Operations and Troubleshooting Guide- Juniper Mist Cloud Analytics and Coverage Metrics Overview
NEW QUESTION # 49
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