Juniper Updated JN0-253 Exam Questions and Answers by hashim

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.

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.

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.

InJuniper Mist Wired Assurance, assigningrolesto switches is a key configuration mechanism for deploying consistent network policies across multiple devices. Switch roles act as logical identifiers that bind devices to specificconfiguration templatesorpolicy profiles, ensuring standardized setup and reducing manual configuration overhead.

According to theJuniper Mist Wired Assurance Configuration and Template Management Guide:

“Switch roles are used to group devices based on function or location and automatically apply predefined configuration templates and policies at scale.”

This enables administrators to:

Automatically assign VLANs, port profiles, and policies to multiple switches simultaneously.

Simplify deployment for large organizations with multiple sites.

Ensure uniform compliance with enterprise configuration standards.

Roles arenot usedto configure WLANs (wireless function), manage users, or directly monitor traffic — those tasks are handled through other Mist AI services.

Therefore, the correct answer isC. To assign configurations at scale.