Juniper Mist AI Wired, Specialist JN0-460 JNCIS-MistAI-Wired Exam Questions

Answer : D

In theJuniper Mist AI for Wired dashboard, administrators can select one or more switch ports (as shown in the exhibit, e.g., port ge-0/0/25 on an EX4100-48MP). Once configuration changes are made --- such as VLAN assignment, port profiles, PoE settings, or administrative state --- theSave buttonmust be clicked to confirm and apply those changes to the device.

''When making configuration changes in the Mist switch interface, the Save button must be used to confirm the modifications. Clicking Save applies the selected port settings to the switch through Mist Cloud.''

Option Ais incorrect: saving does not create a backup. Backups and snapshots are handled through Mist's configuration archive, not via the Save button.

Option Bis incorrect: Save does not reset configuration; instead, it commits changes.

Option Cis incorrect: there is no preview function tied to Save.

Option Dis correct: the Save button is explicitly forapplying configuration changesto the selected switch or port(s).

Juniper Mist AI for Wired -- Switch Port Configuration Guide

Juniper Mist AI for Wired -- Wired Assurance Administration Guide

Juniper Mist Documentation -- Managing Switch Interfaces

Answer : D

Anorganization-level configuration templatecan only be applied tosite groups, not to individual sites.

Therefore, a single site such as Site A cannot be directly specified inside an org-level template.

Juniper Mist Wireless and Wired Deployment Guide -- Configuration Templates and Hierarchy

Mist Cloud Configuration Hierarchy Overview

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Answer : C

According to Juniper Networks' validated designs for campus fabrics, the campus fabric core-distribution with edge-routed bridging (ERB) is the optimal architecture when high volumes of east-west traffic are present and access switches are restricted to Layer 2 operations. In an ERB design, the EVPN-VXLAN fabric extends from the core switches to the distribution switches.1 The critical differentiator is the placement of the default gateways (Integrated Routing and Bridging or IRB interfaces). In the ERB model, these gateways are moved from the core to the distribution layer, which effectively acts as the 'edge' of the EVPN fabric.

By placing the Layer 3 gateways at the distribution layer, inter-VLAN (east-west) traffic is routed closer to the endpoints.2 This prevents the 'hairpinning' effect found in Centrally-Routed Bridging (CRB) architectures, where traffic must travel all the way to the core layer to be routed between subnets before returning down to the distribution and access layers. This reduction in latency and core-link utilization is essential for modern campus environments with high server-to-server or client-to-client traffic patterns.

Furthermore, this architecture specifically accommodates Layer 2 access switches. In the ERB core-distribution model, the access switches are not part of the EVPN-VXLAN overlay; instead, they connect to the distribution tier using standard Link Aggregation Control Protocol (LACP) or ESI-LAG. This allows organizations to leverage existing legacy or lower-tier access switches that do not support advanced VXLAN capabilities while still benefiting from a robust, scalable EVPN-VXLAN fabric at the distribution and core layers.5 In contrast, while the campus fabric IP Clos also excels at handling east-west traffic, it requires the access switches themselves to perform VXLAN encapsulation/decapsulation (acting as VTEPs), which contradicts the requirement for access switches to operate only at Layer 2.

Answer : A

According to Juniper Networks technical documentation regarding 'Bridging and VLANs,' Layer 2 network segmentation is primarily achieved through the implementation of Virtual Local Area Networks (VLANs). While VLANs provide critical segmentation services by grouping related devices into independent logical networks and containing broadcasts within specific domains, they are bound by the architectural constraints of the IEEE 802.1Q standard.

A fundamental limitation of this traditional Layer 2 approach is the address space of the VLAN identifier. The 802.1Q header allocates exactly 12 bits for the VLAN ID (VID). This mathematical constraint limits the total number of possible VLANs to 4,096 ($2^{12}$). Within the Junos operating system, VLAN IDs 0 and 4,095 are strictly reserved for system internal functions and cannot be assigned to user traffic, resulting in a maximum of 4,094 usable VLANs for network segmentation.

In modern enterprise environments---especially those involving large-scale multitenancy, cloud services, or high-density campus deployments---this 4,094 limit often becomes a significant bottleneck. Network administrators can exhaust this pool when attempting to provide granular isolation for thousands of unique device types, departments, and guest users. To overcome this specific limitation, Juniper recommends moving toward EVPN-VXLAN campus fabrics. VXLAN technology replaces the 12-bit VLAN tag with a 24-bit VXLAN Network Identifier (VNI), which theoretically supports over 16 million unique segments. This vast increase in scalability allows for the creation of administrative domains that far exceed the capabilities of traditional Layer 2 Ethernet bridging. While Layer 2 domains also face challenges related to Spanning Tree Protocol (STP) complexity and large broadcast diameters, the numeric exhaustion of the VLAN ID space remains the most definitive hardware-level limitation of standard Layer 2 segmentation.

Answer : D

According to Juniper's Validated Designs (JVD) for campus fabrics, the Campus Fabric IP Clos (often referred to as a 5-stage Clos) is the architecture specifically engineered for high-scale environments supporting 10,000+ users. This design is characterized by extending the EVPN control plane and VXLAN data plane all the way to the access layer. By terminating VXLAN tunnels at the access switch---functioning as a Virtual Tunnel Endpoint (VTEP)---the network can seamlessly support both Layer 2 and Layer 3 devices directly at the edge of the fabric.

The primary driver for choosing IP Clos in large-scale deployments is its superior scalability. In this model, the core switches are shielded from the massive table sizes required to learn thousands of individual endpoint MAC and IP addresses. Instead, core devices only need to maintain reachability to the loopback addresses of the access layer switches. This reduction in the 'flood and learn' pressure on the core is critical as the number of endpoints grows, ensuring that the core can scale far into the future with predictable growth.

Additionally, the IP Clos architecture provides the most flexible environment for microsegmentation using Group-Based Policies (GBP) and macrosegmentation using Virtual Routing and Forwarding (VRF) instances. Since routing occurs at the access device, 'east-west' traffic between local endpoints remains efficient and does not need to traverse the distribution or core tiers. While EVPN Multihoming and Core-Distribution (CRB/ERB) models are effective for smaller sites or brownfield environments where access switches are legacy Layer 2-only devices, only the IP Clos architecture provides the end-to-end VXLAN capability required for high-density, future-proof campus fabrics.

Answer : D

When a switch is successfully onboarded into Mist Cloud but shows''Unassigned,''it means the device has been claimed into the organization but hasnot yet been assigned to a specific site.

''After claiming switches into an organization, you must assign each switch to a site for it to transition from Unassigned to Connected state and begin receiving configuration and telemetry updates.''

Option A:Incorrect --- rescanning is not needed once the device is claimed.

Option B:Incorrect --- reboots are unnecessary for assignment recognition.

Option C:Incorrect --- these commands are for connectivity troubleshooting, not site assignment.

Option D:Correct--- assigning each switch to itsintended siteenables full Mist management and connectivity state.

Juniper Mist AI for Wired -- Switch Onboarding and Site Assignment Guide

Juniper Mist Cloud -- Device States and Adoption Workflow

Juniper Wired Assurance -- Site Management Overview

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Answer : C

Juniper Wired Assurance licensingis based on switch port count and supports a range of hardware platforms. Subscriptions are available for12-port,24-port, and48-portmodels across the EX Series portfolio.

''Wired Assurance subscriptions are available for all supported EX Series switches in 12-port, 24-port, and 48-port license options, aligning to switch hardware configurations.''

Option A:Incorrect --- 24-port only does not cover all options.

Option B:Incorrect --- 12- and 24-port licenses exist, but 48-port is also supported.

Option C:Correct--- Mist supports12-, 24-, and 48-portsubscription tiers.

Option D:Incorrect --- 12-port alone is incomplete.

Juniper Mist AI for Wired -- Licensing and Subscription Guide

Juniper Mist AI Cloud -- Wired Assurance Licensing FAQ

Juniper Networks EX Series -- Licensing and Port-Based Subscription Matrix