Practice Free JN0-460 JNCIS-MistAI-Wired Exam Questions Answers With Explanation

According to Juniper Mist documentation, the term "Adopting a Switch" specifically refers to the process of bringing an existing, already-configured switch—often termed a brownfield device—under the management of the Juniper Mist cloud. This is distinct from the "claiming" process, which is reserved for greenfield environments where new, factory-default switches are added using a QR code or activation code.

In a brownfield scenario, the switch is typically already in production or has a pre-existing local configuration that must be preserved or integrated into the Mist AI-driven dashboard. To adopt such a switch, the administrator must manually interact with the switch's Command Line Interface (CLI). The Mist portal provides a unique adoption command—a string of Junos OS configuration—that includes the specific URL for the Mist cloud and the organization’s unique registration token. Once this command is pasted into the switch's CLI and committed, the switch initiates an outbound connection to the Mist cloud via TCP port 2200 or 443.

Upon successful connection, the switch's status changes from "Unassigned" to "Connected" in the Mist dashboard. This transition allows the Mist AI engine to begin collecting telemetry, monitoring Service Level Expectations (SLEs), and performing automated troubleshooting. While the adoption process allows for "monitoring only" mode to avoid disrupting existing services, it is the fundamental first step for transitioning legacy Juniper infrastructure into a modern, cloud-managed Wired Assurance environment. This workflow is essential for organizations looking to leverage Marvis AI and automated operations without having to factory-reset their entire existing network.

Route targets (RTs)are extended BGP communities used inMultiprotocol BGP (MP-BGP)forEVPN-VXLANto control route import/export between VRFs.

“A route target identifies the VRF instances that should import or export specific MP-BGP routes. It enables the association of EVPN routes with particular VRFs in multi-tenant environments.”

Option A:Incorrect — EVPN family support is identified through BGP capabilities, not RTs.

Option B:Incorrect — that’s handled by BGP EVPN negotiation, not route targets.

Option C:Correct— route targets definewhich VRFs import/export BGP routes.

Option D:Incorrect — RTs can be manually configured and reused where necessary.

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.

According to the Juniper Mist dashboard's firmware management interface shown in the exhibit, several key details of the switch upgrade process are visible. The "Upgrade switch firmware" dialog box is a standard component of Juniper Mist Wired Assurance used to manage Junos OS updates across the fabric.

The correct statement is that the switch will reboot after the upgrade. This is explicitly confirmed by the checkbox labeled "Reboot switch after image copy," which is currently selected in the exhibit. In Juniper's cloud-managed workflow, once the new software image is successfully transferred from the Mist cloud to the switch's local storage, the system requires a reboot to initialize the new Junos OS kernel and complete the installation process5. While some platforms support non-disruptive upgrades, the standard procedure for EX-series switches in a standalone or Virtual Chassis configuration typically involves a scheduled reboot to ensure the new version is correctly applied.

The other options are incorrect based on the visual evidence provided in the exhibit.

Option A: The exhibit clearly identifies the "Switch Model" as an EX2300-C-12P (the 'P' designating PoE support), not an EX2300-C-12T88.

Option C: The dialog box explicitly states "Total Switches selected to upgrade: 1," confirming this is a single-device operation rather than a bulk upgrade.

Option D: The "Upgrade to Version" field is set to 19.3R1.8, which indicates the target version, not the previous version10101010.

By providing these granular controls, Juniper Mist allows administrators to maintain strict version compliance across the site while choosing whether to immediately reboot or stage the image for a later maintenance window.

Juniper Mist is built on a fully open andRESTful API architecture, allowing programmatic access to all functions.

Administrators and developers can automate switch provisioning, monitoring, and troubleshooting directly via the REST API.

This open design supports JSON data formatting and HTTPS authentication, ensuring secure integration with external systems.

Comprehensive and Detailed Explanation From Exact Extract:

InEVPN-VXLANarchitectures, theVXLAN Tunnel Endpoint (VTEP)is the logical interface responsible for encapsulating and de-encapsulating Layer 2 Ethernet frames into VXLAN packets.

Each participating switch — typically the access or distribution node — hosts aVTEPthat maps local VLANs to VXLAN Network Identifiers (VNIs).

When a packet leaves a local VLAN, the VTEP encapsulates it in a VXLAN header and routes it through the underlay IP fabric.

When received at the destination VTEP, the frame is de-encapsulated and delivered to the appropriate local VLAN.

“VTEPs in an EVPN-VXLAN campus fabric perform MAC-to-VNI mapping and encapsulate/decapsulate traffic between virtualized network segments, allowing seamless Layer 2 and Layer 3 connectivity across an IP underlay.”

According to Juniper Networks' EVPN-VXLAN documentation, devices that perform the encapsulation and de-encapsulation of Ethernet frames into VXLAN UDP packets at the edge of the network are known as Virtual Tunnel Endpoints (VTEPs)1111. In the context of a campus fabric overlay, these devices often function as L2 gateways when they bridge traditional Layer 2 traffic from end-user devices across a Layer 3 IP fabric.

The exhibit demonstrates a 3-stage IP Clos architecture where access1 and access3 are explicitly identified as VTEP endpoints. A VXLAN tunnel is shown originating at access1 and terminating at access3, allowing "User1" and "Server1"—both located on the same 10.1.1.0/24 subnet—to communicate as if they were on the same physical Layer 2 segment despite being separated by a Layer 3 IP Fabric (172.16.0.0/24). In this scenario, access1 and access3 fulfill the L2 gateway role by mapping the local VLAN traffic to a specific VXLAN Network Identifier (VNI) for transport across the underlay3.

As L2 gateways, these switches maintain the bridge table for the overlay network, learning MAC addresses from local ports and via the EVPN control plane from remote VTEPs4. This architecture allows for seamless Layer 2 mobility and connectivity across complex routed infrastructures while eliminating the need for Spanning Tree Protocol (STP) in the core5555. In contrast, options like "VNI" refer to the segment ID itself rather than a device role, and "root bridge" refers to an STP-specific role that EVPN-VXLAN is designed to move away from in a modern fabric.

Within Mist Insights,Client Eventsshow state transitions such asreassociationand IP-level issues likeDHCP Denied.

These help correlate connectivity issues across wired or wireless edge connections.

Forgreenfield onboarding, switches are newly deployed and must be claimed into Mist Cloud. Juniper Mist offers multiple claim options to simplify large-scale onboarding.

“You can claim switches using the device’s QR claim code, by bulk importing from a sales order, or through API-based automation for large deployments. Each of these methods securely associates the devices to your organization in Mist Cloud.”

Option A:Incorrect — serial number alone is not sufficient for claiming.

Option B:Correct— claim codes (QR) uniquely identify switches.

Option C:Correct— bulk claim from a sale order streamlines large deployments.

Option D:Correct— APIs support automated claiming and provisioning workflows.

Option E:Incorrect — MAC address alone cannot be used to claim devices.

In Mist,sitesrepresent the physical or logical grouping of devices within an organization.

You create and manage a site configuration under theLocationhierarchy in the Mist UI.

Each site inherits organization-level settings but can override or customize specific configurations such as VLANs, templates, or switch settings.

InMist Cloud,site variablesare used to store and reference common configuration values (such as VLAN IDs, subnet addresses, or gateway IPs) that are reused across multiple devices and templates within a site.

“Site variables allow administrators to define reusable configuration parameters that can be referenced in multiple templates or device configurations, ensuring consistency and reducing manual errors.”

Option A:Incorrect — applies configuration directly, not reusable references.

Option B:Correct— site variables enable you to reference the same VLAN or value in multiple configurations (switches, WLANs, etc.).

Option C:Incorrect — WLAN templates are for wireless SSID configuration.

Option D:Incorrect — switch templates define static configuration but don’t store shared variables.

According to Juniper Networks' EVPN documentation, an EVPN Type 4 route, also known as an Ethernet Segment route, is a critical component of the BGP EVPN control plane used specifically in multihoming scenarios. When a Customer Edge (CE) device is connected to two or more Provider Edge (PE) routers via a Link Aggregation Group (LAG), these PE routers must coordinate to manage traffic flow and prevent network loops.

The primary purpose of the Type 4 route is to enable Designated Forwarder (DF) election. In a multihomed Ethernet Segment (identified by a unique Ethernet Segment Identifier or ESI), only one PE router—the Designated Forwarder—is permitted to forward Broadcast, Unknown unicast, and Multicast (BUM) traffic from the EVPN core to the CE device. Without this election process, multiple PE routers would forward the same BUM packets to the CE, leading to traffic duplication and potential broadcast storms.

The workflow begins when a PE router is configured with an ESI on a physical or logical interface; it then generates and advertises a Type 4 route to all other PE routers in the network. This route carries the ESI and an "ES-import" extended community, which allows other PEs connected to the same segment to automatically discover their peers. Once these "peering" PEs are discovered, they collectively execute a DF election algorithm—such as the default modulo-based algorithm or the newer preference-based algorithm—to select the DF and Backup Forwarder (BDF) for each VLAN or bridge domain. By ensuring a deterministic and synchronized selection of the forwarder, Type 4 routes provide the foundational stability required for active-active and active-standby multihoming in modern campus and data center fabrics.

EVPN, when used with VXLAN, leveragesBGP MPLS/VXLAN control plane mechanisms. To prevent overlapping IP prefixes between different tenants or sites, EVPN uses aRoute Distinguisher (RD).

“In EVPN-VXLAN, the route distinguisher (RD) makes routes unique when overlapping IP prefixes or MAC addresses are advertised between multiple tenants or sites.”

Option A(designated forwarder) applies to multi-homing in EVPN, not prefix uniqueness.

Option B(Layer 2 gateway) does not prevent IP overlap; it bridges VLANs.

Option D(ESI) is used for identifying multi-homed Ethernet segments, not to differentiate overlapping subnets.

Option C(Route Distinguisher) is correct, as it uniquely identifies routes even if the IP addresses are the same across sites.

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.

Link Layer Discovery Protocol (LLDP)is a Layer 2 discovery protocol that allows network devices to advertise identity and capabilities to directly connected neighbors. While LLDP is useful for basic topology discovery, it has two key limitations inWired Assurance client identification:

“LLDP operates at Layer 2 between directly connected devices and must be explicitly enabled on all participating network elements to provide neighbor information. It cannot discover devices beyond the first physical hop.”

Option A:Correct— LLDP must beconfigured and enabledon each network device to function.

Option B:Incorrect — LLDP itself is scalable but limited to direct adjacency.

Option C:Correct— LLDP only worksbetween directly connected devices.

Option D:Incorrect — not all clients support LLDP; however, the question asks forlimitations of using LLDP, not lack of support.

According to Juniper Mist documentation, the brownfield adoption process is utilized when bringing existing Juniper switches—which already have a local configuration—under the management of the Mist cloud. This process differs significantly from the greenfield "claiming" method, as it requires manual interaction with the device's management interface to establish the initial connection2.

A critical requirement for this process is that CLI access to the Juniper cloud-ready switch is required3. To initiate adoption, the administrator must log in to the switch via console or SSH and enter a specific set of Junos OS configuration commands provided by the Mist portal. These commands include the necessary parameters for the switch to establish an outbound SSH connection to the Mist cloud, typically using either TCP port 2200 or 443. Without direct CLI access to paste and execute these adoption strings, the switch cannot register itself with the organization's inventory in the dashboard.

Furthermore, because this process involves modifying the switch's local configuration file to add the Mist management parameters, you must perform a commit on the switch after adding the switch adoption commands7. In the Junos operating system, configuration changes reside in a candidate configuration buffer and do not take effect until a commit operation is successfully executed8. Once committed, the switch initiates the connection to Mist9. If the connection is successful, the switch status in the Mist dashboard will transition from "Unassigned" to "Connected," enabling AI-driven telemetry collection and Wired Assurance monitoring. This adoption method allows for a seamless transition of legacy infrastructure into a modern, cloud-managed environment without requiring a factory reset or the presence of a physical QR claim code.

InJuniper Mist Cloud, configuration hierarchy includesorganization-level templates,site-level configurations, andindividual switch configuration. Site and organization levels provide shared settings, while per-device details such as hostname or role are set individually.

“Device-specific attributes such as hostname, role, or management IP are configured under the individual switch configuration menu. Templates and site configurations apply globally, while individual configurations override device-level parameters.”

Option A:Incorrect — site configuration applies to all switches at a site, not unique details.

Option B:Incorrect — CLI configuration is not used when switches are managed by Mist Cloud.

Option C:Correct— each switch’s name and role are configured individually underSwitches ? Switch Configuration.

Option D:Incorrect — organization templates define global settings, not per-switch names.

InJuniper Mist Wired Assurance, SLEs (Service Level Expectations) measure key performance indicators for wired network quality.Throughput SLEmonitorsdata transfer quality, includinglatency, jitter, and packet loss, which directly impact real-time applications such as voice or video.

“The Throughput SLE provides visibility into end-to-end network performance by tracking latency, jitter, and packet loss, helping identify congestion or quality issues across wired connections.”

Option A (Throughput):Correct— this SLE includes jitter measurement.

Option B (Successful Connect):Tracks client connection success rate, not jitter.

Option C (Capacity):Monitors link utilization and load, not jitter.

Option D (Switch Health):Monitors device hardware and software health, not traffic performance.

According to Juniper Networks' software licensing documentation, Juniper utilizes a tiered subscription model for its Junos OS features on EX and QFX Series switches, specifically designed to align with different network use cases. This model is categorized into three main tiers: Standard, Advanced, and Premium. While basic Layer 2 and Layer 3 functions are included in the base or Standard tiers, advanced fabric technologies are reserved for the highest tier.

The Premium License is explicitly required to enable the full EVPN-VXLAN protocol stack on Juniper switches within a campus or data center fabric. As detailed in the Juniper Licensing User Guide, the Premium license serves as a superset that includes all functionality from the Standard and Advanced tiers, while specifically unlocking the advanced routing and virtualization features necessary for modern fabrics. Specifically, this license entitles the user to configure and run Multiprotocol BGP (MP-BGP) with the EVPN address family—which acts as the control plane—and the VXLAN encapsulation required for the data plane.

In a Juniper Mist Wired Assurance environment, there is a clear distinction between the cloud-based management subscription and the local Junos OS license. While the Wired Assurance subscription provides the AI-driven visibility, SLE monitoring, and automation capabilities through the Mist cloud, the Junos OS Premium license is a prerequisite on the physical hardware to execute the EVPN-VXLAN commands and maintain compliance with Juniper's End User License Agreement (EULA). For instance, on platforms like the EX4650 or QFX5120, attempting to commit a configuration involving EVPN without the appropriate Premium Feature License (PFL) will result in system warnings and protocol limitations, as these features are considered "high-value" software capabilities intended for complex, multitenant campus environments.

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).