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You are performing an upgrade to your switches in your network. You want to ensure that the upgrade can be performed without interrupting traffic. In the Juniper Apstra UI, which deploy mode should be used to accomplish this task?
Answer : C
In Apstra, Deploy Mode = Drain is the operational mechanism used to gracefully remove a switch from active forwarding before performing maintenance such as an OS upgrade. Drain mode is specifically intended to drain traffic while preserving fabric stability, so that maintenance can be executed with minimal to no application impact, provided the fabric design has sufficient redundancy (for example, ECMP in the underlay and dual-homing/ESI for server attachments). In an EVPN-VXLAN IP fabric, taking a leaf or spine abruptly out of service can cause transient loss of reachability as underlay adjacencies reconverge and the overlay recalculates paths. By placing the device into Drain, Apstra adjusts intent so that traffic is shifted away from the device as much as possible, reducing dependency on it before the upgrade begins.
This is different from Undeploy, which removes Apstra-rendered configuration and is generally used for decommissioning; if a device is carrying traffic, Apstra guidance is to drain first. Ready is a pre-deploy state used in lifecycle workflows, not a maintenance traffic-shifting mode. Deploy keeps the device fully participating. Therefore, for a maintenance window where the goal is ''upgrade with minimal interruption,'' the correct mode is Drain, then perform the Junos v24.4 upgrade, and finally return the device to Deploy.
Verified Juniper sources (URLs):
https://www.juniper.net/documentation/us/en/software/apstra4.2/apstra-drain-mode/apstra-drain-mode.pdf
https://www.juniper.net/documentation/us/en/software/apstra4.2/apstra-user-guide/topics/topic-map/deploy-mode-update-datacenter.html
https://www.juniper.net/documentation/us/en/software/apstra6.0/apstra-user-guide/topics/topic-map/device-config-lifecycle.html
What does VXLAN use to uniquely label and identify broadcast domains?
Answer : C
In a VXLAN overlay, each Layer 2 broadcast domain (the logical equivalent of a VLAN/bridge domain) is identified by a 24-bit VXLAN Network Identifier (VNI) carried in the VXLAN header. This VNI is what allows the overlay to scale far beyond traditional VLAN space (12-bit VLAN IDs), enabling up to ~16 million distinct segments. In an EVPN-VXLAN data center fabric, Junos v24.4 leaf switches operate as VTEPs and map local bridge domains (often associated with VLANs on server-facing ports) to a VNI. When traffic is sent across the routed underlay, the leaf encapsulates Ethernet frames into VXLAN packets and inserts the VNI so the receiving VTEP can place the frame into the correct broadcast domain on decapsulation.
Apstra 5.1 abstracts this mapping through virtual networks and resource allocation: when you define a VXLAN-based virtual network, Apstra allocates a VNI from the appropriate pool and consistently programs the necessary constructs on all participating leaves. The key point is that VNI is the unique identifier in the VXLAN data plane used to label the broadcast domain across the IP fabric; VLAN IDs may exist locally at the edge for tagging, but the globally significant overlay identifier is the VNI.
Verified Juniper sources (URLs):
https://www.juniper.net/documentation/us/en/software/junos/evpn/topics/topic-map/sdn-vxlan.html
An operator is working on a capacity-planning exercise. The operator needs to examine the pre-built time-series information regarding link utilization. In the Juniper Apstra UI, which top-level tab would the operator have to access to find this information?
Answer : C
In Apstra 5.1, capacity planning based on pre-built time-series telemetry (such as link utilization trends) is part of Intent-Based Analytics (IBA). IBA is where Apstra ingests streaming telemetry from fabric devices, stores it as time-series data, and presents it through built-in analytics views (dashboards/widgets) and probes. Because the question specifically calls out ''pre-built time series information regarding link utilization,'' the correct UI location is the Analytics top-level tab within the blueprint.
The Active tab is primarily oriented to operational state and day-2 workflows (for example, viewing live state, queries, and device-level operational views). The Staged tab is where you modify intent (physical/virtual design, policies, catalog items) prior to committing and deploying. The Dashboard provides a high-level blueprint overview and navigation, but the drill-down and time-series analytics views that support trending and capacity analysis are accessed via Analytics.
In an EVPN-VXLAN fabric using Junos v24.4, link utilization time-series is particularly valuable because underlay congestion can degrade overlay performance (BGP convergence behavior, ECMP distribution effectiveness, and endpoint experience). Apstra's Analytics tab centralizes these metrics so operators can evaluate utilization baselines, identify sustained hot links, and support proactive actions (rebalancing, adding capacity, or adjusting design intent) without relying on ad-hoc per-device CLI polling.
Verified Juniper sources (URLs):
https://www.juniper.net/documentation/us/en/software/apstra5.1/apstra-custom-telemetry-collection-guide/topics/concept/apstra-telemetry-and-intent-based-analytics.html
Within Managed Devices in the Juniper Apstra Ul, you notice that several devices have the OOS-Quarantined status. The devices cannot be added to any blueprint. Which action would solve this problem?
Answer : A
When an agent installation is successful, devices are placed into the Out of Service Quarantined (OOS-QUARANTINED) state using the Juniper Apstra UI. This state means that the device is not yet managed by Apstra and has not been assigned to any blueprint. The device configuration at this point is called Pristine Config. To make the device ready for use in a blueprint, you need to acknowledge the device, which is a manual action that confirms the device identity and ownership.Acknowledging the device changes its status to Out of Service Ready (OOS-READY)12.Reference:
Managing Devices
AOS Device Configuration Lifecycle
When creating a probe, an operator wants to make it easy to view that probe's output. In this scenario, which element must be created to accomplish this task?
Answer : A
In Apstra IBA, a probe is a directed graph made of stages (data you can inspect) and processors (operations that transform/aggregate data). While stages can be inspected during probe construction, the simplest operational way to make probe results readily consumable by day-2 operators is to publish them through widgets that can be placed on Analytics dashboards. A dashboard widget is the visualization and presentation object that renders either (1) counts of anomalies or (2) the outputs produced by stages and processors in a probe. Creating a widget tied to the probe output means the operator can open a dashboard and immediately see the metric trends, tables, or anomaly indicators without navigating into probe internals.
A predefined probe is optional content (a starting template) and is not required for visibility. Processors and stages are internal probe building blocks, but they do not, by themselves, create an operator-friendly view in the UI. In a Junos v24.4 EVPN-VXLAN fabric, this is especially useful for link utilization, drops, latency signals, or any custom telemetry pipeline: you build the probe logic once, then expose the key results in a widget that persists across operational workflows and can be shared on standardized dashboards for capacity planning and troubleshooting.
Verified Juniper sources (URLs):
https://www.juniper.net/documentation/us/en/software/apstra4.2/apstra-user-guide/topics/concept/widgets.html
https://www.juniper.net/documentation/us/en/software/apstra4.2/apstra-user-guide/topics/topic-map/widget-stage-create.html
https://www.juniper.net/documentation/us/en/software/apstra4.2/apstra-user-guide/topics/concept/probes.html
