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Juniper的JN0-481認證考試是現在IT領域非常有人氣的考試。取得這個考試的認證資格對想晉升的人們來說是最好的，也是最可以看到效果的選擇。而且，借助這個考試你也可以提高自己的技能，掌握更多的對工作有用的技術。這樣你就可以更好地完成你的工作，向別人展示你的超強的能力。也只有这样你才可以获得更多的发展机会。
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問題 #85
In a three-stage Clos network, what are important key design aspects of a data center fabric? (Choose two.)
答案：A,D
解題說明：
A three-stage Clos (leaf-spine) data center fabric separates roles to keep forwarding predictable and scalable. The leaf layer is the attachment point for endpoints, so servers connect to leaf devices. This is where the fabric accepts workload traffic, applies edge policies, and provides tenant/service constructs (for EVPN-VXLAN fabrics, the leafs typically act as VTEPs and host IRB gateways as required). The spine layer provides the non-blocking transit core between leafs using L3 underlay routing and ECMP, but it is not the place where servers attach directly.
For north-south connectivity, a typical three-stage Apstra data center architecture includes border leaf switches. These border devices provide the controlled connection point between the fabric and external networks (Internet/WAN/DCI or upstream services). As a result, fabric traffic enters and exits the border devices, not the spines. This design keeps the spines dedicated to high-speed east-west transit and simplifies operations: external routing policies, security controls, and inter-domain handoffs are concentrated at the border, while the spines remain a uniform L3 transit tier. In Junos v24.4 EVPN-VXLAN deployments, this separation also helps maintain clean overlay boundaries and consistent underlay behavior across the fabric.
Verified Juniper sources (URLs):
https://www.juniper.net/documentation/us/en/software/juniper-data-center-assurance/user-guide/topics/concept/dc-network-topology-on-dc-assurance.html
https://www.juniper.net/documentation/us/en/software/jvd/jvd-3-stage-datacenterdesign-with-juniper-apstra/solution_architecture.html
https://www.juniper.net/content/dam/www/assets/white-papers/us/en/design-considerations-for-spine-and-leaf-ip-fabrics.pdf
問題 #86
Which two statements about ESI values are correct for the server connections to the fabric shown in the exhibit? (Choose two.)
答案：B,C
解題說明：
To answer this question, we need to understand the concept of ESI values in EVPN LAGs. An ESI is a 10-byte value that identifies an Ethernet segment, which is a set of links that connect a multihomed device (such as a server) to one or more PE devices (such as leaf switches) in an EVPN network. The same ESI value must be configured on all the PE devices that connect to the same Ethernet segment. This allows the PE devices to form an EVPN LAG, which supports active-active or active-standby multihoming for the device. The ESI value can be manually configured (type 0) or automatically derived from LACP (type 1) or other methods. In the exhibit, Server A is connected to two leaf switches (QFX 5210) using a LAG with LACP enabled. Server B is connected to three leaf switches (QFX 5120) using a LAG with LACP enabled.
問題 #87
What is the primary reason for creating an Apstra worker node?
答案：C
解題說明：
In Apstra 5.1, the worker node's primary purpose is to add scalable runtime capacity to an Apstra cluster by hosting off-box services that would otherwise consume resources on the controller. Specifically, worker nodes run containerized services such as off-box device agents (used to communicate with and manage devices) and Intent-Based Analytics (IBA) components (such as probes and analytics-related services). This design keeps the controller node focused on cluster management and control-plane functions (API handling, cluster-wide state, blueprint control workflows), while shifting resource-intensive operational services to worker nodes.
As your fabric grows-more switches, more telemetry, more devices requiring agent connectivity-CPU and memory demand increases notably, especially when IBA is enabled. Adding worker nodes allows you to scale those container workloads horizontally without redesigning the fabric or reducing analytics coverage. In a Juniper data center built on EVPN-VXLAN with Junos v24.4 leaf-spine roles, this separation helps ensure that Apstra can continuously validate intent, process streaming telemetry, and maintain device communications reliably at scale. Worker nodes therefore exist primarily to offload and scale operational agents and IBA services, improving performance and resilience for larger deployments.
問題 #88
What are two agent processes that operate within the Juniper Apstra device agent? (Choose two.)
答案：B,C
解題說明：
Within the Juniper Apstra device agent, two of the key processes are:
- Telemetry agent, which collects operational and state data from the device and reports it back to the Apstra server.
- Deployment agent, which applies configuration changes delivered by Apstra to the device.
問題 #89
You must configure a static route for traffic to exit a configured routing zone. In the Juniper Apstra Ul, where would you accomplish this task?
答案：A
解題說明：
To configure a static route for traffic to exit a configured routing zone, you need to use the Connectivity Templates feature in the Juniper Apstra UI. A Connectivity Template is a set of configuration parameters that can be applied to a device or a group of devices in a blueprint. You can use Connectivity Templates to configure static routes, BGP, OSPF, and other network services. To create a Connectivity Template, you need to go to the Staged tab and select Connectivity Templates from the left menu. Then, you can click on the + icon to create a new template. You can specify the name, description, and scope of the template. The scope determines which devices or device groups the template will be applied to. You can also specify the order of the template, which determines the priority of the template when multiple templates are applied to the same device. After creating the template, you can add configuration items to the template. To add a static route, you need to select Static Route from the drop-down menu and enter the destination network, subnet mask, and next- hop IP address. You can also specify the administrative distance and the track object for the static route. After adding the configuration items, you need to save the template and commit the changes to the blueprint.
問題 #90
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