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| Section | Objectives |
|---|---|
| Operations and Troubleshooting | - Troubleshooting routing and switching issues - Monitoring and verifying EVPN-VXLAN fabrics |
| EVPN-VXLAN Technologies | - EVPN control plane fundamentals - EVPN Type 2 and Type 5 routes - VXLAN data plane encapsulation |
| Junos Data Center Switching | - VLANs, trunking, and bridging concepts - Spanning Tree and alternatives in DC designs - QFX switch configuration and operation |
| Data Center Routing Protocols | - Underlay vs overlay network design - BGP in EVPN-based fabrics - OSPF and IS-IS in data center environments |
| Automation and Programmability | - Network configuration consistency and automation concepts - Junos automation basics (scripts, commit scripts) |
| Data Center Architecture Fundamentals | - Spine-leaf (Clos) architecture design - Layer 2 and Layer 3 data center fabric concepts - Redundancy and high availability principles |
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NEW QUESTION # 82
You want to gracefully take a device out of service to perform an OS upgrade. How would you accomplish this task using Juniper Apstra?
Answer: D
Explanation:
In Apstra 5.1, the correct operational method to gracefully remove a switch from service for maintenance is to set its Deploy Mode to Drain. Drain is a day-2 operational control that tells Apstra to adjust intent so the fabric can continue operating while the targeted device is logically taken out of service as much as the design allows. This is especially relevant in EVPN-VXLAN leaf-spine fabrics where taking down a spine or a leaf can disrupt underlay BGP adjacencies and overlay reachability if traffic is not shifted first.
This action is performed from the blueprint's Active view because Drain affects the currently deployed, running fabric state (not a staged design change). Selecting the device under Active and changing Deploy Mode to Drain initiates the workflow that prepares the device for maintenance by reducing its role in forwarding and/or withdrawing dependent services according to the blueprint's modeled redundancy (for example, shifting server-facing traffic to an MLAG/ESI peer where applicable, or reducing reliance on the device for transit). After the device is drained, an OS upgrade can be performed with less impact, and the device can later be returned to service by switching Deploy Mode back to Deploy and committing the change.
The "Upgrade" action is not the deploy-mode mechanism described for graceful removal; the key is Deploy Mode โ Drain from Active, which is explicitly intended for maintenance and decommissioning scenarios.
Verified Juniper sources (URLs):
https://www.juniper.net/documentation/us/en/software/apstra5.1/apstra-user-guide/topics/task/device-drain.html
https://www.juniper.net/documentation/us/en/software/apstra4.2/apstra-drain-mode/apstra-drain-mode-guide/topics/concept/apstra-drain-mode-activate-or-disable-drain.html
NEW QUESTION # 83
Which two components make up a Juniper Apstra Blueprint? (Choose two.)
Answer: A,B
Explanation:
A Blueprint in Juniper Apstra is built from a Template, which defines the logical fabric design, and requires managed devices to be assigned to the various roles (spine, leaf, access) defined by that template. Together, these form the active, deployable representation of the data center fabric that Apstra manages and monitors.
NEW QUESTION # 84
You want to assign resources to your blueprint during the deployment phase. In this scenario, which statement is correct?
Answer: B
Explanation:
In Apstra 5.1, "resources" (such as ASNs, IP addressing, and VNIs) are allocated to blueprint elements using resource pools. The blueprint does not require you to manually craft every individual resource value; instead, Apstra's workflow is to have you indicate which pool(s) should be used for the blueprint, and then Apstra automatically pulls and assigns the required values. This automation is fundamental to Apstra's intent-based model: once the blueprint knows which pools to consume, it can deterministically allocate unique values across the fabric and generate consistent Junos configuration for the assigned devices.
Option D best matches this behavior because it reflects the documented mechanism: required resources are automatically pulled from the selected pool(s) and assigned in a fast, bulk transaction. This is what enables repeatable deployments-especially in EVPN-VXLAN data center fabrics-because resource collisions and manual tracking are avoided.
Option A is not the defining prerequisite for resource assignment; device profile and device assignment are important overall build steps, but the correctness of resource assignment is tied to pool selection and availability rather than being strictly gated by those tasks. Option B is incorrect because pools can be created and managed beyond only "global" contexts, and Apstra also supports creating additional pools from within the blueprint when needed. Option C is misleading because resources are governed by pools and allocation, not only by manual creation under a single tab.
Verified Juniper sources (URLs):
https://www.juniper.net/documentation/us/en/software/apstra5.1/apstra-user-guide/topics/concept/resources.html
https://www.juniper.net/documentation/us/en/software/apstra5.1/apstra-user-guide/topics/concept/freeform-resource-management.html
https://www.juniper.net/documentation/us/en/software/apstra5.1/apstra-user-guide/topics/ref/resource-pools-api.html
NEW QUESTION # 85
In Juniper Apstra, what is the purpose of the "Build" tab within a blueprint?
Answer: D
Explanation:
The Build tab within a Juniper Apstra blueprint provides administrators with a view of staged configuration changes compared to the currently active state. From this tab, administrators can review the differences, validate the design, and commit the staged changes to make them active on the managed devices.
NEW QUESTION # 86
Exhibit.
Referring to the exhibit, how many broadcast domains will an Ethernet frame pass through when traversing the IP fabric from Server A to Server B?
Answer: A
Explanation:
Referring to the exhibit, the image shows a simplified diagram of an IP fabric network connecting two servers, labeled as Server A and Server B. The IP fabric is a network architecture that uses a Clos topology to provide high bandwidth, low latency, and scalability for data center networks. The IP fabric consists of spine and leaf devices that use BGP as the routing protocol and VXLAN as the overlay technology1.
A broadcast domain is a logical portion of a network where any device can directly transmit broadcast frames to other devices at the data link layer (OSI Layer 2). A broadcast frame is a frame that has a destination MAC address of all ones (FF:FF:FF:FF:FF:FF), which means that it is intended for all devices in the same broadcast domain. A broadcast domain is usually bounded by a router, which does not forward broadcast frames to other networks2.
In the exhibit, there are two broadcast domains that an Ethernet frame will pass through when traversing the IP fabric from Server A to Server B. The first broadcast domain is the one that contains Server A and the leaf device that it is connected to. The second broadcast domain is the one that contains Server B and the leaf device that it is connected to. The IP fabric itself is not a broadcast domain, because it uses IP routing and VXLAN encapsulation to transport the Ethernet frames over the Layer 3 network. Therefore, the statement C is correct in this scenario.
The following three statements are incorrect in this scenario:
A . 1. This is not true, because there are not one, but two broadcast domains that an Ethernet frame will pass through when traversing the IP fabric from Server A to Server B. The IP fabric itself is not a broadcast domain, because it uses IP routing and VXLAN encapsulation to transport the Ethernet frames over the Layer 3 network.
B . 4. This is not true, because there are not four, but two broadcast domains that an Ethernet frame will pass through when traversing the IP fabric from Server A to Server B. The spine devices and the leaf devices that are not connected to the servers are not part of the broadcast domains, because they use IP routing and VXLAN encapsulation to transport the Ethernet frames over the Layer 3 network.
D . 3. This is not true, because there are not three, but two broadcast domains that an Ethernet frame will pass through when traversing the IP fabric from Server A to Server B. The IP fabric itself is not a broadcast domain, because it uses IP routing and VXLAN encapsulation to transport the Ethernet frames over the Layer 3 network.
Reference:
IP Fabric Overview
Broadcast Domain - NetworkLessons.com
NEW QUESTION # 87
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