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15. Frage
At which point in the design process does the operator choose IPv4 or IPv6 for a spine-and-leaf link underlay type?
Antwort: C
Begründung:
In Juniper Apstra, the choice of IPv4 or IPv6 for the spine-and-leaf underlay is made during blueprint creation. At this stage, the operator defines the fundamental design parameters of the fabric, including the underlay addressing type, which then determines how IP pools are allocated to inter-device links.
16. Frage
Exhibit.
Referring to the exhibit, which role does Device A serve in an IP fabric?
Antwort: A
Begründung:
Device A serves as a spine in an IP fabric. An IP fabric is a network architecture that uses a spine-leaf topology to provide high performance, scalability, and reliability for data center networks. A spine-leaf topology consists of two layers of devices: spine devices and leaf devices. Spine devices are the core devices that interconnect all the leaf devices using equal-cost multipath (ECMP) routing. Leaf devices are the edge devices that connect to the servers, storage, or other network devices. In the exhibit, Device A is connected to four leaf devices using multiple links, which indicates that it is a spine device. The other options are incorrect because:
A . leaf is wrong because a leaf device is an edge device that connects to the servers, storage, or other network devices. In the exhibit, Device A is not connected to any servers, storage, or other network devices, but only to four leaf devices, which indicates that it is not a leaf device.
C . super spine is wrong because a super spine device is a higher-level device that interconnects multiple spine devices in a large-scale IP fabric. A super spine device is typically used when the number of leaf devices exceeds the port density of a single spine device. In the exhibit, Device A is not connected to any other spine devices, but only to four leaf devices, which indicates that it is not a super spine device.
D . server is wrong because a server device is a compute or storage device that connects to a leaf device in an IP fabric. A server device is typically the end host that provides or consumes data in the network. In the exhibit, Device A is not connected to any leaf devices, but only to four leaf devices, which indicates that it is not a server device. Reference:
IP Fabric Underlay Network Design and Implementation
IP Fabric Overview
IP Fabric Architecture
17. Frage
Which Root Cause Identifier is currently supported in Juniper Apstra software?
Antwort: B
Begründung:
In Juniper Apstra 5.1, Root Cause Identification (RCI) is implemented with a currently supported model focused on connectivity. Practically, this means RCI is designed to take telemetry and state learned from the fabric (for example, interface operational status, LLDP neighbor information, and routing session status) and correlate those signals to determine the most likely underlying cause of a connectivity-impacting event. Within an EVPN-VXLAN IP fabric, many operational symptoms can appear similar at the service layer (endpoints cannot reach each other, routes disappear, overlays degrade), but RCI narrows the problem by correlating evidence across the underlay and control plane.
The "connectivity" RCI model targets common failure scenarios that directly break device-to-device reachability, such as a broken link, a miscabled link (wrong LLDP neighbors), or an operator-disabled interface. These conditions often cascade into higher-level symptoms, including BGP sessions dropping over affected links. With Junos v24.4-based leaf-spine fabrics, maintaining stable underlay connectivity is foundational for EVPN signaling and VXLAN forwarding; therefore, Apstra's connectivity-focused RCI helps operators rapidly isolate whether the primary fault lies in physical adjacency, cabling/neighbor correctness, or administrative shutdown-reducing mean time to repair by pointing to the most probable root cause rather than only listing alarms.
18. Frage
You have designed your fabric in Juniper Apstra prior to deploying the network devices. Which Apstra element in the Staged tab would be used to assist the team that is installing and cabling the devices?
Antwort: B
Begründung:
The Links table in the Staged tab shows the physical connections between the devices in the fabric. It provides information such as the source and destination device names, hostnames, serial numbers, roles, interfaces, and link status. The Links table can be used to assist the team that is installing and cabling the devices by verifying that the devices are connected correctly and that the links are operational. The Links table can also be used to troubleshoot any connectivity issues that may arise during the installation process.
19. Frage
In a three-stage Clos network, what are important key design aspects of a data center fabric? (Choose two.)
Antwort: A,C
Begründung:
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
20. Frage
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