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| Section | Objectives |
|---|---|
| Juniper Apstra Architecture | - Apstra Components
|
| Apstra Build and Deploy Phases | - Deployment Operations
|
| Apstra Design Phase | - Blueprint Design
|
| Data Center Multitenancy | - Tenant Services
|
| Intent-Based Analytics | - Analytics and Visibility
|
| Data Center Architectures | - IP Fabrics
|
| Blueprint Operations | - Day-2 Operations
|
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질문 # 45
In Juniper Apstra terminology, to which network operating system concept does a routing zone refer?
정답：D
설명：
In Apstra 5.1, a routing zone is the primary construct used to represent an L3 domain for multitenant isolation. In traditional network operating system terms, that maps to a VRF (Virtual Routing and Forwarding instance). Each routing zone is placed "in its own VRF," which provides independent routing tables and isolates IP traffic so that different tenants can reuse overlapping IP subnets without conflict. This is central to modern EVPN-VXLAN data center design, where tenants typically require clean separation of routing and policy boundaries.
Within a routing zone, you can create one or more virtual networks (often mapped to VXLAN segments) that provide L2 extension across racks while still being contained by the tenant's VRF. If L3 gateway services are enabled for those virtual networks, their gateway interfaces (for example, IRB interfaces on Junos v24.4 leaf switches) are associated with the routing zone's VRF so that inter-subnet routing occurs within the tenant boundary.
This terminology distinction is important: an IRB is an interface construct used to provide L3 gateway functionality for a VLAN/VXLAN segment; a VLAN is a Layer 2 segmentation mechanism; and an access list is a policy enforcement tool. A routing zone, however, defines the tenant's L3 routing context, which is precisely what a VRF provides on Junos.
Verified Juniper sources (URLs):
https://www.juniper.net/documentation/us/en/software/apstra5.0/apstra-user-guide/topics/concept/routing-zones.html
https://www.juniper.net/documentation/us/en/software/apstra4.2/apstra-user-guide/topics/concept/routing-zones.html
질문 # 46
You want to route between tenants in a multitenant environment in Juniper Apstr a. What are two ways to accomplish this task? (Choose two.)
정답：C,D
설명：
In Apstra 5.1 multitenancy, tenants are modeled as routing zones, and each routing zone maps to a distinct VRF to provide strict Layer 3 isolation. Because each tenant's VRF is separate, "routing between tenants" is effectively inter-VRF routing. Apstra's routing-zone behavior emphasizes that inter-tenant routing is achieved via external systems: you connect each tenant/routing zone to an external router or firewall (often attached to border leafs), and that external device performs the policy-controlled inter-VRF routing between tenants. This approach is the most common because it centralizes security and compliance controls (stateful inspection, zone policies, NAT, logging) on the firewall/router while keeping the fabric clean and consistent.
A second method is to perform inter-VRF routing on a VTEP-capable border leaf that terminates the tenant VRFs. In EVPN-VXLAN designs, border leafs are frequently the demarcation where tenant VRFs connect to outside domains; when the same border leaf hosts multiple tenant VRFs and is designed to provide L3 services for them, it can act as the routing point between VRFs (subject to your design and security requirements). Junos v24.4 supports VRFs and policy constructs required for controlled route exchange and forwarding behavior, but Apstra's intent model still expects routing-zone isolation by default-so any inter-tenant connectivity should be explicitly designed and governed, typically at the border.
질문 # 47
Which attribute enables Juniper Apstra to scale and manage thousands of devices with a single server instance?
정답：C
설명：
The attribute that enables Juniper Apstra to scale and manage thousands of devices with a single server instance is that Apstra is a distributed state system. This means that Apstra uses a graph database to store the network topology and configuration data in a distributed and replicated manner across multiple server nodes. This allows Apstra to handle large-scale networks with high performance, reliability, and availability. Apstra also uses a stateful orchestration engine that ensures the network state is always consistent with the intent of the blueprint, which is the logical representation of the network design and behavior. Apstra can automatically detect and resolve any discrepancies between the desired and actual network state, as well as handle any changes or failures in the network. The other options are incorrect because:
A . Apstra is installed as a cloud resource is wrong because Apstra can be installed either as a cloud resource or as an on-premises resource. Apstra is available as a virtual machine image that can be deployed on various hypervisors, such as VMware ESXi, QEMU/KVM, Microsoft Hyper-V, or Oracle VirtualBox. Apstra can also be deployed on public cloud platforms, such as Amazon Web Services (AWS) or Microsoft Azure. However, the installation method does not affect the scalability of Apstra, which is determined by the distributed state system architecture.
B . Apstra is based on NGINX is wrong because Apstra is not based on NGINX, but on Python and Django. NGINX is a web server and reverse proxy that Apstra uses to serve the web user interface and the REST API. However, NGINX is not the core component of Apstra, and it does not affect the scalability of Apstra, which is determined by the distributed state system architecture.
C . Apstra is available as an OVA is wrong because Apstra is available as an OVF, not an OVA. An OVF (Open Virtualization Format) is a standard format for packaging and distributing virtual machine images. An OVA (Open Virtual Appliance) is a single file that contains the OVF and the virtual disk images. Apstra provides an OVF file that can be imported into various hypervisors, such as VMware ESXi, QEMU/KVM, Microsoft Hyper-V, or Oracle VirtualBox. However, the availability of Apstra as an OVF does not affect the scalability of Apstra, which is determined by the distributed state system architecture. Reference:
JUNIPER APSTRA ARCHITECTURE
Apstra Server Requirements/Reference
Juniper Networks Apstra 4.0 enhances the experience of users and operators
질문 # 48
In Juniper Apstra, which statement about resources is correct?
정답：A
설명：
In Juniper Apstra, resource pools (such as IP pools, VLAN pools, and ASN pools) can have their scope defined as either global (available to all blueprints) or blueprint-specific (available only within a single blueprint). This flexibility allows for centralized resource management or isolated per-blueprint allocations.
질문 # 49
You are using Juniper Apstra to create logical devices and interface maps. You use them in three different rack types. You then modify the logical devices to support the required increased interface speeds and receive an error message when updating the logical devices.
Referring to the exhibit, which action is needed to remove the error?
정답：C
설명：
In Juniper Apstra, logical devices must remain semantically valid across all references (templates, racks, and interface maps). If you change interface speeds or roles, any existing references to that logical device can become inconsistent, leading to the validation error shown.
To resolve it, you must remove all dependencies - templates, racks, and interface maps - that reference the logical device, then recreate or update them with the modified logical device definition.
질문 # 50
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