JN0-481 Data Center, Specialist (JNCIS-DC) Practice Questions
Prepare for JN0-481 with more than an answer.
- Exam fee
- $300 USD
- Time limit
- 90 minutes
- Questions on the exam
- 65 multiple-choice questions
- Level
- Specialist
- Valid for
- 3 years
Domains covered on the exam 7
- Data Center Architectures (IP Fabrics, EVPN-VXLAN)15%
- Juniper Apstra Architecture14%
- Apstra Design Phase14%
- Apstra Build and Deploy Phases14%
- Blueprint Operations15%
- Data Center Multitenancy14%
- Intent-Based Analytics14%
- 1
When deploying Apstra 5.1 device agents, a system architect must choose between installing agents on-box or off-box. The environment consists of Juniper QFX switches and third-party switches that do not support installing third-party guest VMs or Python environments natively on the switch operating system. Which deployment method is required for the third-party switches?
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Correct answer: A
If a device's network operating system does not support hosting the Apstra agent locally (due to memory, CPU, or OS restrictions), the agent must be deployed 'off-box.' Off-box agents run as processes on the Apstra server itself or on a separate dedicated virtual machine, communicating with the device via APIs or SSH.
- 2
True or False: The Juniper Apstra user interface allows administrators to manage multiple, independent data center fabrics (blueprints) from a single Apstra server deployment.
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Correct answer: A
True. A single Apstra server can manage multiple blueprints. Each blueprint represents an independent, isolated data center fabric or pod, complete with its own intent, policies, and device assignments.
- 3
During the Apstra design phase, an engineer needs to define how a specific hardware model (e.g., QFX5120-48Y) maps its physical interfaces to the abstract port roles (like spine-facing or leaf-facing) defined in the fabric design. Which Apstra construct explicitly links the abstract port layout to the physical hardware capabilities?
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Correct answer: B
An Interface Map binds a Logical Device (the abstract requirement of ports, speeds, and roles) to a Device Profile (the physical hardware capabilities of a specific switch model). It instructs Apstra on exactly which physical ports to use for which logical roles.
- 4
A financial institution is designing a new multi-tenant data center fabric using Juniper QFX switches. They require optimal routing for intra-VLAN and inter-VLAN traffic. The architecture uses Edge-Routed Bridging (ERB) where the leaf switches act as anycast gateways. The network architect must decide whether to advertise host MAC and IP addresses using EVPN Route Type 2 or leverage EVPN Route Type 5 for subnet-based routing. Virtual machines within the same tenant frequently move between racks, and strict host-level routing is necessary to avoid suboptimal tromboning. Which EVPN route type and forwarding behavior optimally meets the requirement for host mobility and optimal inter-VLAN routing in this ERB architecture?
graph TD Spine1[Spine 1] --- Leaf1[Leaf 1] Spine1 --- Leaf2[Leaf 2] Spine2[Spine 2] --- Leaf1 Spine2 --- Leaf2 Leaf1 --- HostA[Host A - VLAN 10] Leaf2 --- HostB[Host B - VLAN 20]Show answer details
Correct answer: C
In an ERB design, EVPN Type 2 routes advertise both the MAC and IP address (as a /32 route) of a host. This allows leaf switches acting as anycast gateways to populate their ARP and routing tables, enabling symmetric Integrated Routing and Bridging (IRB). When a VM moves, a new Type 2 route is advertised, ensuring traffic is routed directly to the new leaf without tromboning.
- 5
A cloud service provider is standardizing their IP fabric underlay and overlay routing protocols. They are using Junos OS on QFX Series switches and following Juniper's recommended best practices for massively scalable data centers. Which TWO of the following routing strategies align with Juniper's best practices for the underlay and overlay networks? (Select TWO)
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Correct answer: C, D
Juniper's best practices for scalable IP fabrics recommend using eBGP for the underlay due to its robust policy control, scalability, and excellent Equal Cost Multi-Path (ECMP) support.
For the overlay, iBGP is typically used to carry EVPN routes, often with the spine switches acting as route reflectors to minimize the peering mesh between leaf switches.
- 6
True or False: In an EVPN-VXLAN architecture, a Virtual Network Identifier (VNI) must map 1:1 to the exact same VLAN ID number on every leaf switch across the entire fabric for the overlay to function properly.
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Correct answer: B
A key advantage of VXLAN is the decoupling of the overlay VNI from the local VLAN ID. Different leaf switches can map the same global VNI to different locally significant VLAN IDs based on their specific configuration and port requirements.
