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Data Center, Specialist (JNCIS-DC) Free Sample Questions

Description

Covers IP fabric, EVPN and VXLAN data center architectures, Juniper Apstra architecture and design, build and deploy phases, managing deployed blueprints, multitenancy, and intent-based analytics.

12 free sample questions150 in the full practice test

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JN0-481 Sample Questions

  1. Question 1

    Advanced

    Data Center Architectures (IP Fabrics, EVPN-VXLAN) · EVPN route types and Edge-Routed Bridging

    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]

    Answer and explanation

    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.

  2. Question 2

    IntermediateMultiple answers

    Data Center Architectures (IP Fabrics, EVPN-VXLAN) · Underlay and overlay routing strategies

    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)

    Answer and explanation

    Correct answers: 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.

  3. Question 3

    Beginner

    Data Center Architectures (IP Fabrics, EVPN-VXLAN) · Virtual Network Identifier (VNI)-to-VLAN mapping

    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.

    Answer and explanation

    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.

  4. Question 4

    Intermediate

    Data Center Architectures (IP Fabrics, EVPN-VXLAN) · Route target versus vrf-import and vrf-export policies

    During the deployment of a multi-tenant EVPN-VXLAN fabric, a network engineer notices that routes from Tenant A are leaking into Tenant B's routing tables on a specific leaf switch. Which BGP construct is most likely misconfigured, causing the unintended sharing of routes between these isolated routing instances?

    Answer and explanation

    Correct answer: D

    The Route Target (RT) is an extended BGP community used to control the import and export of routes into specific VRFs (routing instances). If Tenant A's routes are appearing in Tenant B's VRF, it indicates that Tenant B's VRF import policy is incorrectly matching and importing Tenant A's Route Target.

  5. Question 5

    Beginner

    Data Center Architectures (IP Fabrics, EVPN-VXLAN) · Ethernet segments

    In an EVPN multi-homing scenario, what is the primary purpose of the Ethernet Segment Identifier (ESI)?

    Answer and explanation

    Correct answer: B

    The Ethernet Segment Identifier (ESI) is a 10-byte value used in EVPN to uniquely identify an Ethernet Segment, which is typically a connection from a multi-homed device (like a server using LACP) to two or more leaf switches. This enables active-active forwarding and prevents loops.

  6. Question 6

    Beginner

    Data Center Architectures (IP Fabrics, EVPN-VXLAN) · Virtual Tunnel Endpoint (VTEP) functions

    What is the primary function of a Virtual Tunnel Endpoint (VTEP) in a VXLAN architecture?

    Answer and explanation

    Correct answer: B

    A VTEP (Virtual Tunnel Endpoint) is responsible for originating and terminating VXLAN tunnels. It encapsulates original Layer 2 frames from connected hosts into VXLAN/UDP/IP packets for transport across the Layer 3 underlay network, and de-encapsulates them upon receipt.

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