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JNCIE-DC Free Sample Questions

12 free sample questions135 in the full practice test

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JPR-981 Sample Questions

  1. Question 1

    Intermediate

    Layer 3 Underlay · Build, deploy, and troubleshoot an IP fabric

    A network architect is designing a new controllerless IP Fabric using EBGP for the underlay. To ensure proper load balancing across all spine links, the architect must configure the forwarding table export policy. Which specific action must be applied to the load-balancing policy to ensure per-flow load balancing is active across equal-cost paths?

    Answer and explanation

    Correct answer: D

    In Junos, to enable ECMP (Equal-Cost Multipath) load balancing, you must define a policy that sets the action 'load-balance per-flow' and apply this policy to the forwarding table via 'set routing-options forwarding-table export '. Without this, Junos installs only one next-hop in the forwarding table even if multiple routes exist in the routing table.

  2. Question 2

    Intermediate

    Management · Create and use custom Apstra configlets

    You are managing a Juniper Apstra environment and need to ensure that a specific configuration snippet for an NTP server is applied to all Leaf switches in a specific Blueprint. This configuration is not natively modeled by the Apstra reference design. Which mechanism should you use?

    Answer and explanation

    Correct answer: C

    Configlets in Juniper Apstra are small snippets of configuration text (CLI) used to deploy configurations that are not covered by the standard Reference Design (Blueprint). You create the Configlet in the Global Catalog and then import/apply it to the specific Blueprint and devices.

  3. Question 3

    Advanced

    Overlay · Establish communication between multihomed and single-homed end devices

    In an EVPN-VXLAN environment, you are configuring an ESI-LAG for a multi-homed server connected to two QFX switches. You want to ensure that if the link on one switch fails, traffic is rapidly switched to the other link without waiting for BGP protocol convergence. Which EVPN route type is primarily responsible for the 'Aliasing' function that enables load balancing to both switches even if one switch hasn't advertised specific MAC addresses yet?

    Answer and explanation

    Correct answer: B

    EVPN Type 1 routes (Ethernet Auto-Discovery) are used for Aliasing and Mass Withdrawal. The A-D per EVI route advertises the reachability of the ESI. Remote VTEPs use this to load balance traffic to all VTEPs sharing the same ESI, even if a specific MAC (Type 2) has only been learned/advertised by one of the PE devices, a feature known as Aliasing.

  4. Question 4

    Advanced

    Data Center Interconnect (DCI) · Deploy, manage, and troubleshoot a DCI solution

    You are troubleshooting a Data Center Interconnect (DCI) implementation where Seamless VXLAN stitching is used to connect two controllerless data centers. Tenants in DC1 cannot reach tenants in DC2. You verify that Type 5 routes are being exchanged. What is the most likely cause of the connectivity issue regarding the VXLAN encapsulation?

    Answer and explanation

    Correct answer: B

    In Seamless VXLAN stitching (interconnect gateway), the border leaf must decapsulate the VXLAN packet from the internal fabric and re-encapsulate it for the DCI tunnel. A critical step is rewriting the inner destination MAC address to match the Router MAC of the remote DCI gateway. If this rewrite does not happen or the Router MAC community is missing/incorrect, the remote gateway will drop the packet.

  5. Question 5

    Beginner

    Management · Enable subsecond link failure detection using Bidirectional Forwarding Detection (BFD)

    A network administrator needs to enable sub-second link failure detection between a Leaf switch and a connected server that does not support LACP. Which protocol should be configured on the interface to achieve this?

    Answer and explanation

    Correct answer: D

    BFD (Bidirectional Forwarding Detection) is a protocol designed to detect faults in the bidirectional path between two forwarding engines. It provides low-overhead, short-duration detection of failures in the path between adjacent forwarding engines, allowing for sub-second failure detection.

  6. Question 6

    Intermediate

    Management · Use tags and probes to track critical services

    In a Juniper Apstra managed environment, you notice a 'Route Anomaly' in the dashboard. Upon investigation, you see that a specific leaf switch is not advertising the expected loopback address to the spine. Which component of the Apstra software is responsible for continuously validating this network state against the Blueprint intent?

    Answer and explanation

    Correct answer: D

    Intent Based Analytics (IBA) in Apstra uses Probes to collect telemetry data and Processors to analyze that data. It continuously compares the real-time state of the network against the intended state defined in the Blueprint (the Intent). If a discrepancy is found (like a missing route), an Anomaly is raised.

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