JPR-981 Sample Questions & Answers
Free JNCIE-DC practice questions with worked answers and explanations. See how the ExamJungle simulator prepares you — then jump into the full test.
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- Question 1Advanced
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?
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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.
- Question 2Beginner
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?
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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.
- Question 3Intermediate
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?
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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.
- Question 4IntermediateSelect 2
Class of Service (CoS) · Configure and troubleshoot CoS settings
Select TWO correct statements regarding the configuration of Class of Service (CoS) traffic classifiers on a Junos QFX series switch. (Select TWO)
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Correct answers: A, D
BA classifiers map incoming CoS values (like DSCP or 802.1p) to a forwarding class and loss priority. They are efficient and applied at the interface level, trusting the marking set by the upstream device.
Multifield classifiers (configured via firewall filters) provide granular classification based on various packet header fields (IP, Port, Protocol), not just the CoS bits. They are used when you cannot trust the incoming markings or need specific flow-based classification.
- Question 5Intermediate
Overlay · Enable routing between different Layer 3 tenants
An organization is deploying an EVPN-VXLAN fabric with IP-VRF routing (Type 5). They want to ensure that Tenant A and Tenant B, which are in separate VRFs, can communicate. The routing is performed on the Leaf switches. Which configuration concept is required to leak routes between the two VRFs?
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Correct answer: D
To enable inter-VRF communication (route leaking), you must export routes from the source VRF with a specific Route Target (RT) and configure the destination VRF to import routes carrying that same RT. This allows the VRF tables to populate with routes from other tenants.
- Question 6Beginner
Management · Create and use custom Apstra configlets
True or False: In a Juniper Apstra managed fabric, when you modify the Intent in the Staged Blueprint, the changes are immediately pushed to the physical devices without any further user action.
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Correct answer: B
False. Apstra uses a two-stage commit model. Changes are made in the 'Staged' Blueprint. The user must explicitly 'Commit' the changes to move them to the 'Active' Blueprint, at which point Apstra pushes the configuration to the devices.
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