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| Certification Vendor: | Juniper |
|---|---|
| Exam Name: | Data Center, Specialist (JNCIS-DC) |
| Exam Number: | JN0-481 |
| Exam Format: | Multiple Choice |
| Exam Price: | $300 USD |
| Certificate Validity Period: | 3 years |
| Real Exam Qty: | 65 |
| Exam Duration: | 90 minutes |
| Related Certifications: | JNCIA-DC JNCIS-DC |
| Available Languages: | English |
| Sample Questions: | Juniper JN0-481 Sample Questions |
| Exam Way: | Pearson VUE online or test center delivery |
| Pre Condition: | JNCIA-DC certification is required before taking the JN0-481 exam. |
| Official Syllabus URL: | https://www.juniper.net/gb/en/training/certification/tracks/data-center/jncis-dc.html |
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NEW QUESTION # 30
What does VXLAN use to uniquely label and identify broadcast domains?
Answer: B
Explanation:
VXLAN (Virtual Extensible LAN) uses a Virtual Network Identifier (VNI), a 24-bit field in the VXLAN header, to uniquely label and identify broadcast domains. Each VNI maps to a Layer 2 segment, allowing scalable network virtualization across Layer 3 infrastructures.
NEW QUESTION # 31
Which type of generic system should you select when adding a new server inside an existing rack type?
Answer: D
Explanation:
When adding a new server inside an existing rack type in Juniper Apstra, you should select a rack generic system. This type is used for devices (like servers or appliances) that are physically located within the rack and are part of the fabric's structured design, allowing consistent interface mapping and connectivity.
NEW QUESTION # 32
Referring to the exhibit,
what happens when an operator clicks the Accept Changes button on the right side of the screen in Juniper Apstra?
Answer: A
Explanation:
In Apstra 5.1, this screen represents a configuration deviation workflow: Apstra is comparing the intended (golden) configuration it generated from blueprint intent against the actual configuration currently on the device. When an operator makes a change directly on the switch CLI (for example, on a Junos v24.4 leaf), Apstra detects the difference and flags it as drift because it did not originate from the blueprint's intent model.
Clicking Accept Changes tells Apstra to adopt the device's current CLI state as the new accepted baseline for that device, effectively incorporating the observed CLI delta into Apstra's intended configuration for purposes of future comparison and compliance. In other words, Apstra stops treating that specific deviation as an error because it has been acknowledged and absorbed into the "golden config" (the intent-aligned configuration Apstra considers correct for that node). This is commonly used when an emergency change was made on-box and you want Apstra's source of truth to reflect it, rather than reverting it.
This differs from Apply Full Config, which is used to push Apstra's intended configuration down to the device to restore compliance. If you do not accept the change, a later commit/apply action can overwrite the CLI-entered configuration to re-align with blueprint intent.
NEW QUESTION # 33
Which two statements about ESI values are correct for the server connections to the fabric shown in the exhibit? (Choose two.)
Answer: A,C
Explanation:
To answer this question, we need to understand the concept of ESI values in EVPN LAGs. An ESI is a 10-byte value that identifies an Ethernet segment, which is a set of links that connect a multihomed device (such as a server) to one or more PE devices (such as leaf switches) in an EVPN network. The same ESI value must be configured on all the PE devices that connect to the same Ethernet segment. This allows the PE devices to form an EVPN LAG, which supports active-active or active-standby multihoming for the device. The ESI value can be manually configured (type 0) or automatically derived from LACP (type 1) or other methods. In the exhibit, Server A is connected to two leaf switches (QFX 5210) using a LAG with LACP enabled. Server B is connected to three leaf switches (QFX 5120) using a LAG with LACP enabled.
NEW QUESTION # 34
An operator is working on a capacity-planning exercise. The operator needs to examine the pre-built time-series information regarding link utilization. In the Juniper Apstra UI, which top-level tab would the operator have to access to find this information?
Answer: C
Explanation:
In Apstra 5.1, capacity planning based on pre-built time-series telemetry (such as link utilization trends) is part of Intent-Based Analytics (IBA). IBA is where Apstra ingests streaming telemetry from fabric devices, stores it as time-series data, and presents it through built-in analytics views (dashboards/widgets) and probes. Because the question specifically calls out "pre-built time series information regarding link utilization," the correct UI location is the Analytics top-level tab within the blueprint.
The Active tab is primarily oriented to operational state and day-2 workflows (for example, viewing live state, queries, and device-level operational views). The Staged tab is where you modify intent (physical/virtual design, policies, catalog items) prior to committing and deploying. The Dashboard provides a high-level blueprint overview and navigation, but the drill-down and time-series analytics views that support trending and capacity analysis are accessed via Analytics.
In an EVPN-VXLAN fabric using Junos v24.4, link utilization time-series is particularly valuable because underlay congestion can degrade overlay performance (BGP convergence behavior, ECMP distribution effectiveness, and endpoint experience). Apstra's Analytics tab centralizes these metrics so operators can evaluate utilization baselines, identify sustained hot links, and support proactive actions (rebalancing, adding capacity, or adjusting design intent) without relying on ad-hoc per-device CLI polling.
Verified Juniper sources (URLs):
https://www.juniper.net/documentation/us/en/software/apstra5.1/apstra-custom-telemetry-collection-guide/topics/concept/apstra-telemetry-and-intent-based-analytics.html
NEW QUESTION # 35
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