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| Certification Vendor: | Juniper Networks |
|---|---|
| Exam Name: | Juniper Networks Certified Specialist - Data Center (JNCIS-DC) Exam |
| Exam Number: | JN0-481 |
| Exam Duration: | 90 minutes |
| Exam Format: | Multi-Response, Multiple Choice |
| Available Languages: | English |
| Related Certifications: | JNCIA-DC (Data Center, Associate) JNCIE-DC (Data Center, Expert) JNCIP-DC (Data Center, Professional) |
| Certificate Validity Period: | 3 years |
| Exam Price: | $150 USD |
| Passing Score: | 70% |
| Real Exam Qty: | 65 |
| Recommended Training: | Juniper Data Center Architectures Juniper Apstra Essentials |
| Exam Registration: | Pearson VUE Registration |
| Sample Questions: | Juniper JN0-481 Sample Questions |
| Exam Way: | Online proctored or Onsite at Pearson VUE test centers |
| Pre Condition: | Recommended: JNCIA-DC (Data Center, Associate) certification or equivalent knowledge |
| Official Syllabus URL: | https://www.juniper.net/training/certification/tracks/data-center/jncis-dc.html |
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NEW QUESTION # 56
What is the purpose of an EVPN Ethernet segment identifier (ESI)?
Answer: C
Explanation:
In EVPN multihoming, the Ethernet Segment Identifier (ESI) is the mandatory identifier used to represent a multihomed Ethernet segment-for example, a server or downstream switch that is dual-homed to two leaf devices using a single logical LAG/port-channel. By assigning the same ESI to the participating leaf-facing interfaces, the fabric recognizes those links as belonging to one Ethernet segment and can apply EVPN multihoming procedures consistently across the pair.
A key outcome of EVPN multihoming is loop prevention for multi-attached Layer 2 domains. EVPN uses the Ethernet segment concept (identified by the ESI) along with Designated Forwarder (DF) election to ensure that only the appropriate device forwards BUM (broadcast, unknown unicast, multicast) traffic toward the multihomed segment, avoiding duplicate forwarding and L2 loops. In addition, ESI-based multihoming supports resilient forwarding behavior during failures (for example, link or node loss) while maintaining correct advertisement and convergence in the EVPN control plane.
Therefore, among the provided options, the purpose that best matches how ESI is used operationally is to prevent loops within a LAG/multihomed connection, which is fundamental to EVPN-VXLAN data center designs on Junos v24.4 leaf devices and is also explicitly supported by Apstra when modeling ESI-based dual-homing.
Verified Juniper sources (URLs):
https://www.juniper.net/documentation/us/en/software/nce/evpn-lag-multihoming-guide/topics/concept/evpn-lag-guide-introduction.html
https://www.juniper.net/documentation/us/en/software/nce/evpn-lag-multihoming-guide/topics/task/evpn-lag-guide-esi-types-lacp.html
https://www.juniper.net/documentation/us/en/software/junos/evpn/topics/topic-map/evpn-mh-df-election.html
NEW QUESTION # 57
What are three valid resource types supported within Juniper Apstra? (Choose three.)
Answer: A,B,E
Explanation:
Juniper Apstra supports various resource types for managing and assigning infrastructure values across blueprints. Three valid resource types are:
- Integer Pools - Used for assigning numeric values like VLAN IDs.
- VNI Pools - Used to assign unique VXLAN Network Identifiers to virtual networks.
- ASN Pools - Used to assign Autonomous System Numbers for BGP sessions.
Routing zone pools and interface pools are not valid resource types in Apstra. Routing zones and interfaces are configured differently within the blueprint structure.
NEW QUESTION # 58
Referring to the exhibit, which role does Device A serve in an IP fabric?
Answer: C
Explanation:
Device A serves as a spine in an IP fabric. An IP fabric is a network architecture that uses a spine-leaf topology to provide high performance, scalability, and reliability for data center networks. A spine- leaf topology consists of two layers of devices: spine devices and leaf devices.
Spine devices are the core devices that interconnect all the leaf devices using equal-cost multipath (ECMP) routing. Leaf devices are the edge devices that connect to the servers, storage, or other network devices. In the exhibit, Device A is connected to four leaf devices using multiple links, which indicates that it is a spine device.
NEW QUESTION # 59
Which two statements are correct about a Juniper Apstra server? (Choose two.)
Answer: A,C
Explanation:
Apstra manages devices using IP connectivity over the management network, which is a Layer 3 relationship. Whether you are using on-box agents or off-box agents, the controller (or cluster) communicates with the fabric devices using IP reachability (for example, to exchange management traffic, retrieve discovery state, collect telemetry, and push configuration). This is why Layer 2 adjacency is not required between the Apstra server and the managed switches; the essential requirement is routable IP connectivity and appropriate access (credentials/agent connectivity) to the device management interfaces.
From a platform perspective, Apstra does not need a dedicated physical NIC per managed device. Instead, the server/VM requires connectivity to the management network through a single network adapter, and that interface can route to all managed devices. In a typical data center deployment, the Apstra controller VM sits on a management VLAN/subnet and reaches the entire fabric through routed management. This scales operationally: adding devices does not require adding additional server NICs; it only requires IP reachability and capacity planning for telemetry and agent workloads. Thus, the correct statements are that Apstra uses Layer 3 to communicate with managed devices and that it requires a single network adapter for that management connectivity model.
NEW QUESTION # 60
When creating a probe, an operator wants to make it easy to view that probe's output. In this scenario, which element must be created to accomplish this task?
Answer: A
Explanation:
In Apstra IBA, a probe is a directed graph made of stages (data you can inspect) and processors (operations that transform/aggregate data). While stages can be inspected during probe construction, the simplest operational way to make probe results readily consumable by day-2 operators is to publish them through widgets that can be placed on Analytics dashboards. A dashboard widget is the visualization and presentation object that renders either (1) counts of anomalies or (2) the outputs produced by stages and processors in a probe. Creating a widget tied to the probe output means the operator can open a dashboard and immediately see the metric trends, tables, or anomaly indicators without navigating into probe internals.
A predefined probe is optional content (a starting template) and is not required for visibility. Processors and stages are internal probe building blocks, but they do not, by themselves, create an operator-friendly view in the UI. In a Junos v24.4 EVPN-VXLAN fabric, this is especially useful for link utilization, drops, latency signals, or any custom telemetry pipeline: you build the probe logic once, then expose the key results in a widget that persists across operational workflows and can be shared on standardized dashboards for capacity planning and troubleshooting.
Verified Juniper sources (URLs):
https://www.juniper.net/documentation/us/en/software/apstra4.2/apstra-user-guide/topics/concept/widgets.html
https://www.juniper.net/documentation/us/en/software/apstra4.2/apstra-user-guide/topics/topic-map/widget-stage-create.html
https://www.juniper.net/documentation/us/en/software/apstra4.2/apstra-user-guide/topics/concept/probes.html
NEW QUESTION # 61
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