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| Certification Vendor: | Juniper |
|---|---|
| Exam Name: | Data Center, Specialist (JNCIS-DC) |
| Exam Number: | JN0-481 |
| Exam Duration: | 90 minutes |
| Real Exam Qty: | 65 |
| Exam Format: | Multiple Choice |
| Exam Price: | $300 USD |
| Related Certifications: | JNCIS-DC JNCIA-DC |
| Certificate Validity Period: | 3 years |
| 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 # 38
In a three-stage Clos network, what are important key design aspects of a data center fabric? (Choose two.)
Answer: C,D
Explanation:
A three-stage Clos (leaf-spine) data center fabric separates roles to keep forwarding predictable and scalable. The leaf layer is the attachment point for endpoints, so servers connect to leaf devices. This is where the fabric accepts workload traffic, applies edge policies, and provides tenant/service constructs (for EVPN-VXLAN fabrics, the leafs typically act as VTEPs and host IRB gateways as required). The spine layer provides the non-blocking transit core between leafs using L3 underlay routing and ECMP, but it is not the place where servers attach directly.
For north-south connectivity, a typical three-stage Apstra data center architecture includes border leaf switches. These border devices provide the controlled connection point between the fabric and external networks (Internet/WAN/DCI or upstream services). As a result, fabric traffic enters and exits the border devices, not the spines. This design keeps the spines dedicated to high-speed east-west transit and simplifies operations: external routing policies, security controls, and inter-domain handoffs are concentrated at the border, while the spines remain a uniform L3 transit tier. In Junos v24.4 EVPN-VXLAN deployments, this separation also helps maintain clean overlay boundaries and consistent underlay behavior across the fabric.
Verified Juniper sources (URLs):
https://www.juniper.net/documentation/us/en/software/juniper-data-center-assurance/user-guide/topics/concept/dc-network-topology-on-dc-assurance.html
https://www.juniper.net/documentation/us/en/software/jvd/jvd-3-stage-datacenterdesign-with-juniper-apstra/solution_architecture.html
https://www.juniper.net/content/dam/www/assets/white-papers/us/en/design-considerations-for-spine-and-leaf-ip-fabrics.pdf
NEW QUESTION # 39
In Juniper Apstra, which statement best describes the difference between a Logical Device and an Interface Map?
Answer: C
Explanation:
A Logical Device in Juniper Apstra defines an abstract representation of a device's ports, including roles and speeds, independent of any specific hardware. An Interface Map then binds this abstract Logical Device definition to the actual physical interfaces of a real hardware platform, allowing the same logical design to be deployed on different physical device models.
NEW QUESTION # 40
In the Juniper Apstra design phase, which object dictates port count, port speed, and how the ports would be used?
Answer: C
Explanation:
Interface maps are objects that map interfaces between logical devices and physical hardware devices in the Juniper Apstra design phase. They dictate port count, port speed, and how the ports would be used for achieving the intended network configuration rendering. Interface maps also allow you to select device ports, transformations, and interfaces, provision breakout ports, and disable unused ports.
NEW QUESTION # 41
Exhibit.
Referring to the exhibit, how many broadcast domains will an Ethernet frame pass through when traversing the IP fabric from Server A to Server B?
Answer: A
Explanation:
Referring to the exhibit, the image shows a simplified diagram of an IP fabric network connecting two servers, labeled as Server A and Server B. The IP fabric is a network architecture that uses a Clos topology to provide high bandwidth, low latency, and scalability for data center networks. The IP fabric consists of spine and leaf devices that use BGP as the routing protocol and VXLAN as the overlay technology1.
A broadcast domain is a logical portion of a network where any device can directly transmit broadcast frames to other devices at the data link layer (OSI Layer 2). A broadcast frame is a frame that has a destination MAC address of all ones (FF:FF:FF:FF:FF:FF), which means that it is intended for all devices in the same broadcast domain. A broadcast domain is usually bounded by a router, which does not forward broadcast frames to other networks2.
In the exhibit, there are two broadcast domains that an Ethernet frame will pass through when traversing the IP fabric from Server A to Server B. The first broadcast domain is the one that contains Server A and the leaf device that it is connected to. The second broadcast domain is the one that contains Server B and the leaf device that it is connected to. The IP fabric itself is not a broadcast domain, because it uses IP routing and VXLAN encapsulation to transport the Ethernet frames over the Layer 3 network. Therefore, the statement C is correct in this scenario.
The following three statements are incorrect in this scenario:
A . 1. This is not true, because there are not one, but two broadcast domains that an Ethernet frame will pass through when traversing the IP fabric from Server A to Server B. The IP fabric itself is not a broadcast domain, because it uses IP routing and VXLAN encapsulation to transport the Ethernet frames over the Layer 3 network.
B . 4. This is not true, because there are not four, but two broadcast domains that an Ethernet frame will pass through when traversing the IP fabric from Server A to Server B. The spine devices and the leaf devices that are not connected to the servers are not part of the broadcast domains, because they use IP routing and VXLAN encapsulation to transport the Ethernet frames over the Layer 3 network.
D . 3. This is not true, because there are not three, but two broadcast domains that an Ethernet frame will pass through when traversing the IP fabric from Server A to Server B. The IP fabric itself is not a broadcast domain, because it uses IP routing and VXLAN encapsulation to transport the Ethernet frames over the Layer 3 network.
Reference:
IP Fabric Overview
Broadcast Domain - NetworkLessons.com
NEW QUESTION # 42
What is correct about the selected device shown in the exhibit?
Answer: A
Explanation:
In the exhibit, the selected node node100 is labeled as a Generic System. In Juniper Apstra, a generic system represents an external device (such as a server, firewall, or third-party system) that connects to the fabric but is not managed as part of the internal fabric infrastructure.
Therefore, it is an external generic system.
NEW QUESTION # 43
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