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| Certification Vendor: | Juniper Networks |
|---|---|
| Exam Name: | Junos Data Center, Specialist (JNCIS-DC) |
| Exam Number: | JN0-481 |
| Exam Duration: | 90 minutes |
| Passing Score: | Approximately 60–70% |
| Related Certifications: | JNCIP-DC JNCIA-DC JNCIE-DC |
| Real Exam Qty: | Approximately 65 |
| Exam Price: | $300 USD (may vary by region) |
| Exam Format: | Scenario-based questions, Multiple-choice, Multiple-response |
| Certificate Validity Period: | 3 years |
| Available Languages: | English |
| Recommended Training: | EVPN-VXLAN Learning Resources Juniper Data Center Training Courses |
| Exam Registration: | Juniper Certification Portal Pearson VUE Juniper Exams |
| Sample Questions: | Juniper JN0-481 Sample Questions |
| Exam Way: | Online proctored or Pearson VUE test center |
| Pre Condition: | JNCIA-DC is recommended but not strictly required |
| Official Syllabus URL: | https://www.juniper.net/us/en/training/certification/certification-tracks/data-center.html |
JN0-481学習資料では、すべてのお客様が選択できる3つの異なるバージョンを設計しています。 3つの異なるバージョンには、PDFバージョン、ソフトウェアバージョン、オンラインバージョンが含まれ、お客様が質問を解決し、すべてのニーズを満たすのに役立ちます。 JN0-481学習資料の3つの異なるバージョンはすべてのお客様に同じデモを提供しますが、すべてのお客様の異なる固有のニーズを満たす特定の機能も備えています。 JN0-481学習教材のオンラインバージョンの最も重要な機能は実用性です。
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質問 # 44
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?
正解：B
解説：
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
質問 # 45
The servers attached to your Juniper Apstra managed data center fabric are running VMware.
You want to get the details about which VMs are attached to which leaf interface.
Referring to the exhibit, which statement is correct?
正解：B
解説：
In Juniper Apstra, to see details about which VMs are attached to which leaf interface, Apstra requires integration with the Virtual Infrastructure Manager (VIM), such as VMware vCenter for ESXi environments. Without defining and integrating a VIM, the VMs tab (as shown in the exhibit) will not display any data, even if servers are connected and running.
質問 # 46
What is the purpose of an EVPN Ethernet segment identifier (ESI)?
正解：C
解説：
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
質問 # 47
You have a virtual network that needs controlled access to other virtual networks in the same routing zone. Using the Juniper Apstra Ul. which feature would be used to accomplish this task?
正解：A
解説：
A security policy is the feature that would be used to accomplish the task of controlling access to other virtual networks in the same routing zone using the Juniper Apstra UI. A security policy allows you to define rules that specify which traffic is allowed or denied between different virtual networks, IP endpoints, or routing zones. A security policy can be applied to one or more virtual networks in the same routing zone, and it can use various criteria to match the traffic, such as source and destination IP addresses, protocols, ports, or tags. A security policy can also support DHCP relay, which enables the forwarding of DHCP requests from one virtual network to another.
質問 # 48
What are two agent processes that operate within the Juniper Apstra device agent? (Choose two.)
正解：B、D
解説：
Within the Juniper Apstra device agent, two of the key processes are:
- Telemetry agent, which collects operational and state data from the device and reports it back to the Apstra server.
- Deployment agent, which applies configuration changes delivered by Apstra to the device.
質問 # 49
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