Free JN0-280: Data Center Associate (JNCIA-DC) Exam Questions and Answers
Data Center Associate (JNCIA-DC) is exam JN0-280, part of the Juniper Networks Certification Program. Juniper's written exams share one format across every track and level: 65 multiple-choice questions in 90 minutes, delivered by Pearson VUE. The JN0- code carries the track in its second digit — 3 is security, 4 enterprise routing and switching, 5 Mist AI, 6 service provider, 8 data centre — and the level in the first, running Associate, Specialist, Professional and Expert.
Looking for JN0-280 exam dumps or ExamTopics JN0-280 questions? These JN0-280 practice questions cover the same ground with verified answers and explanations, a downloadable JN0-280 PDF and a full JN0-280 practice test, kept current as Juniper updates the exam.
Last updated: October 28, 2026
- Exam code
- JN0-280
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- Juniper
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- 1000+
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- First 10, with answers
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- 130 mins · 70%
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Question #1
Which Junos OS command assigns 802.1Q VLAN ID 20 to a VLAN named sales?
Correct answer: D
Explanation
The vlan-id statement under the [edit vlans] hierarchy binds the 802.1Q tag value to a named VLAN. The l3-interface statement only associates an IRB interface with the VLAN, and native-vlan-id applies to untagged traffic on a physical interface rather than defining the VLAN itself.
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Question #2
Which Junos OS routing instance type requires a route distinguisher and route target configuration?
Correct answer: B
Explanation
The vrf instance type is used for Layer 3 VPNs and requires a route distinguisher and route target (or vrf-target) so routes can be exchanged through MP-BGP. A virtual-router instance has its own routing tables but needs neither, and a forwarding instance is used for filter-based forwarding.
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Question #3
A data center uses a traditional multitier design with access, aggregation, and core layers. Servers in rack 1 and rack 7 are in the same VLAN but connect to different access switches. In this scenario, which two statements are correct? (Choose two.)
Select 2 answers.
Correct answer: C, D
Explanation
In a multitier design, access switches uplink to the aggregation layer, so east-west traffic between racks passes through it. Because the redundant Layer 2 paths form loops, spanning tree blocks some links. Direct access-to-core connections and added spine switches describe an IP fabric, not a multitier design.
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Question #4
A company runs a Layer 3 IP fabric underlay. The application team needs virtual machines to move between racks while keeping the same IP address and subnet. Which technology should you implement?
Correct answer: C
Explanation
EVPN-VXLAN builds a Layer 2 overlay on top of the Layer 3 underlay, so a subnet can stretch across racks without extending spanning tree. The other options change underlay routing or reintroduce Layer 2 loop control, and none of them stretches a subnet across a routed fabric.
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Question #5
Refer to the exhibit. user@router# show routing-options interface-routes { rib-group inet RG-1; } rib-groups { RG-1 { import-rib [ inet.0 DMZ.inet.0 ]; } } Which statement describes the result of this configuration?
Correct answer: D
Explanation
The interface-routes rib-group statement applies RG-1 to direct and local interface routes. The first table in import-rib (inet.0) is the primary table, and the routes are also copied into DMZ.inet.0. A RIB group applied under interface-routes does not affect static routes.
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Question #6
You are designing a three-stage IP fabric with 4 spine devices and 12 leaf devices. Every leaf device connects to every spine device with one link. How many spine-to-leaf links are required?
Correct answer: C
Explanation
Each of the 12 leaf devices has one link to each of the 4 spine devices, so the fabric needs 12 x 4 = 48 links. Adding the device counts (16) is a common error, and doubling the result (96) counts each bidirectional link twice.
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Question #7
Refer to the exhibit. user@switch> show configuration interfaces { xe-0/0/10 { native-vlan-id 100; unit 0 { family ethernet-switching { interface-mode trunk; vlan { members [ v100 v200 ]; } } } } } vlans { v100 { vlan-id 100; } v200 { vlan-id 200; } } An untagged Ethernet frame arrives on interface xe-0/0/10. What happens to the frame?
Correct answer: D
Explanation
The native-vlan-id statement tells the trunk port which VLAN to associate with untagged frames, and v100 uses VLAN ID 100 and is a member of the trunk. The order of the members list does not matter, and trunk ports can accept untagged traffic when a native VLAN is configured.
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Question #8
Refer to the exhibit. user@R1# show protocols ospf export static-to-ospf; area 0.0.0.10 { nssa; interface ge-0/0/0.0; } R1 is in area 10 and has an export policy that advertises static routes into OSPF. R2 is an ABR connecting area 10 to area 0. R3 is an internal router in area 0. Which LSA type for the static routes of R1 will be in the link-state database of R3?
Correct answer: D
Explanation
R1 originates the static routes as Type 7 LSAs, which exist only inside the NSSA. R2, as the ABR, translates them into Type 5 external LSAs and floods them into area 0 with itself as the advertising router. No Type 4 LSA is needed because the translating ABR is the ASBR as far as area 0 is concerned.
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Question #9
Which two commands display the OSPF link-state database and the state of OSPF neighbors? (Choose two.)
Select 2 answers.
Correct answer: A, C
Explanation
The show ospf database command lists the LSAs held in the link-state database, and show ospf neighbor shows each neighbor with its adjacency state. The io-statistics output counts packets and the log output records SPF calculations, so neither shows the database or neighbor states.
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Question #10
Which UDP destination port number is used for VXLAN-encapsulated traffic?
Correct answer: D
Explanation
VXLAN encapsulates Layer 2 frames in UDP, and the IANA-assigned destination port is 4789. Port 179 is BGP over TCP, 646 is LDP, and 3784 is single-hop BFD.
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Discussion
Explain your reasoning, not just the letterOther Juniper certifications
- JN0-104: Junos, Associate (JNCIA-Junos) (opens in a new tab)
- JN0-105: Junos, Associate (JNCIA-Junos) (opens in a new tab)
- JN0-363: Service Provider Routing and Switching, Specialist (JNCIS-SP) (opens in a new tab)
- JN0-351: Enterprise Routing and Switching, Specialist (JNCIS-ENT) (opens in a new tab)
- JN0-230: Security, Associate (JNCIA-SEC) (opens in a new tab)
- JN0-347: Enterprise Routing and Switching, Specialist (JNCIS-ENT) (opens in a new tab)
- JN0-231: Security, Associate (JNCIA-SEC) (opens in a new tab)
- JN0-634: Security Professional (JNCIP-SEC) (opens in a new tab)
- JN0-1101: Juniper Networks Certified Design Associate (JNCDA) (opens in a new tab)
- JN0-349: Enterprise Routing and Switching, Specialist (JNCIS-ENT) (opens in a new tab)
- JN0-360: Juniper Networks Certified Internet Specialist SP (JNCIS-SP) (opens in a new tab)
- JN0-664: Service Provider Routing and Switching, Professional (JNCIP-SP) (opens in a new tab)
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FAQ
Learn More: https://www.juniper.net/us/en/training/certification.html
- Q1: What is the JN0-280: Data Center Associate (JNCIA-DC) exam?
- A: JN0-280: Data Center Associate (JNCIA-DC) is a Juniper certification exam. Judging by the questions in our bank, it concentrates on referring, OSPF, routes, IBGP and fabric.
- Q2: What topics does the JN0-280: Data Center Associate (JNCIA-DC) exam cover?
- A: Questions in our JN0-280: Data Center Associate (JNCIA-DC) bank cluster around referring, OSPF, routes, IBGP, fabric, routing and received. Working through the full set is the quickest way to find which of these you are weakest on.
- Q3: How should I prepare for JN0-280: Data Center Associate (JNCIA-DC)?
- A: Work through the JN0-280: Data Center Associate (JNCIA-DC) practice questions here, checking your answer on each one, then sit the practice test to rehearse the exam under timed conditions before the real thing.
- Q4: Are these real JN0-280: Data Center Associate (JNCIA-DC) exam questions?
- A: They are drawn from officially released past questions and from community members who have sat JN0-280: Data Center Associate (JNCIA-DC). Answers are verified and updated weekly.
- Q5: Where do I register for the JN0-280: Data Center Associate (JNCIA-DC) exam?
- A: Register through Juniper directly. Exampractice is not affiliated with Juniper and does not administer the exam.
- Q6: Is there a free JN0-280: Data Center Associate (JNCIA-DC) sample?
- A: Yes. Every JN0-280: Data Center Associate (JNCIA-DC) page shows a free sample of real questions. Upgrading opens the full bank and the practice test.
- Q7: What are Juniper Certification Exams?
- A: Juniper Certification Exams validate your expertise in using and managing Juniper Networks’ products and solutions, including routing, switching, security, and automation. These certifications demonstrate your proficiency in deploying, configuring, and troubleshooting Juniper technologies to optimize network performance and security.
- Q8: Why should I pursue Juniper Certification?
- A: Juniper Certification enhances your professional credibility, showcasing your skills and knowledge in networking and security. This can lead to better job opportunities, higher salaries, and career advancement in IT, networking, and cybersecurity roles.
- Q9: What are the benefits of Juniper Certification?
- A: Benefits include recognition as a certified Juniper professional, improved job performance, access to exclusive resources, continuing education opportunities, and staying current with the latest Juniper technologies and best practices.
- Q10: Who should take Juniper Certification Exams?
- A: Network engineers, system administrators, security professionals, and anyone involved in managing and implementing Juniper Networks’ solutions should consider these certifications to validate their expertise and advance their careers.
- Q11: What types of Juniper Certification Exams are available?
- A: Juniper offers various certification paths, including:
- Q12: How do I prepare for Juniper Certification Exams?
- A: Preparation can include official Juniper training courses, study guides, practice exams, online tutorials, and hands-on experience with Juniper products and solutions.
- Q13: Where can I take Juniper Certification Exams?
- A: Juniper Certification Exams can be taken at authorized Pearson VUE testing centers worldwide or online, providing flexibility to fit your schedule and location.
- Q14: How do Juniper Certifications impact my career?
- A: Juniper Certifications significantly boost your career by demonstrating your expertise to employers, making you a more competitive candidate for advanced roles and promotions in networking, security, and IT infrastructure.
- Q15: Are there any prerequisites for Juniper Certification Exams?
- A: Some exams may have prerequisites, such as foundational knowledge or prior experience with Juniper products. Check the specific requirements for each certification path on the Juniper Networks Certification Program (JNCP) website.
- Q16: How often do I need to recertify for Juniper Certifications?
- A: Juniper Certifications typically require recertification every three years to ensure that certified professionals stay updated with the latest networking technologies and industry practices.