FREE PDF 2025 JUNIPER JN0-281: TRUSTABLE REAL DATA CENTER, ASSOCIATE (JNCIA-DC) EXAM QUESTIONS

Free PDF 2025 Juniper JN0-281: Trustable Real Data Center, Associate (JNCIA-DC) Exam Questions

Free PDF 2025 Juniper JN0-281: Trustable Real Data Center, Associate (JNCIA-DC) Exam Questions

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Juniper JN0-281 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Layer 2 Switching and VLANs: This section of the exam measuresthe skills of a Network Support Engineer and covers the essential concepts of Layer 2 switching operations within Junos OS. It includes an overview of Ethernet switching and bridging, providing an understanding of how Layer 2 networks function. The section also introduces VLAN concepts, focusing on port modes, VLAN tagging methods, and the purpose of Integrated Routing and Bridging (IRB). It further explores the practical side by addressing how to configure, monitor, and troubleshoot both Layer 2 switching and VLANs.
Topic 2
  • Data Center Architectures: This section of the exam measures the skills of a Data Center Architect and covers foundational knowledge about various data center designs. It includes traditional multitier architectures as well as more modern IP fabric architectures using spine-leaf topologies. The section also touches on Layer 2 and Layer 3 strategies for forwarding traffic, the differences between overlay and underlay networks, and introduces Ethernet VPN–Virtual Extensible LAN (EVPN-VXLAN), explaining its basic purpose and role in data center environments.
Topic 3
  • Data Center Routing Protocols BGP
  • OSPF: This section of the exam measures skills of a Network Operations Specialist and covers the operation and key concepts of the OSPF protocol. It explains elements such as the link-state database, OSPF packet types, and router IDs, including how adjacencies and designated routers work within areas. The section then transitions to BGP, outlining its basic operations, message types, attributes, and the path selection process. It also discusses both IBGP and EBGP roles. Lastly, the section reviews how to configure, monitor, and troubleshoot OSPF and BGP using routing policies and various tools.
Topic 4
  • Protocol-Independent Routing: This section of the exam measures the skills of a Routing Engineer and covers routing features that function independently of any specific protocol. It includes static, aggregate, and generated routes, along with the concept of martian addresses. Routing instances and Routing Information Base (RIB) groups are introduced, as well as techniques like load balancing and filter-based forwarding. Configuration, monitoring, and troubleshooting aspects of these routing components are also covered in this section.
Topic 5
  • High Availability: This section of the exam measures the skills of a Data Center Reliability Engineer and covers strategies to ensure continuous network availability. It includes features like Link Aggregation Groups (LAG), Graceful Restart (GR), Bidirectional Forwarding Detection (BFD), and Virtual Chassis. It also provides a basic understanding of how to configure, monitor, and troubleshoot each of these high-availability components to maintain resilient network performance.

Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q46-Q51):

NEW QUESTION # 46
How can OSPF be configured to prefer one route over another?

  • A. By configuring route redistribution.
  • B. By setting a higher cost on the preferred route.
  • C. By setting a lower cost on the preferred route.
  • D. By adjusting interface bandwidth.

Answer: C


NEW QUESTION # 47
Which LSA types are associated with OSPF? (Choose three)

  • A. Network LSA (Type 2)
  • B. Router LSA (Type 1)
  • C. Summary LSA (Type 3)
  • D. External LSA (Type 5)

Answer: A,B,C


NEW QUESTION # 48
What happens if a frame with a known destination MAC address enters a switch?

  • A. The ingress PFE sends the header information to the RE.
  • B. The egress PFE performs a MAC address lookup and determines the ingress PFE and port.
  • C. The ingress PFE performs a MAC address lookup and determines the egress PFE and port.
  • D. The MAC address is added to the bridge table.

Answer: C


NEW QUESTION # 49
Which two statements are correct about rules for EBGP and IBGP? (Choose two.)

  • A. EBGP routes are more preferred than IBGP routes.
  • B. IBGP routes are more preferred than EBGP routes.
  • C. EBGP peers have a TTL of 1, while IBGP peers have a TTL of 255.
  • D. EBGP peers have a TTL of 255, while IBGP peers have a TTL of 1.

Answer: A,C

Explanation:
EBGP (External BGP) and IBGP (Internal BGP) operate with different rules due to the nature of their relationships.
Step-by-Step Breakdown:
TTL Differences:
EBGP: By default, EBGP peers have a TTL of 1, meaning they must be directly connected, or the TTL needs to be manually increased for multihop EBGP.
IBGP: IBGP peers within the same AS have a TTL of 255, as they are expected to communicate over multiple hops within the AS.
Preference for EBGP Routes:
Routes learned via EBGP are typically preferred over IBGP routes. This is because EBGP routes are considered more reliable since they originate outside the AS, while IBGP routes are internal.
Juniper Reference:
BGP Configuration: The different handling of TTL and route preferences between EBGP and IBGP ensures proper route selection and security within Junos-based networks.


NEW QUESTION # 50
Which signaling protocol is used for EVPN?

  • A. PIM
  • B. BGP
  • C. IS-IS
  • D. OSPF

Answer: B

Explanation:
EVPN (Ethernet Virtual Private Network) is a standard protocol used for building Layer 2 and Layer 3 VPNs over an IP or MPLS network. The signaling protocol used for EVPN is BGP (Border Gateway Protocol).
Step-by-Step Breakdown:
BGP as the EVPN Signaling Protocol:
EVPN uses BGP to exchange MAC address reachability information between routers (PE devices). This enables devices to learn which MAC addresses are reachable through which PE devices, facilitating Layer 2 forwarding across an IP or MPLS core.
BGP Extensions for EVPN:
BGP is extended with new address families (e.g., EVPN NLRI) to carry both MAC and IP address information, allowing for scalable and efficient multi-tenant network solutions.
Juniper Reference:
Junos EVPN Configuration: Juniper uses BGP as the control plane for EVPN to exchange MAC and IP route information between different data center devices.


NEW QUESTION # 51
......

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