TrainingDumps Juniper JN0-281 Dumps (2025)

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Juniper JN0-281 Exam Syllabus Topics:

Topic	Details
Topic 1	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 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	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.
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	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.

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q131-Q136):

NEW QUESTION # 131
By default, which two statements are correct about BGP advertisements? (Choose two.)

A. BGP peers advertise routes received from EBGP peers to other IBGP peers.
B. BGP peers advertise routes from IBGP peers to EBGP peers using its own address as the next hop.
C. BGP peers advertise routes received from IBGP peers to other IBGP peers.
D. BGP peers advertise routes from EBGP peers to other IBGP peers using its own address as the next hop.

Answer: A,B

Explanation:
BGP (Border Gateway Protocol) has specific rules for route advertisement between peers.
Step-by-Step Breakdown:
EBGP to IBGP Route Propagation:
BGP peers advertise routes learned from EBGP peers to IBGP peers within the same AS. This ensures that routes learned from external networks are propagated internally within the AS. IBGP to EBGP Route Propagation:
Routes learned from IBGP peers can be advertised to EBGP peers, but when advertising these routes, the router uses its own IP address as the next hop.
IBGP Split Horizon:
By default, IBGP peers do not advertise routes learned from one IBGP peer to another IBGP peer.
This rule (IBGP split horizon) prevents routing loops within an AS.
Juniper
Reference: BGP Advertisement Rules: Junos adheres to BGP standards, where IBGP peers do not propagate routes to other IBGP peers, but EBGP peers receive IBGP routes with the advertising router as the next hop.

NEW QUESTION # 132
Which two statements describe an IP fabric? (Choose two.)

A. An IP fabric depends on Layer 2 switching.
B. An IP fabric uses spine and leaf devices.
C. An IP fabric allows devices to always be one hop away.
D. An IP fabric provides traffic load sharing.

Answer: B,D

Explanation:
An IP fabric is a network topology designed to provide a scalable, low-latency architecture that is typically implemented in modern data centers. It uses spine and leaf switches and enables efficient traffic load sharing across the network.
Step-by-Step Breakdown:
Spine-Leaf Architecture:
Leaf Devices: These switches connect to servers and edge devices within the data center. Each leaf switch connects to every spine switch.
Spine Devices: These high-performance switches interconnect all the leaf switches. There are no direct connections between leaf switches or spine switches. This architecture ensures that any two endpoints within the fabric are only one hop away from each other, minimizing latency.
Traffic Load Sharing:
An IP fabric leverages Equal-Cost Multipath (ECMP) to distribute traffic evenly across all available paths between leaf and spine switches, providing effective load balancing. This ensures that no single link becomes a bottleneck and that traffic is distributed efficiently across the network.
Juniper Reference:
Juniper provides QFX Series switches optimized for IP fabric topologies, allowing for scalable deployments in modern data centers.
EVPN-VXLAN: Often used in IP fabrics to extend Layer 2 services across the fabric with Layer 3 underlay, enabling both efficient routing and bridging.

NEW QUESTION # 133
Layer 2 interfaces operate in which two modes? (Choose two.)

A. Modular
B. Access
C. Trunk
D. Tagged

Answer: B,C

Explanation:
Comprehensive Detailed Step by Step Explanation with all Juniper Data Center References Layer 2 interfaces on a switch operate in two key modes: Access and Trunk.
Step-by-Step Breakdown:
Access Mode:
Access ports are used to connect end devices, like PCs or servers, and they are assigned to a single VLAN. These interfaces handle untagged traffic and do not pass VLAN tags.
Example: A port assigned to VLAN 10 will only handle traffic for that VLAN.
Trunk Mode:
Trunk ports are used to connect switches or other networking devices that need to handle traffic from multiple VLANs. Trunk interfaces carry tagged traffic, allowing multiple VLANs to traverse the same physical link.
Trunk ports typically use 802.1Q VLAN tagging to differentiate between VLANs.
Juniper Reference:
Access and Trunk Ports: Juniper switches use these modes to manage VLAN traffic at Layer 2, with access ports handling untagged traffic and trunk ports handling tagged traffic from multiple VLANs.

NEW QUESTION # 134
Which statement is correct about an IRB interface?

A. An IRB interface is a physical Layer 3 interface that connects VLANs together.
B. An IRB interface switches traffic within the same VLAN.
C. An IRB interface is a Layer 3 interface that can be used to route between VLANs.
D. An IRB interface trunks together VLANs on different switches.

Answer: C

Explanation:
An IRB (Integrated Routing and Bridging) interface provides routing functionality between VLANs at Layer 3, allowing devices in different VLANs to communicate with each other.
Step-by-Step Breakdown:
IRB Functionality:
The IRB interface enables routing between different VLANs by acting as a Layer 3 gateway. Traffic within the same VLAN is handled by Layer 2 switching, while traffic between VLANs is routed through the IRB interface.
Layer 3 Routing Between VLANs:
Each VLAN can be assigned an IP address on the IRB interface, which allows traffic to flow between VLANs based on Layer 3 IP routing.
Juniper Reference:
IRB Interface Configuration: Juniper supports IRB for inter-VLAN routing on devices like the EX and QFX series switches, facilitating Layer 3 communication in data centers.

NEW QUESTION # 135
In the context of protocol-independent routing, what is the main difference between static and generated routes?

A. Generated routes are manually configured, while static routes are automatically created.
B. Static routes require manual configuration, while generated routes are created dynamically.
C. Generated routes support summarization, while static routes do not.
D. Static routes are used for load balancing, while generated routes are not.

Answer: B

NEW QUESTION # 136
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