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[General] JN0-281 Exam Resources & JN0-281 Actual Questions & JN0-281 Exam Guide

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【General】 JN0-281 Exam Resources & JN0-281 Actual Questions & JN0-281 Exam Guide

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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
  • 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 3
  • 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 4
  • 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 5
  • 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.

Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q68-Q73):NEW QUESTION # 68
What is the primary purpose of an IRB Layer 3 interface?
  • A. to provide port security
  • B. to provide load balancing
  • C. to provide a default VLAN ID
  • D. to provide inter-VLAN routing
Answer: D
Explanation:
The primary purpose of an IRB (Integrated Routing and Bridging) interface is to enable inter-VLAN routing in a Layer 3 environment. An IRB interface in Junos combines the functionality of both Layer 2 bridging (switching) and Layer 3 routing, allowing devices in different VLANs to communicate with each other.
Step-by-Step Breakdown:
VLANs and Layer 2 Switching:
Devices within the same VLAN can communicate directly through Layer 2 switching. However, communication between devices in different VLANs requires Layer 3 routing.
IRB Interface for Inter-VLAN Routing:
The IRB interface provides a Layer 3 gateway for each VLAN, enabling routing between VLANs. Without an IRB interface, devices in different VLANs would not be able to communicate.
Configuration:
In Juniper devices, the IRB interface is configured by assigning Layer 3 IP addresses to it. These IP addresses serve as the default gateway for devices in different VLANs. Example configuration:
set interfaces irb unit 0 family inet address 192.168.1.1/24 set vlans vlan-10 l3-interface irb.0 This allows VLAN 10 to use the IRB interface for routing.
Juniper
Reference: IRB Use Case: Inter-VLAN routing is essential in data centers where multiple VLANs are deployed, and Juniper's EX and QFX series switches support IRB configurations for this purpose.

NEW QUESTION # 69
During a BGP Graceful Restart, what happens to the routes learned from the restarting neighbor?
  • A. They are immediately removed from the routing table.
  • B. They are advertised to other BGP neighbors.
  • C. Their metric is increased to prevent their use.
  • D. They are marked as stale but kept in the routing table.
Answer: D

NEW QUESTION # 70
What is the primary purpose of using static routes in a network?
  • A. To provide a manually configured routing entry
  • B. To generate routing entries dynamically
  • C. To aggregate multiple routes into one
  • D. To automatically adjust routes based on network traffic
Answer: A

NEW QUESTION # 71
You want to minimize topology disruptions in your network when the rpd process restarts on a device.
Which service would accomplish this task?
  • A. Virtual Chassis
  • B. graceful restart (GR)
  • C. link aggregation groups
  • D. Bidirectional Forwarding Detection (BFD)
Answer: B
Explanation:
Graceful Restart (GR) is a feature that allows a router to maintain forwarding even when the routing process (e.g., the rpd process in Junos) is restarting, minimizing disruption to the network.
Step-by-Step Breakdown:
Graceful Restart Function:
During a GR event, the forwarding plane continues to forward packets based on existing routes, while the control plane (rpd process) is restarting. This prevents traffic loss and maintains routing stability. Minimizing Disruptions:
GR is particularly useful in ensuring continuous packet forwarding during software upgrades or routing protocol process restarts.
Juniper
Reference: Graceful Restart in Junos: GR ensures high availability by maintaining forwarding continuity during control plane restarts, enhancing network reliability.

NEW QUESTION # 72
What are two requirements for an IP fabric? (Choose two.)
  • A. a Layer 3 routing protocol
  • B. a single connection between each leaf
  • C. a single connection between each spine and leaf
  • D. a Layer 2 switching protocol
Answer: A,C
Explanation:
An IP fabric is a network architecture commonly used in data centers to provide scalable, high-throughput connectivity using a spine-leaf topology.
Step-by-Step Breakdown:
Layer 3 Routing Protocol:
An IP fabric relies on a Layer 3 routing protocol, typically BGP or OSPF, to provide routing between the leaf and spine switches. This ensures efficient traffic forwarding across the network.
Single Connection Between Spine and Leaf:
In an IP fabric, each leaf switch connects to every spine switch with a single connection. This ensures that traffic between any two leaf switches can travel through the spine layer in just two hops.
Juniper Reference:
Spine-Leaf Design: Juniper's IP fabric implementations are designed for scalability and low-latency routing, often using protocols like BGP for Layer 3 control.

NEW QUESTION # 73
......
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