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[Hardware] JN0-281 Actual Test, JN0-281 Valid Exam Tutorial

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【Hardware】 JN0-281 Actual Test, JN0-281 Valid Exam Tutorial

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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
  • 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 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.

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q41-Q46):NEW QUESTION # 41
Which two statements about IBGP are correct? (Choose two.)
  • A. By default, IBGP has a TTL of 1.
  • B. IBGP uses AS path for loop prevention.
  • C. By default, IBGP has a TTL of 255.
  • D. IBGP uses full mesh for loop prevention.
Answer: C,D
Explanation:
IBGP (Internal Border Gateway Protocol) is used to exchange routing information between routers within the same AS (Autonomous System).
Step-by-Step Breakdown:
TTL of 255:
By default, IBGP sessions are established with a TTL (Time to Live) value of 255. This allows IBGP neighbors to communicate over multiple hops within the AS without requiring any additional configuration.
Full Mesh Requirement:
IBGP requires a logical full mesh between all IBGP routers to ensure that routing information is fully distributed within the AS. Since IBGP does not propagate routes learned from one IBGP peer to another by default, a full mesh topology is needed unless route reflectors or BGP confederations are used.
Juniper
Reference: IBGP Full Mesh: Juniper recommends using route reflectors in large networks to simplify IBGP full-mesh requirements.

NEW QUESTION # 42
What is the primary function of a VLAN?
  • A. To encrypt network traffic.
  • B. To control network traffic based on MAC addresses.
  • C. To provide a routing mechanism between different networks.
  • D. To segment a network into multiple broadcast domains.
Answer: D

NEW QUESTION # 43
Which statement is correct about an IRB interface?
  • A. An IRB interface is a Layer 3 interface that can be used to route between VLANs.
  • B. An IRB interface trunks together VLANs on different switches.
  • C. An IRB interface switches traffic within the same VLAN.
  • D. An IRB interface is a physical Layer 3 interface that connects VLANs together.
Answer: A
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 # 44
When configuring OSPF, what is the purpose of defining areas?
  • A. To provide network redundancy.
  • B. To specify different encryption methods.
  • C. To control route advertisement and manage traffic.
  • D. To assign different IP address ranges.
Answer: C

NEW QUESTION # 45
Which statement is correct about a three-stage IP fabric underlay?
  • A. Every ingress interface into the fabric is only two hops away from the egress interface.
  • B. Every spine device can communicate directly with other spine devices.
  • C. Every leaf device can communicate directly with other leaf devices.
  • D. Every server that connects to a three-stage IP fabric must be multihomed.
Answer: A
Explanation:
In a three-stage IP fabric (also known as a Clos fabric), traffic between any two points (ingress to egress) in the fabric is only two hops away.
Step-by-Step Breakdown:
Three-Stage IP Fabric:
Leaf Layer: Leaf switches connect directly to servers and edge devices.
Spine Layer: Spine switches provide connectivity between leaf switches but do not connect to each other directly.
Two-Hop Communication:
In this architecture, every leaf switch is connected to every spine switch. Therefore, when a packet enters the fabric via an ingress leaf switch, it is forwarded to a spine switch, which then directs the packet to the correct egress leaf switch. This path always involves exactly two hops:
Ingress leaf → Spine → Egress leaf.
Benefits:
This consistent two-hop path ensures predictable latency and makes the network highly scalable while maintaining low complexity.
Juniper Reference:
IP Fabric Architecture: This two-hop property of Clos fabrics is a hallmark of spine-leaf designs, as supported by Juniper's QFX and EX switches in data centers.

NEW QUESTION # 46
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