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[Hardware] JN0-281 Testking | JN0-281 Exam Certification

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【Hardware】 JN0-281 Testking | JN0-281 Exam Certification

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Juniper JN0-281 Exam Syllabus Topics:
TopicDetails
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
  • 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
  • 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 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
  • 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.

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q49-Q54):NEW QUESTION # 49
What is the primary difference between IBGP and EBGP?
  • A. The way they advertise routes
  • B. The requirement for a full mesh topology
  • C. The administrative distance
  • D. The use of AS_PATH attribute
Answer: C

NEW QUESTION # 50
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 leaf device can communicate directly with other leaf devices.
  • C. Every spine device can communicate directly with other spine 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 # 51
Which two statements are true about how switches handle Layer 2 traffic? (Choose two.)
  • A. Traffic is forwarded based on the destination MAC address.
  • B. Traffic is forwarded based on the source MAC address.
  • C. The MAC address is learned based on the source MAC address.
  • D. The MAC address is learned based on the destination MAC address.
Answer: A,C
Explanation:
In Layer 2 switching, switches learn MAC addresses based on the source MAC address of incoming frames and forward frames based on the destination MAC address.
Step-by-Step Breakdown:
MAC Learning:
When a switch receives a frame, it records the source MAC address and the port on which it arrived. This allows the switch to know where to send traffic destined for that MAC address.
Forwarding Based on Destination:
The switch then looks at the destination MAC address and forwards the frame out of the port associated with that MAC address. If the MAC is unknown, the switch floods the frame to all ports.
Juniper Reference:
Layer 2 Switching: Juniper switches use source MAC addresses to build MAC tables and forward traffic based on the destination MAC address.

NEW QUESTION # 52
Which two protocols can you use for a data center underlay network? (Choose two)
  • A. EBGP
  • B. EVPN
  • C. OSPF
  • D. VXLAN
Answer: A,C

NEW QUESTION # 53
Exhibit:

Referring to the exhibit, what is the route preference of the 172.25.11.254 next hop?
  • A. 0
  • B. 1
  • C. 2
  • D. 3
Answer: B
Explanation:
In the exhibit, we see two next-hop addresses for the default static route (0.0.0.0/0):
The first next hop is 172.25.11.254, with no specified preference.
The second next hop is 172.25.11.200, with a specified preference of 140.
Step-by-Step Breakdown:
Default Static Route Preference:
If no preference is explicitly set for a next hop in Junos, it defaults to 5 for static routes.
Determining Preference:
In this case, the next hop 172.25.11.254 does not have an explicit preference defined, so it will use the default value of 5. The second next hop has a preference of 140, which is higher, meaning it will only be used if the primary next hop is unavailable. Juniper Reference: Static Route Preference: In Junos, the default preference for static routes is 5, and this value is applied unless overridden by the preference parameter.

NEW QUESTION # 54
......
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