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JN0-281 Reliable Test Question | New JN0-281 Test Duration

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Juniper JN0-281 Exam Syllabus Topics:

Topic
Details

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

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 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.

Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q133-Q138):

NEW QUESTION # 133
What roles do the Designated Router (DR) and Backup Designated Router (BDR) play in OSPF?

A. They determine the shortest path first algorithm.
B. They are responsible for generating LSAs for external routes.
C. They redistribute routes between OSPF and non-OSPF networks.
D. They reduce the number of adjacencies on broadcast networks.

Answer: D

NEW QUESTION # 134
What are two common reasons for BGP routes to be in the hidden state? (Choose two.)

A. Routes are being rejected by a policy
B. The next hop is unresolvable
C. The BGP neighbor is in a different autonomous system
D. Routes are being filtered from the inet.2 routing table

Answer: A,B

NEW QUESTION # 135
You want to minimize topology disruptions in your network when the rpd process restarts on a device.
Which service would accomplish this task?

A. link aggregation groups
B. graceful restart (GR)
C. Virtual Chassis
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 # 136
Generated routes in a network are mainly used to:

A. Reduce the overall size of the routing table.
B. Summarize external routes into the network.
C. Automatically create a route when a specified condition is met.
D. Manually configure specific network routes.

Answer: C

NEW QUESTION # 137
Which OSPF router type connects an OSPF area to non-OSPF networks?

A. Area Border Router (ABR)
B. Backbone Router
C. Autonomous System Boundary Router (ASBR)
D. Internal Router

Answer: C

NEW QUESTION # 138
......

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