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Latest JN0-281 Study Materials - Free JN0-281 Practice Exams

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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

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 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

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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Free JN0-281 Practice Exams & Valid JN0-281 Exam Tips

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q62-Q67):

NEW QUESTION # 62
Exhibit:

R2 received an OSPF update from R1, and it received the same update from R3.
Referring to the exhibit, what will R2 do?

A. R2 ignores the update from R3.
B. R2 does nothing with R3's update.
C. R2 ignores the update from R1.
D. R2 acknowledges R3 and discards it.

Answer: A

Explanation:
In the exhibit, R2 receives the same OSPF update from both R1 and R3. OSPF has mechanisms to prevent unnecessary processing of duplicate LSAs (Link-State Advertisements).
Step-by-Step Breakdown:
OSPF LSA Processing:
OSPF uses LSAs to exchange link-state information between routers. When a router receives an LSA, it checks if it already has a copy of the LSA in its Link-State Database (LSDB).
Duplicate LSAs:
If R2 has already received and processed the update from R1, it will ignore the update from R3 because it already has the same LSA in its database. OSPF uses the concept of flooding, but it does not reprocess LSAs that it already knows about.
R2 Behavior:
R2 will keep the update from R1 (the first one it received) and will ignore the same LSA from R3, as it is already in the LSDB.
Juniper
Reference: OSPF LSA Processing: Junos adheres to OSPF standards, ensuring that duplicate LSAs are not processed multiple times to avoid unnecessary recalculations.

NEW QUESTION # 63
Which OSPF packet types are used to establish and maintain neighbor relationships? (Choose two)

A. Link State Update packets
B. Link State Request packets
C. Database Description packets
D. Hello packets

Answer: C,D

NEW QUESTION # 64
Generated routes in a network are mainly used to:

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

Answer: D

NEW QUESTION # 65
What protocol and port does BGP use for control plane communication?

A. protocol UDP, port 159
B. protocol UDP, port 179
C. protocol TCP, port 159
D. protocol TCP, port 179

Answer: D

NEW QUESTION # 66
In the context of Link Aggregation Groups (LAG), what is the primary purpose of LACP?

A. To dynamically manage the bundling of several physical ports
B. To reduce the speed of data transfer
C. To provide a method for encrypting data packets
D. To increase the error rate in data transmission

Answer: A

NEW QUESTION # 67
......

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