最新のJuniper JN0-281受験記 &合格スムーズJN0-281難易度受験料 |権威のあるJN0-281テスト資料

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Juniper JN0-281 認定試験の出題範囲：

トピック	出題範囲
トピック 1	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.
トピック 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.
トピック 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.
トピック 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.
トピック 5	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.

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Juniper Data Center, Associate (JNCIA-DC) 認定 JN0-281 試験問題 (Q60-Q65):

質問 # 60
Referring to the exhibit, how many milliseconds will pass before the BGP neighbor is considered dead?

A. 3000ms
B. 9000ms
C. 2000ms
D. 1000ms

正解：A

質問 # 61
What are two consequences of having all network devices in a single collision domain? (Choose two.)

A. The chance of packet collision is increased.
B. The amount of network resource consumption is increased.
C. The chance of packet collision is decreased.
D. The amount of network resource consumption does not change.

正解：A、B

解説：
A collision domain is a network segment where data packets can "collide" with one another when being sent on the same network medium.
Step-by-Step Breakdown:
Increased Collision Probability:
If all devices are in a single collision domain, the likelihood of packet collisions increases as more devices attempt to send packets simultaneously, leading to network inefficiencies.
Increased Resource Consumption:
More collisions result in increased network resource consumption as devices need to retransmit packets, causing higher utilization of bandwidth and slowing down network performance.
Juniper Reference:
Collision Domains: Proper network segmentation using switches reduces collision domains, thereby improving network performance and reducing packet collisions.

質問 # 62
What protocol and port does BGP use for control plane communication?

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

正解：B

質問 # 63
What is the main advantage of using an Overlay Network in a data center?

A. It offers higher physical bandwidth capacity.
B. It replaces the need for physical network infrastructure.
C. It provides direct Internet access to applications.
D. It simplifies physical network design by allowing multiple virtual topologies over it.

正解：D

質問 # 64
Referring to the exhibit, you notice that after committing the configuration, the ae0 and ae1 interfaces appear in a link down state.

Which statement is correct in this scenario?

A. The LAG interfaces are in aggressive mode.
B. The LAG interfaces are in a passive state.
C. No operational interfaces have been added to the LAG interfaces.
D. No traffic is traversing the LAG interfaces.

正解：C

解説：
In the exhibit, the ae0 and ae1 interfaces are in a link down state. This occurs when no physical interfaces (member interfaces) have been added to the LAG (Link Aggregation Group) interfaces, or the member interfaces are not operational.
Step-by-Step Breakdown:
LAG Configuration:
A LAG interface (aggregated Ethernet interface) is a logical interface that combines multiple physical interfaces for redundancy and increased bandwidth. The LAG will only be operational if at least one member interface is active and configured correctly.
No Operational Member Interfaces:
If no member interfaces are added or if the member interfaces are down, the LAG will remain in a down state, as shown in the exhibit for ae0 and ae1. Resolution:
Verify that physical interfaces have been added to the LAG using commands like:
LAG Interface Status: In Juniper, the link status of the LAG depends on its member interfaces, which must be operational for the LAG to function.

質問 # 65
......

Juniper JN0-281試験のAPPテストエンジンは、ほとんどの認定候補者がファッションであり、この新しい学習方法に簡単に適応できるため、少なくとも60％の受験者に人気があります。 JN0-281試験のAPPテストエンジンは、いつでもどこでも使用できると考える人がいます。また、候補者の一部は、このバージョンでは実際のテストで実際のシーンをシミュレートできると考えています。ブラウザを開くことができれば、学ぶことができます。また、オフラインで学習したい場合は、JN0-281試験のAPPテストエンジンをダウンロードしてインストールした後、キャッシュをクリアしないでください。

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