JN0-281認証試験、JN0-281受験記

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試験の準備方法-実用的なJN0-281認証試験試験-高品質なJN0-281受験記

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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	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 2	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.
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	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 5	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.

Juniper Data Center, Associate (JNCIA-DC) 認定 JN0-281 試験問題 (Q96-Q101):

質問 # 96
Which Junos operational mode command is used to troubleshoot issues with VLANs?

A. show interfaces
B. show ethernet-switching table
C. monitor traffic
D. show vlans

正解：B

質問 # 97
Which statement is correct about an IP fabric?

A. The entire IP fabric is one large broadcast domain.
B. Load sharing is provided by the routing protocol used.
C. Loop prevention is provided by the underlying spanning tree protocol used.
D. Transit traffic is passed through the network based on the original frame's destination MAC address.

正解：B

質問 # 98
When using spine and leaf fabric architectures, what is the role of each device? (Choose two.)

A. Spine nodes are used for host connectivity.
B. Leaf nodes are used for traffic to other leafs.
C. Spine nodes are used for transit to other leaf nodes.
D. Leaf nodes are used for host connectivity.

正解：C、D

解説：
In a spine-leaf fabric architecture, which is commonly used in data center designs, each device has a distinct role to ensure efficient and scalable network traffic flow.
Step-by-Step Breakdown:
Spine Nodes:
The spine nodes form the backbone of the fabric and are responsible for transit traffic between leaf nodes. They connect to every leaf switch and provide multiple paths for traffic between leaf nodes, ensuring redundancy and load balancing.
Leaf Nodes:
The leaf nodes are used for host connectivity. These switches connect to servers, storage, or edge routers. They also connect to the spine switches to reach other leaf switches.
Juniper Reference:
Spine-Leaf Architecture: In Juniper's IP fabric designs, spine switches handle inter-leaf communication, while leaf switches manage host and endpoint connectivity.

質問 # 99
Exhibit:

Referring to the exhibit, which statement is correct?

A. The configuration will commit successfully and BGP group 1 will operate as EBGP.
B. BGP group 1 requires a type internal parameter.
C. The configuration will commit successfully and BGP group 1 will operate as IBGP.
D. BGP group 1 requires a type external parameter.

正解：A

解説：
In the exhibit, BGP is configured with local AS 65101 and a neighbor at 172.16.1.1 in peer AS 65201.
This setup involves two different Autonomous Systems (AS), indicating an External BGP (EBGP) configuration.
Step-by-Step Breakdown:
EBGP vs. IBGP:
EBGP is used between routers in different ASes. In this case, the local AS is 65101 and the peer AS is 65201, meaning the BGP session is EBGP.
IBGP is used between routers within the same AS, which is not applicable here as the AS numbers are different.
BGP Group Configuration:
The configuration does not require a type external parameter because Junos OS automatically recognizes the session as EBGP when the local and peer AS numbers are different. The BGP session will operate as EBGP, and the configuration will commit successfully.
Juniper
Reference: BGP Configuration: In Juniper, EBGP is automatically recognized when the local and peer AS numbers differ, without needing to specify type external.

質問 # 100
What is the main purpose of Bidirectional Forwarding Detection (BFD)?

A. to determine if the forwarding routes are correct
B. to detect network path failures
C. to determine packet round-trip latency
D. to detect the forwarding protocol

正解：B

解説：
Bidirectional Forwarding Detection (BFD) is a network protocol used to detect failures in the network path between two devices quickly.
Step-by-Step Breakdown:
Path Failure Detection:
BFD provides a low-overhead mechanism for detecting failures in forwarding paths across Layer 3 networks. It is much faster than traditional routing protocol timers and can detect failures within milliseconds.
BFD in Routing:
BFD can be integrated with routing protocols like OSPF, BGP, or IS-IS to trigger a faster convergence when a network path goes down.
Juniper Reference:
BFD Configuration: Juniper devices use BFD to monitor network paths and ensure fast failure detection, enhancing network resilience.

質問 # 101
......

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JN0-281認証試験、JN0-281受験記

試験の準備方法-実用的なJN0-281認証試験試験-高品質なJN0-281受験記

Juniper JN0-281 認定試験の出題範囲：

Juniper Data Center, Associate (JNCIA-DC) 認定 JN0-281 試験問題 (Q96-Q101):

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