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Juniper JN0-281 考試大綱：

主題
簡介

主題 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.

主題 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.

主題 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.

主題 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.

主題 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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最新的 JNCIA-DC JN0-281 免費考試真題 (Q150-Q155):

問題 #150
What is the behavior of the default export policy for OSPF?

• A. Accept all routes.
• B. Forward all routes.
• C. Redistribute all routes.
• D. Reject all routes.

答案：D

解題說明：
In Junos, the default export policy for OSPF is to reject all routes from being exported.
Step-by-Step Breakdown:
Default Export Policy:
By default, OSPF in Junos does not export any routes to other routing protocols or neighbors. This is a safety mechanism to prevent unintended route advertisements. Custom Export Policies:
If you need to export routes, you must create a custom export policy that explicitly defines which routes to advertise.
Example: You can create an export policy to redistribute static or connected routes into OSPF.
Juniper
Reference: OSPF Export Behavior: In Juniper devices, the default policy for OSPF is to reject route advertisements unless explicitly configured otherwise through custom policies.

 

問題 #151
What is the primary purpose of using static routes in a network?

• A. To automatically adjust routes based on network traffic
• B. To provide a manually configured routing entry
• C. To aggregate multiple routes into one
• D. To generate routing entries dynamically

答案：B

 

問題 #152
Which of the following VLAN port modes exist in Junos OS? (Choose two)

• A. Trunk
• B. Tunnel
• C. Aggregated
• D. Access

答案：A,D

 

問題 #153
Which BGP message type is used to establish peering sessions?

• A. Keepalive
• B. Update
• C. Open
• D. Notification

答案：C

 

問題 #154
Which of the following are features of storm control on Junos switches? (Choose two)

• A. It can be configured to shut down a port during a storm.
• B. It supports thresholds for broadcast, multicast, and unknown unicast traffic.
• C. It automatically reroutes traffic during a storm.
• D. It encrypts broadcast and multicast traffic.

答案：A,B

 

問題 #155
......

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