Juniper JN0-351資格受験料 & JN0-351日本語

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Juniper JN0-351 認定試験の出題範囲：

トピック	出題範囲
トピック 1	OSPF: The concepts and operational details of OSPF are explored, providing tools for routing efficiency. Configuration and troubleshooting mastery ensure readiness for both the exam and complex enterprise environments.
トピック 2	Tunnels: The fundamentals of IP tunneling are emphasized, highlighting their requirements and functionalities. Mastery in configuring, monitoring, and troubleshooting tunnels equips professionals to meet the demands of the JN0-351 exam.
トピック 3	IS-IS: Aspiring Juniper networking professionals enhance their understanding of IS-IS routing protocols. This topic equips candidates with the knowledge to configure and monitor IS-IS systems, addressing specific exam challenges and practical applications.
トピック 4	Layer 2 Switching or VLANs: This topic deepens the understanding of Layer 2 switching operations within the Junos OS, including VLAN concepts and benefits. Experienced networking professionals gain insights into configuration, monitoring, and troubleshooting techniques essential for network segmentation and efficiency.
トピック 5	Layer 2 Security: This topic introduces Layer 2 protection mechanisms and firewall filters to fortify network security. Practical skills in configuring, monitoring, and troubleshooting these features prepare candidates to address exam objectives and real-world challenges effectively.
トピック 6	BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.
トピック 7	Protocol Independent Routing: An essential domain for understanding routing components outside protocol dependencies, this topic enhances expertise in configuring, monitoring, and troubleshooting critical elements.
トピック 8	Spanning Tree: Networking professionals explore the principles and advantages of the Spanning Tree Protocol (STP) to ensure loop-free topologies in Layer 2 networks.

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JN0-351日本語、JN0-351資格専門知識

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) 認定 JN0-351 試験問題 (Q156-Q161):

質問 # 156
In RSTP, which three port roles are associated with the discarding state? (Choose three.)

A. alternate
B. disabled
C. designated
D. root
E. backup

正解：A、B、E

解説：
In Rapid Spanning Tree Protocol (RSTP), there are several port roles that determine the behavior of the port in the spanning tree 1 2 3 . The roles include root, designated, alternate, backup, and disabled 1 2 3 .
The discarding state is associated with the backup, alternate, and disabled roles 1 2 3 . In a stable topology with consistent port roles throughout the network, RSTP ensures that every root port and designated port immediately transition to the forwarding state while all alternate and backup ports are always in the discarding state 2 . Disabled ports are also in the discarding state 3 .
Therefore, options B, C, and D are correct.

質問 # 157
Referring to the exhibit, which two statements are correct? (Choose two.)

A. The ge-0/0/10 interface will be part of the RSTP topology but will block incoming BPDUs.
B. The ge-0/0/13 interface will be selected as the forwarding interface.
C. The ge-0/0/10 interface will not participate in the RSTP topology.
D. This device must be selected as the root bridge.

正解：B、C

質問 # 158
What does the MAC limiting feature do on EX Series switches?

A. It limits the number of MAC addresses learned on a trunk port.
B. It limits the number of MAC addresses learned on an access port.
C. It limits the acceptable values for a MAC address to a specified range.
D. It limits the time a learned MAC address stays in the MAC routing table.

正解：B

解説：
MAC limiting protects against flooding of the Ethernet switching table (also known as the MAC forwarding table or Layer 2 forwarding table). This feature is enabled on interfaces (ports). MAC limiting sets a limit on the number of MAC addresses that can be learned on a single Layer 2 access port. The MAC limit value in the EX-series switch's default configuration is five MAC addresses. You can configure the MAC limit on an interface, on an interface in a VLAN, or on all interfaces. You can also specify the action to be taken when the MAC limit is exceeded, such as dropping packets, logging messages, or shutting down the interface.
Additionally, you can configure specific "allowed" MAC addresses for the access port. Any MAC address that is not in the list of configured addresses is not learned. Allowed MAC binds MAC addresses to a VLAN so that the address does not get registered outside the VLAN. References:
[EX] How to control MAC address access through Junos OS for EX Series switches1 Configuring MAC Limiting2 Understanding MAC Limiting and MAC Move Limiting3

質問 # 159
You are configuring an IS-IS IGP network and do not see the IS-IS adjacencies established. In this scenario, what are two reasons for this problem? (Choose two.)

A. The lo0 interface is not included as an IS-IS interface.
B. IP subnets are not a /30 address.
C. The Level 2 routers have mismatched areas.
D. MTU is not at least 1492 bytes.

正解：A、D

解説：
Explanation
Option A suggests that the MTU is not at least 1492 bytes. This is correct because IS-IS requires a minimum MTU of 1492 bytes to establish adjacencies1. If the MTU is less than this, IS-IS adjacencies will not be established1.
Option D suggests that the lo0 interface is not included as an IS-IS interface. This is also correct because the loopback interface (lo0) is typically used as the router ID in IS-IS1. If the loopback interface is not included in IS-IS, it could prevent IS-IS adjacencies from being established1.
Therefore, options A and D are correct.

質問 # 160
Which two actions are performed by the firewall filter shown in the exhibit? (Choose two.)

A. Term two requires a from statement.
B. All traffic is permitted.
C. Frames with the 88:05:00:29:3c:de source MAC address are accepted and logged.
D. Frames without the 88:05:00:29:3c:de source MAC address are discarded and logged.

正解：B、C

解説：
References:
* Enterprise Routing and Switching, Specialist (JNCIS-ENT) - Juniper Networks
* Enterprise Routing and Switching, Specialist (JNCIS-ENT) - Juniper Networks
* Juniper Networks Certified Specialist, Enterprise Routing & Switching ...
* Juniper Networks Certified Specialist, Enterprise Routing & Switching ...
* [Configuring Layer 2 Firewall Filters - TechLibrary - Juniper Networks]
* [Understanding Firewall Filter Terms - TechLibrary - Juniper Networks]

質問 # 161
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