Questions and Answers for the JN0-351 Exam, Authentic 2026

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Juniper JN0-351 Exam Syllabus Topics:

Topic	Details
Topic 1	High Availability: This topic covers the importance and application of high availability within Junos OS environments. Knowledge in configuring and managing these components is critical for ensuring robust and uninterrupted network operations, aligning with exam expectations.
Topic 2	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.
Topic 3	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.
Topic 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.
Topic 5	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.

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q73-Q78):

NEW QUESTION # 73
What is the default MAC age-out timer on an EX Series switch?

A. 300 seconds
B. 30 seconds
C. 30 minutes
D. 300 minutes

Answer: A

Explanation:
Explanation
The default MAC age-out timer on an EX Series switch is 300 seconds12. The MAC age-out timer is the maximum time that an entry can remain in the MAC table before it "ages out," or is removed31. This configuration can influence efficiency of network resource use by affecting the amount of traffic that is flooded to all interfaces1. When traffic is received for MAC addresses no longer in the Ethernet routing table, the router floods the traffic to all interfaces1.

NEW QUESTION # 74
A new network requires multiple topology support. You decide to use IS-IS in this situation. Which three protocol topologies are supported in this scenario? (Choose three.)

A. IPsec
B. anycast
C. multicast
D. IPv4
E. IPv6

Answer: C,D,E

Explanation:
Explanation
IS-IS (Intermediate System to Intermediate System) is a routing protocol that is designed to move information efficiently within a computer network12. It supports multiple protocol topologies, including IPv4, IPv6, and multicast12. Therefore, options C, E, and D are correct.

NEW QUESTION # 75
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. The Level 2 routers have mismatched areas.
C. IP subnets are not a /30 address.
D. MTU is not at least 1492 bytes.

Answer: A,D

Explanation:
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.

NEW QUESTION # 76
How many bytes of overhead does an IP-IP tunnel add to a packet?

A. 14 bytes
B. 28 bytes
C. 20 bytes
D. 24 bytes

Answer: C

NEW QUESTION # 77
When electing a DIS in an IS-IS network, what is used to break a priority tie?

A. highest MAC address
B. lowest router ID
C. lowest MAC address
D. highest router ID

Answer: A

NEW QUESTION # 78
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