Juniper JN0-351 Questions: Defeat Exam Preparation Stress [2026]

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Juniper JN0-351 Exam Syllabus Topics:

TopicDetails
Topic 1
  • 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.
Topic 2
  • 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 3
  • Spanning Tree: Networking professionals explore the principles and advantages of the Spanning Tree Protocol (STP) to ensure loop-free topologies in Layer 2 networks.
Topic 4
  • 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.
Topic 5
  • Protocol Independent Routing: An essential domain for understanding routing components outside protocol dependencies, this topic enhances expertise in configuring, monitoring, and troubleshooting critical elements.
Topic 6
  • 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 7
  • 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 8
  • 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.

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

NEW QUESTION # 73
What is the maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation?

Answer: B

Explanation:
The maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation is 1476 bytes
1 . This is because GRE packets are formed by the addition of the original packets and the required GRE headers 1 . These headers are 24-bytes in length and since these headers are added to the original frame, depending on the original size of the packet we may run into IP MTU problems 1 . The most common IP MTU is 1500-bytes in length (Ethernet) 1 . When the tunnel is created, it deducts the 24-bytes it needs to encapsulate the passenger protocols and that is the IP MTU it will use 1 . For example, if we are forming a tunnel over FastEthernet (IP MTU 1500) the IOS calculates the IP MTU on the tunnel as: 1500-bytes from Ethernet - 24-bytes for the GRE encapsulation = 1476-Bytes 1 .


NEW QUESTION # 74
What is the default keepalive time for BGP?

Answer: B

Explanation:
The default hold-time is 90 seconds, meaning that the default frequency for keepalive messages is 30 seconds.
https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/ref/statement/precision- timers-edit-protocols- bgp.html#:~:text=BGP%20on%20the%20local%20routing,keepalive%20messages%20is%2030
%20seconds


NEW QUESTION # 75
What is the default MAC age-out timer on an EX Series switch?

Answer: B

Explanation:
The default MAC age-out timer on an EX Series switch is 300 seconds 1 2 . The MAC age-out timer is the maximum time that an entry can remain in the MAC table before it "ages out," or is removed 3 1 . This configuration can influence efficiency of network resource use by affecting the amount of traffic that is flooded to all interfaces 1 . When traffic is received for MAC addresses no longer in the Ethernet routing table, the router floods the traffic to all interfaces 1 .


NEW QUESTION # 76
Which two statements about the firewall filter terms shown in the exhibit are true? (Choose two.)

Answer: B,C


NEW QUESTION # 77
You are asked to change the setting for the LSAs age out back to the default value.
In this scenario, which time interval will accomplish this task?

Answer: A

Explanation:
https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/statement/lsa-refresh- interval-edit-protocols-ospf.html


NEW QUESTION # 78
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