Juniper JN0-351 Practice Test For Better Exam Preparation 2026

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Juniper JN0-351 Exam Overview:

Certification Vendor:Juniper Networks
Exam Name:Enterprise Routing and Switching, Specialist (JNCIS-ENT)
Exam Number:JN0-351
Exam Price:USD varies by region (typically around $200–$300 USD)
Passing Score:~60-70%
Available Languages:English
Exam Duration:90 minutes
Exam Format:Multiple-answer multiple choice, Multiple choice, Single-answer multiple choice
Related Certifications:JNCIP-ENT
JNCIE-ENT
JNCIA-Junos
Real Exam Qty:65
Certificate Validity Period:3 years
Recommended Training:Juniper Learning Portal
Juniper Enterprise Routing & Switching Training
Exam Registration:Pearson VUE Juniper Exams
Juniper Certification Registration
Sample Questions:Juniper JN0-351 Sample Questions
Exam Way:Pearson VUE proctored exam (online or test center)
Pre Condition:JNCIA-Junos (JN0-105) recommended as prerequisite knowledge
Official Syllabus URL:https://www.juniper.net/us/en/training/certification/certification-tracks/enterprise-routing-switching/jncis-ent.html

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Juniper JN0-351 Exam Syllabus Topics:

TopicDetails
Topic 1
  • 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 2
  • 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 3
  • 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 4
  • 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 5
  • 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 6
  • BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.
Topic 7
  • 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.

Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q56-Q61):

NEW QUESTION # 56
In a LAN segment, which tie-breaker would spanning tree consider if equal-cost paths exist between two or more switches to the root bridge?

Answer: A


NEW QUESTION # 57
Two routers share the same highest priority and start time. In this situation, what is evaluated next when determining the designated router?

Answer: D

Explanation:
According to the OSPF protocol, the designated router (DR) is the router that acts as the focal point for exchanging routing information on a multi-access network segment, such as a LAN. The DR election process is based on the following criteria, in order of precedence:
The router with the highest OSPF priority becomes the DR. The default priority is 1, and a priority of 0 means the router will not participate in the election.
If there is a tie in priority, the router with the highest router ID becomes the DR. The router ID is a
32-bit number that uniquely identifies a router in an OSPF domain. It can be manually configured or automatically derived from the highest IP address of a loopback interface or a physical interface. If there is a tie in router ID, the router that was first to become an OSPF neighbor becomes the DR. In your scenario, two routers share the same highest priority and start time.
This means that they have equal chances of becoming the DR based on the first and third criteria. Therefore, the second criterion will be used to break the tie, which is the router ID. The router with the highest router ID will become the DR, and the other router will become the backup designated router (BDR), which is ready to take over the role of DR if it fails.


NEW QUESTION # 58
You need to configure a LAG between your switches. In this scenario, which two statements are correct? (Choose two.)

Answer: A,D

Explanation:
Up to 64 Ethernet interfaces can be grouped to form a LAG, and In a Junos Fusion, up to 1,000 LAGs are supported on QFX10002 switches acting as aggregation devices.
The LAG must be configured on both sides of the link.
The interfaces on either side of the link must be set to the same speed and be in full-duplex mode.


NEW QUESTION # 59
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.)

Answer: A,B,C

Explanation:
IS-IS (Intermediate System to Intermediate System) is a routing protocol that is designed to move information efficiently within a computer network 1 2 . It supports multiple protocol topologies, including IPv4, IPv6, and multicast 1 2 . Therefore, options C, E, and D are correct.


NEW QUESTION # 60
You are troubleshooting a BGP routing issue between your network and a customer router and are reviewing the BGP routing policies. Which two statements are correct in this scenario?
(Choose two.)

Answer: A,B

Explanation:
In BGP, routing policies are used to control the flow of routing information between BGP peers.
Option C suggests that import policies are applied after the RIB-In table. This is correct because import policies in BGP are applied to routes that are received from a BGP peer, before they are installed in the local BGP Routing Information Base (RIB-In). The RIB-In is a database that stores all the routes that are received from all peers.
Option D suggests that export policies are applied after the RIB-Local table. This is correct because export policies in BGP are applied to routes that are being advertised to a BGP peer, after they have been selected from the local BGP Routing Information Base (RIB-Local). The RIB-Local is a database that stores all the routes that the local router is using.


NEW QUESTION # 61
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