Free JN0-351 exam questions in PDF & AI Tutor

QUESTION: 1

Exhibit.

Which router will become the OSPF BDR if all routers are powered on at the same time?

Answer(s): A

Explanation:

OSPF DR/BDR election is a process that occurs on multi-access data links. It is intended to select two OSPF nodes: one to be acting as the Designated Router (DR), and another to be acting as the Backup Designated Router (BDR). The DR and BDR are responsible for generating network LSAs for the multi- access network and synchronizing the LSDB with other routers on the same network1. The DR/BDR election is based on two criteria: the OSPF priority and the router ID. The OSPF priority is a value between 0 and 255 that can be configured on each interface participating in OSPF. The default priority is 1. A priority of 0 means that the router will not participate in the election and will never become a DR or BDR. The router with the highest priority will become the DR, and the router with the second highest priority will become the BDR. If there is a tie in priority, then the router ID is used as a tie-breaker. The router ID is a 32-bit number that uniquely identifies each router in an OSPF domain. It can be manually configured or automatically derived from the highest IP address on a loopback interface or any active interface2.
In this scenario, all routers have the same priority of 1, so the router ID will determine the outcome of the election. The router IDs are shown in the exhibit as RID values. The highest RID belongs to R4 (10.10.10.4), so R4 will become the DR. The second highest RID belongs to R3 (10.10.10.3), so R3 will become the BDR.

Reference:

1: OSPF DR/BDR Election: Process, Configuration, and Tuning 2: OSPF Designated Router (DR) and Backup Designated Router (BDR)

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QUESTION: 2

Exhibit.

What is the management IP address of the device shown in the exhibit?

10.210.20.233
172.23.12.100
128.0.0.1
172.23.11.10

Answer(s): B

Explanation:

The management IP address of a device is the IP address that is used to access the device for configuration and monitoring purposes. It is usually assigned to a dedicated management interface that is separate from the data interfaces. The management interface can be accessed via SSH, Telnet, HTTP, or other protocols.
In the exhibit, the list of interfaces and their statuses shows that the management interface is me0. This interface has an admin status of up, a protocol status of inet, a local address of 172.23.12.100/24, and a remote address of unspecified. This means that the me0 interface is active, has an IPv4 address assigned, and is not connected to another device. Therefore, the management IP address of the device shown in the exhibit is 172.23.12.100.

Reference:

: [Management Interfaces Overview] : [Displaying Interface Status Information]

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QUESTION: 3

Which three protocols support BFD? (Choose three.)

RSTP
BGP
OSPF
LACP
FTP

Answer(s): B,C,D

Explanation:

BFD is a protocol that can be used to quickly detect failures in the forwarding path between two adjacent routers or switches. BFD can be integrated with various routing protocols and link aggregation protocols to provide faster convergence and fault recovery. According to the Juniper Networks documentation, the following protocols support BFD on Junos OS devices1:
BGP: BFD can be used to monitor the connectivity between BGP peers and trigger a session reset if a failure is detected. BFD can be configured for both internal and external BGP sessions, as well as for IPv4 and IPv6 address families2.
OSPF: BFD can be used to monitor the connectivity between OSPF neighbors and trigger a state change if a failure is detected. BFD can be configured for both OSPFv2 and OSPFv3 protocols, as well as for point-to-point and broadcast network types3.
LACP: BFD can be used to monitor the connectivity between LACP members and trigger a link state change if a failure is detected. BFD can be configured for both active and passive LACP modes, as well as for static and dynamic LAGs4.
Other protocols that support BFD on Junos OS devices are:
IS-IS: BFD can be used to monitor the connectivity between IS-IS neighbors and trigger a state change if a failure is detected. BFD can be configured for both level 1 and level 2 IS-IS adjacencies, as well as for point-to-point and broadcast network types.
RIP: BFD can be used to monitor the connectivity between RIP neighbors and trigger a route update if a failure is detected. BFD can be configured for both RIP version 1 and version 2 protocols, as well as for IPv4 and IPv6 address families.
VRRP: BFD can be used to monitor the connectivity between VRRP routers and trigger a priority change if a failure is detected. BFD can be configured for both VRRP version 2 and version 3 protocols, as well as for IPv4 and IPv6 address families. The protocols that do not support BFD on Junos OS devices are:
RSTP: RSTP is a spanning tree protocol that provides loop prevention and rapid convergence in layer 2 networks. RSTP does not use BFD to detect link failures, but relies on its own hello mechanism that sends BPDU packets every 2 seconds by default.
FTP: FTP is an application layer protocol that is used to transfer files between hosts over a TCP connection. FTP does not use BFD to detect connection failures, but relies on TCP's own retransmission and timeout mechanisms.

Reference:

1: [Configuring Bidirectional Forwarding Detection] 2: [Configuring Bidirectional Forwarding Detection for BGP] 3: [Configuring Bidirectional Forwarding Detection for OSPF] 4: [Configuring Bidirectional Forwarding Detection for Link Aggregation Control Protocol] : [Configuring Bidirectional Forwarding Detection for IS-IS] : [Configuring Bidirectional Forwarding Detection for RIP] :
[Configuring Bidirectional Forwarding Detection for VRRP] : [Understanding Rapid Spanning Tree Protocol] : [Understanding FTP]

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QUESTION: 4

Exhibit.

The ispi _ inet. 0 route table has currently no routes in it.
What will happen when you commit the configuration shown on the exhibit?

The inet. 0 route table will be completely overwritten by the ispi . inet. 0 route table.
The inet. 0 route table will be imported into the ispi . inet. 0 route table.
The ISPI . inet. 0 route table will be completely overwritten by the inet. o route table.
The ISPI . inet. 0 route table will be imported into the inet. 0 route table.

Answer(s): B

Explanation:

The configuration shown in the exhibit is an example of a routing instance of type virtual-router. A routing instance is a collection of routing tables, interfaces, and routing protocol parameters that create a separate routing domain on a Juniper device1. A virtual-router routing instance allows administrators to divide a device into multiple independent virtual routers, each with its own routing table2.
The configuration also includes a rib-group statement, which is used to import routes from one routing table to another. A rib-group consists of an import-rib statement, which specifies the source routing table, and an export-rib statement, which specifies the destination routing table. In this case, the rib-group name is inet-to-ispi, and the import-rib statement specifies inet.0 as the source routing table. The export-rib statement specifies ispi.inet.0 as the destination routing table. This means that the routes from inet.0 will be imported into ispi.inet.0. Therefore, the correct answer is B. The inet.0 route table will be imported into the ispi.inet.0 route table.

Reference:

1: Routing Instances Overview 2: Virtual Routing Instances : [rib-group (Routing Options)]

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QUESTION: 5

Which statement is correct about graceful Routing Engine switchover (GRES)?

The PFE restarts and the kernel and interface information is lost.
GRES has a helper mode and a restarting mode.
When combined with NSR, routing is preserved and the new master RE does not restart rpd.
With no other high availability features enabled, routing is preserved and the new master RE does not restart rpd.

Answer(s): C

Explanation:

The Graceful Routing Engine Switchover (GRES) feature in Junos OS enables a router with redundant Routing Engines to continue forwarding packets, even if one Routing Engine fails1. GRES preserves interface and kernel information, ensuring that traffic is not interrupted1. However, GRES does not preserve the control plane1.
To preserve routing during a switchover, GRES must be combined with either Graceful Restart protocol extensions or Nonstop Active Routing (NSR)1.
When GRES is combined with NSR, nearly 75 percent of line rate worth of traffic per Packet Forwarding Engine remains uninterrupted during GRES1. Any updates to the primary Routing Engine are replicated to the backup Routing Engine as soon as they occur1.
Therefore, when GRES is combined with NSR, routing is preserved and the new master RE does not restart rpd1.

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What the JN0-351 Exam Tests and How to Pass It

The Enterprise Routing and Switching, Specialist (JNCIS-ENT) certification is a critical milestone for network engineers who work with Juniper Networks technology in enterprise environments. This certification validates that a professional possesses the intermediate-level knowledge required to configure, manage, and troubleshoot Junos OS-based routing and switching platforms. Employers in the telecommunications, enterprise IT, and managed service provider sectors frequently look for this credential to ensure their staff can handle complex network architectures. By passing this certification exam, candidates demonstrate they have moved beyond basic connectivity tasks and are capable of managing sophisticated routing protocols and high-availability network designs. It serves as a foundational step for those aiming to pursue higher-level Juniper certification tracks, such as the professional or expert levels, which are essential for senior network architecture roles.

Achieving the JNCIS-ENT designation requires a deep understanding of how Juniper hardware functions within a modern enterprise network. Professionals who hold this certification are expected to be proficient in the command-line interface (CLI) of the Junos operating system, which is distinct from other vendor platforms. This exam is not merely about memorizing commands; it is about understanding the underlying logic of how Juniper devices process traffic, manage routing tables, and maintain network stability. Because the role of a network specialist involves maintaining uptime and ensuring secure data transmission, this certification acts as a benchmark for technical competency. Candidates who successfully navigate the exam demonstrate that they can apply theoretical networking principles to real-world scenarios, making them valuable assets to any organization that relies on Juniper infrastructure.

What the JN0-351 Exam Covers

The JN0-351 exam covers a comprehensive range of technical domains that are essential for managing enterprise-grade networks. Candidates will be tested on their ability to implement and troubleshoot Layer 2 switching technologies, including the configuration of VLANs and the nuances of Spanning Tree Protocol (STP) to prevent loops in a switched environment. The exam also evaluates knowledge of Layer 2 security features, which are vital for protecting the network edge from unauthorized access and common attacks. Furthermore, the curriculum includes protocol-independent routing, which forms the basis of how traffic is forwarded across the network. The exam also requires a solid grasp of interior gateway protocols such as OSPF and IS-IS, as well as the exterior gateway protocol BGP, which is used for inter-domain routing. Finally, the exam assesses the ability to implement tunnels for connectivity and high availability features to ensure network redundancy, all of which are explored through our comprehensive practice questions.

Among these topics, BGP (Border Gateway Protocol) often presents the most significant challenge for candidates due to its complexity and the sheer number of attributes involved in path selection. Unlike simpler interior protocols, BGP requires a deep understanding of how route policies, path attributes like AS-Path, Local Preference, and MED, and the BGP decision process interact to influence traffic flow. Candidates must be able to demonstrate not just how to configure a BGP neighbor relationship, but how to manipulate traffic patterns using complex policy configurations. This requires a high level of technical precision, as a misconfiguration in a BGP policy can lead to routing loops or traffic black-holing. Mastering this topic requires extensive practice, as the exam often presents scenario-based questions that test whether a candidate can identify the correct attribute to modify to achieve a specific routing outcome.

Are These Real JN0-351 Exam Questions?

Our platform provides practice questions that are sourced and verified by the community, consisting of IT professionals and recent test-takers who have sat for the actual exam. These individuals contribute their knowledge to ensure that our practice questions reflect what appears on the real exam because they are sourced from the community experience. We prioritize accuracy and relevance, ensuring that every item is community-verified to meet the high standards required for serious exam preparation. If you have been searching for JN0-351 exam dumps or braindump files, our community-verified practice questions offer something more valuable, each question is verified and explained by IT professionals who recently passed the exam. We do not provide unauthorized or leaked content, as our goal is to help you learn the material thoroughly so you can pass the certification exam based on your own skills and understanding.

The community verification process is the cornerstone of our platform's reliability and effectiveness. When a question is added, it undergoes a rigorous review where users discuss the answer choices, debate the technical reasoning, and flag any potentially incorrect or outdated information. This collaborative environment allows users to share context from their recent exam experience, which helps clarify ambiguous concepts and provides insight into how Juniper frames its questions. By engaging with these discussions, you gain a better understanding of the subject matter than you would by simply memorizing answers. This peer-reviewed approach ensures that the practice questions remain accurate and aligned with the current objectives of the Juniper certification, providing a trustworthy resource for your study efforts.

How to Prepare for the JN0-351 Exam

Effective exam preparation for the JN0-351 requires a balanced approach that combines theoretical study with hands-on practice. It is highly recommended that you set up a lab environment, either using physical hardware or virtualized instances like vSRX or vMX, to practice configuring the protocols covered in the exam. You should spend significant time reading the official Juniper documentation, as it is the most accurate source of information regarding Junos OS behavior and configuration syntax. To reinforce your learning, use our practice questions to test your knowledge across all domains. Every practice question includes a free AI Tutor explanation that breaks down the reasoning behind the correct answer, so you understand the concept, not just the answer. This method ensures that you are building a solid foundation of knowledge that will serve you well beyond the exam date.

A common mistake candidates make is relying solely on rote memorization of questions and answers, which often leads to failure when the exam presents scenario-based questions that require applied knowledge. The JN0-351 exam is designed to test your ability to troubleshoot and configure networks in real-world situations, meaning you must understand the "why" behind every configuration command. Another frequent error is neglecting time management during the exam; candidates often spend too much time on a single difficult question, leaving them rushed at the end. To avoid this, use our practice questions to simulate the time constraints of the actual exam, allowing you to practice identifying the core issue quickly and selecting the correct configuration or troubleshooting step. By focusing on conceptual understanding and consistent practice, you will be well-prepared to tackle the challenges of the Juniper certification.

What to Expect on Exam Day

On the day of your exam, you should expect a professional testing environment, typically administered through a testing center or via an online proctoring service like Pearson VUE. The exam format generally consists of multiple-choice questions, and you may encounter scenario-based questions that require you to analyze a network topology or a configuration snippet to determine the correct outcome. You will be given a set amount of time to complete the exam, and it is crucial to manage this time effectively by answering the questions you are confident about first and flagging the more complex ones for later review. Juniper certification exams are rigorous and require a high level of focus, so ensure you are well-rested and prepared to apply your technical knowledge under pressure. The exam is designed to be a fair assessment of your skills, provided you have put in the necessary study time and hands-on practice.

Who Should Use These JN0-351 Practice Questions

These practice questions are intended for network engineers, system administrators, and technical support professionals who are actively pursuing the JNCIS-ENT certification. Ideally, candidates should have at least six months to a year of experience working with networking technologies and some exposure to Juniper devices or the Junos OS. Whether you are looking to validate your existing skills for a job promotion or aiming to enter a new role that requires Juniper expertise, this certification exam is a significant step in your career progression. By using our platform for your exam preparation, you are ensuring that you have access to high-quality, community-verified resources that help you bridge the gap between theoretical knowledge and practical application. This certification is a recognized standard in the industry, and passing it demonstrates a commitment to professional excellence in the field of enterprise routing and switching.

To get the most out of these practice questions, do not simply read the answer and move on to the next item. Engage with the AI Tutor explanation provided for each question to ensure you fully grasp the underlying networking principles, and participate in the community discussions to see how others approach the same problems. If you find yourself consistently getting questions wrong in a specific topic area, such as BGP or OSPF, go back to your lab environment and re-test those configurations until you are comfortable with the behavior of the protocols. Flag the questions you find difficult and revisit them periodically to track your progress and ensure that your understanding has improved. Browse the questions above and use the community discussions and AI Tutor to build real exam confidence.

Juniper JN0-351 Exam Actual Questions Enterprise Routing and Switching, Specialist (JNCIS-ENT) (Page 4 )

QUESTION: 1

Explanation:

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QUESTION: 2

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QUESTION: 3

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QUESTION: 4

Explanation:

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QUESTION: 5

Explanation:

What the JN0-351 Exam Tests and How to Pass It

What the JN0-351 Exam Covers

Are These Real JN0-351 Exam Questions?

How to Prepare for the JN0-351 Exam

What to Expect on Exam Day

Who Should Use These JN0-351 Practice Questions

Juniper JN0-351 Exam Actual Questions
Enterprise Routing and Switching, Specialist (JNCIS-ENT) (Page 4 )