2026 High Hit-Rate Juniper Pdf JN0-351 Free

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Juniper JN0-351 Exam Syllabus Topics:

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

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q29-Q34):

NEW QUESTION # 29
Which two mechanisms are part of building and maintaining a Layer 2 bridge table? (Choose two.)

Answer: B,C

Explanation:
Option B is correct. Flooding is a mechanism used in Layer 2 bridging where the switch sends incoming packets to all its ports except for the port where the packet originated1. This is done when the switch doesn't know the destination MAC address or when the packet is a broadcast or multicast1.
Option C is correct. Learning is another mechanism used in Layer 2 bridging where the switch learns the source MAC addresses of incoming packets and associates them with the port on which they were received23. This information is stored in a MAC address table, also known as a bridge table23.
Option A is incorrect. Blocking is a state in Spanning Tree Protocol (STP) used to prevent loops in a network2. It's not a mechanism used in building and maintaining a Layer 2 bridge table2.
Option D is incorrect. Listening is also a state in Spanning Tree Protocol (STP) where the switch listens for BPDUs to make sure no loops occur in the network before transitioning to the learning state2. It's not a mechanism used in building and maintaining a Layer 2 bridge table2.


NEW QUESTION # 30
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?

Answer: C

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


NEW QUESTION # 31
Which two statements are correct about tunnels? (Choose two.)

Answer: C,D

Explanation:
A tunnel is a connection between two computer networks, in which data is sent from one network to another through an encrypted link. Tunnels are commonly used to secure data communications between two networks or to connect two networks that use different protocols.
Option B is correct, because tunnel endpoints must have a valid route to the remote tunnel endpoint. A tunnel endpoint is the device that initiates or terminates a tunnel connection. For a tunnel to be established, both endpoints must be able to reach each other over the underlying network. This means that they must have a valid route to the IP address of the remote endpoint 1 .
Option D is correct, because tunnels add additional overhead to packet size. Tunnels work by encapsulating packets: wrapping packets inside of other packets. This means that the original packet becomes the payload of the surrounding packet, and the surrounding packet has its own header and trailer. The header and trailer of the surrounding packet add extra bytes to the packet size, which is called overhead. Overhead can reduce the efficiency and performance of a network, as it consumes more bandwidth and processing power 2 .
Option A is incorrect, because BFD can be used to monitor tunnels. 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. BFD can also be used to monitor the connectivity of tunnels, such as GRE, IPsec, or MPLS.
Option C is incorrect, because IP-IP tunnels are stateless. IP-IP tunnels are a type of tunnels that use IP as both the encapsulating and encapsulated protocol. IP-IP tunnels are simple and easy to configure, but they do not provide any security or authentication features. IP-IP tunnels are stateless, which means that they do not keep track of the state or status of the tunnel connection. Stateless tunnels do not require any signaling or negotiation between the endpoints, but they also do not provide any error detection or recovery mechanisms.
References:
1 : What is Tunneling? | Tunneling in Networking 2 : What Is Tunnel In Networking, Its Types, And Its Benefits? : [Configuring Bidirectional Forwarding Detection] : [IP-IP Tunneling]


NEW QUESTION # 32
Your BGP neighbors, one in the USA and one in France, are not establishing a connection with each other.
Referring to the exhibit, which statement is correct?

Answer: B

Explanation:
In the configuration shown, BFD (Bidirectional Forwarding Detection) liveness detection is globally configured, but for BFD to work with specific BGP neighbors, it must be configured under each BGP neighbor or BGP group. Without specific BFD configuration at the neighbor or group level, BFD will not be used to monitor the BGP sessions, which might be causing the BGP neighbors not to establish a connection.


NEW QUESTION # 33
Which two statements about DHCP snooping are correct? (Choose two.)

Answer: A,C


NEW QUESTION # 34
......

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