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Juniper JN0-351 Exam Syllabus Topics:

Topic	Details
Topic 1	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 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	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 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	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	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 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.

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q83-Q88):

NEW QUESTION # 83
You implemented the MAC address limit feature with the shutdown action on all interfaces on your switch.
In this scenario, which statement is correct when a violation occurs?

A. By default, the interface will continue to send and receive traffic for all connected devices after a violation has occurred.
B. By default, the violation will automatically be cleared after 300 seconds and the interface will resume sending and receiving traffic for all learned devices.
C. By default, devices that are learned before the violation occurs are still allowed to send and receive traffic through the specific interface.
D. By default, you must manually clear the violation for the interface to send and receive traffic again.

Answer: D

Explanation:
Explanation
When the MAC address limit feature with the shutdown action is implemented on a switch, if a violation occurs, the interface is disabled and a system log entry is generated1. If the switch has been configured with the port-error-disable statement, the disabled interface recovers automatically upon expiration of the specified disable timeout1. However, if the switch has not been configured for auto-recovery from port error disabled conditions, you must manually clearthe violation by running the clear ethernet-switching port-error command for the interface to send and receive traffic again1. This explanation is based on the Enterprise Routing and Switching Specialist (JNCIS-ENT) documents and learning resources available at Juniper Networks1.

NEW QUESTION # 84
Exhibit.

You have configured the four EX Series switches with RSTP, as shown in the exhibit. You discover that whenever a link between switches goes up or down, the switches take longer than expected for RSTP to converge, using the default settings.
In this scenario, which action would solve the delay in RSTP convergence?

A. The force-version must be removed.
B. The max-age must be increased to 20
C. The hello-time must be increased.
D. The bridge priority for EX-4 must be set at 4000.

Answer: A

Explanation:
* The exhibit shows the configuration of RSTP on EX-4, which has the command force-version stp
. This command forces the switch to use the legacy STP protocol instead of RSTP, even though the switch supports RSTP 1 . This means that EX-4 will not be able to take advantage of the faster convergence and enhanced features of RSTP, such as edge ports, link type, and proposal/agreement sequence 2 .
* The other switches in the network are likely to be running RSTP, as it is the default protocol for EX Series switches 3 . Therefore, there will be a compatibility issue between EX-4 and the other switches, which will result in longer convergence times and suboptimal performance. The switch will also generate a warning message that says "Warning: STP version mismatch with neighbor" when it receives a BPDU from a RSTP neighbor 1 .
* To solve this problem, the force-version command must be removed from EX-4, so that it can run RSTP natively and interoperate with the other switches in the network. This will enable faster convergence and better stability for the network topology. To remove the command, you can use the delete protocols rstp force-version command in configuration mode 1 .

NEW QUESTION # 85
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?

A. The BFD liveness is set too high.
B. The BFD liveness is set too low.
C. The BFD liveness must be configured on the BGP group.
D. The BFD liveness must be configured on the BGP neighbor.

Answer: D

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 # 86
Which two statements are correct about using firewall filters on EX Series switches? (Choose two.)

A. You can apply firewall filters to both Layer 2 and Layer 3 traffic on an EX Series switch.
B. You can only apply firewall filters to Layer 2 traffic on an EX Series switch.
C. You can deploy only stateless firewall filters on an EX Series switch.
D. You can deploy both stateless and stateful firewall filters on an EX Series switch.

Answer: A,C

Explanation:
* A is correct because you can deploy only stateless firewall filters on an EX Series switch. A stateless firewall filter is a filter that evaluates each packet individually based on the header information, such as source and destination addresses, protocol, and port numbers 1 . A stateless firewall filter does not keep track of the state or context of a packet flow, such as the sequence number, flags, or session information
1 . EX Series switches support only stateless firewall filters, which are also called access control lists (ACLs) or packet filters 2 .
* C is correct because you can apply firewall filters to both Layer 2 and Layer 3 traffic on an EX Series switch. Layer 2 traffic is traffic that is switched within a VLAN or a bridge domain, while Layer 3 traffic is traffic that is routed between VLANs or networks 3 . EX Series switches support three types of firewall filters: port (Layer 2) firewall filters, VLAN firewall filters, and router (Layer 3) firewall filters 4 . You can apply these filters to different interfaces and directions to control the traffic entering or exiting the switch.

NEW QUESTION # 87
Which statement about configuring persistent MAC learning is correct?

A. Persistent MAC learning cannot be configured on redundant trunk groups.
B. Persistent MAC learning flushes dynamically learned MAC addresses on reboots.
C. Persistent MAC learning can be configured on access mode interfaces.
D. Persistent MAC learning requires 802.1X authentication.

Answer: C

NEW QUESTION # 88
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