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Juniper JN0-351 Exam Syllabus Topics:

Topic	Details
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	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 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	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 5	BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.
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	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 8	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.

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q71-Q76):

NEW QUESTION # 71
Which statement is correct about GRE tunnels?

A. The time-to-live field in the tunnel payload is decremented during transit.
B. GRE tunnels only support encapsulating IP traffic.
C. There are 20 bytes of overhead with GRE encapsulation.
D. GRE tunnels only support encapsulating non-IP traffic.

Answer: A

NEW QUESTION # 72
Referring to the exhibit, which three statements are correct? (Choose three.)

A. DHCP snooping is enabled for IPv6 traffic.
B. The DHCP snooping database is protected.
C. The IP source guard is enabled.
D. Dynamic ARP inspection is enabled.
E. DHCP snooping is enabled.

Answer: C,D,E

Explanation:
According to the Juniper documentation 1 , the output of the show vlans command displays the forwarding options for the VLAN, including the DHCP security features. In the exhibit, the output shows that DHCP security is enabled, and that ARP inspection and IP source guard are also enabled. These features work together to protect the switch from IP spoofing and ARP spoofing attacks. DHCP snooping builds a database of IP/MAC bindings by snooping DHCP messages. ARP inspection validates ARP packets against the DHCP snooping database and drops invalid packets. IP source guard checks the IP and MAC source addresses of packets against the DHCP snooping database and drops spoofed packets 2 3 . Therefore, the correct answer is A, B, and C.
The other options are not correct because:
* D. The DHCP snooping database is not protected by default. To protect the database from corruption or loss, you need to configure a file name and a location for storing the database, and enable periodic write operations to the file 4 . The exhibit does not show any such configuration.
* E. DHCP snooping is not enabled for IPv6 traffic by default. To enable DHCPv6 snooping, you need to configure a DHCPv6 relay agent and specify the trusted interfaces for DHCPv6 messages 5 . The exhibit does not show any such configuration.
References: show vlans | Junos OS , Understanding and Using DHCP Snooping | Junos OS , Understanding and Using Dynamic ARP Inspection (DAI) | Junos OS , Protecting the DHCP Snooping Database | Junos OS
, Understanding and Using DHCPv6 Snooping | Junos OS

NEW QUESTION # 73
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, you must manually clear the violation for the interface to send and receive traffic again.
B. By default, the interface will continue to send and receive traffic for all connected devices after a violation has occurred.
C. By default, the violation will automatically be cleared after 300 seconds and the interface will resume sending and receiving traffic for all learned devices.
D. By default, devices that are learned before the violation occurs are still allowed to send and receive traffic through the specific interface.

Answer: A

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 # 74
Referring to the exhibit, which two configuration changes must you apply for packets to reach from R1 to R3 using IS-IS? (Choose two.)

A. On R1, enable Level 1 on the ge-0/0/1 interface.
B. On R3 enable Level 1 on the ge-0/0/4 interface
C. On R3 disable Level 2 on the ge-0/0/4 interface.
D. On R1, disable Level 2 on the ge-0/0/1 interface.

Answer: A,B

Explanation:
A) On R1, enable Level 1 on the ge-0/0/1 interface. In IS-IS, both levels (Level 1 and Level 2) are enabled by default when you enable IS-IS on an interface1. Level 1 systems route within an area.
If the destination is outside an area, Level 1 systems route toward a Level 2 system. Therefore, enabling Level 1 on the ge-0/0/1 interface on R1 would allow packets to reach from R1 to R3.
D) On R3 enable Level 1 on the ge-0/0/4 interface Similarly, enabling Level 1 on the ge-0/0/4 interface on R3 would allow packets to reach from R1 to R3. These explanations are based on the IS-IS configuration documents and learning resources available at Juniper Networks1 and Cisco.

NEW QUESTION # 75
Which two statements correctly describe RSTP port roles? (Choose two.)

A. The root port is responsible for forwarding data to the root bridge.
B. The backup port is used as a backup for the root port.
C. The alternate port is a standby port for an edge port.
D. The designated port forwards data to the downstream network segment or device.

Answer: A,D

Explanation:
Explanation
In Rapid Spanning Tree Protocol (RSTP), there are several port roles that determine the behavior of the port in the spanning tree1.
Option A suggests that the designated port forwards data to the downstream network segment or device. This is correct because the designated port is the port on a network segment that has the best path to the root bridge1. It's responsible for forwarding frames towards the root bridge and sending configuration messages into its segment1.
Option D suggests that the root port is responsible for forwarding data to the root bridge. This is also correct because the root port is always the link directly connected to the root bridge, or the shortest path to the root bridge1. It's used to forward traffic towards the root bridge1.
Therefore, options A and D are correct.

NEW QUESTION # 76
......

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