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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	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	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 4	BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.
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.

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q99-Q104):

NEW QUESTION # 99
You have two OSPF routers forming an adjacency. R1 has a priority of 32 and a router ID of 192.168.1.2. R2 has a priority of 64 and a router ID of 192.168.1.1. The routers were started at the same time and all other OSPF settings are the default settings.
Which statement is correct in this scenario?

A. R1 will be the BDR.
B. Router IDs must match for an adjacency to form.
C. R2 will be the BDR.
D. At least three routers are required for a DR/BDR election

Answer: A

Explanation:
Explanation
In OSPF, the Designated Router (DR) and Backup Designated Router (BDR) are elected based on the priority of the routers1. The router with the highest priority becomes the DR, and the router with the second highest priority becomes the BDR1. If there is a tie in priority, then the router with the highest Router ID is chosen1.
In this scenario, R2 has a higher priority (64) than R1 (32), so R2 will become the DR1. Since R1 has the second highest priority, it will become the BDR1. Therefore, option D is correct.

NEW QUESTION # 100
You are a network operator who wants to add a second ISP connection and remove the default route to the existing ISP You decide to deploy the BGP protocol in the network. What two statements are correct in this scenario? (Choose two.)

A. IBGP peers advertise routes received from EBGP peers to other IBGP peers.
B. EBGP peers advertise routes received from IBGP peers to other EBGP peers.
C. IBGP updates the next-hop attribute to ensure reachability within an AS.
D. IBGP peers advertise routes received from IBGP peers to other IBGP peers.

Answer: A,B

Explanation:
The rules are as simple as follows:
1. IBGP peers advertise routes received from EBGP peers to other IBGP peers.
2. EBGP peers advertise routes learned from IBGP or EBGP peers to other EBGP peers.
https://community.juniper.net/discussion/understanding-how-ibgpebgp-behaves-in-junos

NEW QUESTION # 101
Which statement correctly describes the purpose of Bidirectional Forwarding Detection (BFD) in Junos OS?

A. BFD replaces the need for a routing protocol's own hello mechanism entirely.
B. BFD can only be used with static routes.
C. BFD is a routing protocol used to exchange prefix information.
D. BFD provides rapid failure detection for a link or path between two adjacent devices, independent of the routing protocol in use.

Answer: D

Explanation:
Bidirectional Forwarding Detection (BFD) is a lightweight protocol used to rapidly detect failures in the forwarding path between two adjacent devices, typically much faster than a routing protocol's native hello/dead timer mechanism. BFD can be associated with multiple routing protocols, such as OSPF, BGP, and static routes, to trigger faster reconvergence upon detecting a failure.

NEW QUESTION # 102
You are an operator for a network running IS-IS. Two routers are failing to form an adjacency.
What are two reasons for this problem? (Choose two.)

A. There are mismatched router IDs on the L2 routers.
B. There is a mismatched area ID between the L2 routers.
C. The family iso configuration is missing from the adjacency interface.
D. There is no configured ISO address on any IS-IS interface.

Answer: C,D

Explanation:
The two reasons for the failure to form an adjacency in a network running IS-IS could be:
B) There is no configured ISO address on any IS-IS interface. IS-IS requires each router interface to have an ISO address configured. Without this address, the routers cannot form an adjacency.
D) The family iso configuration is missing from the adjacency interface. The 'family iso' configuration is essential for IS-IS to function correctly. If this configuration is missing from the adjacency interface, it could prevent the formation of an adjacency.
These explanations are based on the Enterprise Routing and Switching Specialist (JNCIS-ENT) documents and learning resources available at Juniper Networks.

NEW QUESTION # 103
Which statement is correct regarding Junos OS unicast reverse path forwarding (RPF) checks?

A. RPF checks are used to prevent IP address spoofing by verifying that a packet arrives on the interface that would be used to route back to the source.
B. RPF checks require BGP to function.
C. RPF checks are applied only to outbound traffic.
D. RPF checks are only used for multicast traffic.

Answer: A

Explanation:
Unicast Reverse Path Forwarding (RPF) is a security mechanism that verifies whether a received packet's source address is reachable through the interface on which it arrived, based on the routing table. If the check fails, indicating a potentially spoofed source address, the packet can be discarded, helping to prevent IP spoofing-based attacks.

NEW QUESTION # 104
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