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Juniper JN0-351 Exam Syllabus Topics:

Topic	Details
Topic 1	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 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	BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.
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	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 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.
Topic 8	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.

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q67-Q72):

NEW QUESTION # 67
Which two statements are correct about the Junos OS "show configuration | compare rollback 1" command? (Choose two.)

A. Lines prefixed with a plus (+) indicate additions, while lines prefixed with a minus (-) indicate deletions.
B. It can only compare against the active configuration, not the candidate configuration.
C. It immediately applies the rollback configuration without requiring a commit.
D. It displays the differences between the current candidate configuration and a previously committed configuration.

Answer: A,D

Explanation:
The "show configuration | compare rollback 1" command displays a diff-style comparison between the current candidate configuration and a specified previous configuration (rollback 1 being the most recent prior committed configuration). In the output, lines prefixed with a plus sign (+) represent additions in the candidate configuration, while lines prefixed with a minus sign (-) represent deletions compared to the rollback version, helping administrators review changes before committing.

NEW QUESTION # 68
Exhibit

You have configured a GRE tunnel. To reduce the risk of dropping traffic, you have configured a keepalive OAM probe to monitor the state of the tunnel; however, traffic drops are still occurring.
Referring to the exhibit, what is the problem?

A. The hold-time value must be two times the keepalive-time value
B. LLDP needs to be removed from the gr-1/1/10.1 interface.
C. The " event link-adjacency-loss " option must be set.
D. For GRE tunnels, the OAM protocol requires that the BFD protocols also be used.

Answer: A

Explanation:
A keepalive OAM probe is a mechanism that can be used to monitor the state of a GRE tunnel and detect any failures in the tunnel path. A keepalive OAM probe consists of sending periodic packets from one end of the tunnel to the other and expecting a reply. If no reply is received within a specified time, the tunnel is considered down and the line protocol of the tunnel interface is changed to down 1 .
To configure a keepalive OAM probe for a GRE tunnel, you need to specify two parameters: the keepalive- time and the hold-time. The keepalive-time is the interval between each keepalive packet sent by the local router. The hold-time is the maximum time that the local router waits for a reply from the remote router before declaring the tunnel down 2 .
According to the Juniper Networks documentation, the hold-time value must be two times the keepalive-time value for a GRE tunnel 2 . This is because the hold-time value must account for both the round-trip time of the keepalive packet and the processing time of the remote router. If the hold-time value is too small, it may cause false positives and unnecessary tunnel flaps.
In the exhibit, the configuration shows that the keepalive-time is set to 10 seconds and the hold-time is set to
15 seconds for the gr-1/1/10.1 interface. This means that the local router will send a keepalive packet every 10 seconds and will wait for 15 seconds for a reply from the remote router. However, this hold-time value is not two times the keepalive-time value, which violates the recommended configuration. This may cause traffic drops if the remote router takes longer than 15 seconds to reply.
Therefore, option D is correct, because the hold-time value must be two times the keepalive-time value for a GRE tunnel. Option A is incorrect, because BFD is not required for GRE tunnels; BFD is another protocol that can be used to monitor tunnels, but it is not compatible with GRE keepalives 3 . Option B is incorrect, because the "event link-adjacency-loss" option is not related to GRE tunnels; it is an option that can be used to trigger an action when a link goes down 4 . Option C is incorrect, because LLDP does not need to be removed from the gr-1/1/10.1 interface; LLDP is a protocol that can be used to discover neighboring devices and their capabilities, but it does not interfere with GRE tunnels 5 .
References:
1 : Configuring Keepalive Time and Hold time for a GRE Tunnel Interface 2 : keepalive | Junos OS | Juniper Networks 3 : Configuring Bidirectional Forwarding Detection 4 : event link-adjacency-loss | Junos OS | Juniper Networks 5 : Understanding Link Layer Discovery Protocol

NEW QUESTION # 69
Referring to the exhibit, which two statements are correct? (Choose two.)

A. The ge-0/0/10 interface will not participate in the RSTP topology.
B. The ge-0/0/10 interface will be part of the RSTP topology but will block incoming BPDUs.
C. The ge-0/0/13 interface will be selected as the forwarding interface.
D. This device must be selected as the root bridge.

Answer: A,C

NEW QUESTION # 70
Which statement is correct about the Junos OS "traceoptions" configuration used for troubleshooting routing protocols?

A. Traceoptions can only be applied globally, not per protocol.
B. Traceoptions permanently modify the routing protocol's behavior.
C. Traceoptions enable detailed logging of protocol events and packets, useful for troubleshooting without affecting protocol operation.
D. Traceoptions require a reboot to take effect.

Answer: C

Explanation:
The "traceoptions" configuration in Junos OS enables detailed logging of protocol-specific events, state changes, and packet exchanges (such as OSPF hello packets or BGP updates), which is invaluable for troubleshooting protocol issues. Traceoptions can be applied at a global level or scoped to a specific protocol instance, and enabling them does not alter the actual operational behavior of the protocol itself.

NEW QUESTION # 71
Which statement correctly describes the function of an OSPF stub area's "no-summaries" option (totally stubby area)?

A. It is only applicable to NSSA areas.
B. It blocks only external (Type 5) LSAs but allows inter-area summary (Type 3) LSAs.
C. It blocks both external (Type 5) LSAs and inter-area summary (Type 3) LSAs, relying on a default route for all destinations outside the area.
D. It removes the need for an ABR.

Answer: C

Explanation:
Configuring the "no-summaries" option on a stub area creates a totally stubby area, which blocks both Type 5 external LSAs and Type 3 inter-area summary LSAs from being flooded into the area. Instead, routers within the totally stubby area rely on a single default route, injected by the ABR, to reach all destinations outside the area, further reducing the size of the routing table within the area.

NEW QUESTION # 72
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