JN0-351 Exam Questions - Enterprise Routing and Switching, Specialist (JNCIS-ENT) Exam Tests & JN0-351 Test Guide

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Juniper JN0-351 Exam Overview:

Certification Vendor:	Juniper Networks
Exam Name:	Enterprise Routing and Switching, Specialist (JNCIS-ENT)
Exam Number:	JN0-351
Real Exam Qty:	65
Exam Duration:	90 minutes
Passing Score:	Not specified (Pass/Fail status available immediately)
Exam Price:	$300 USD
Certificate Validity Period:	3 years
Available Languages:	English
Related Certifications:	JNCIS-ENT
Exam Format:	Multiple-choice questions
Sample Questions:	Juniper JN0-351 Sample Questions
Exam Way:	Pearson VUE testing centers (In-person)
Pre Condition:	Recommended: JNCIA-Junos certification
Official Syllabus URL:	https://www.juniper.net/us/en/training/certification/tracks/enterprise-routing-switching/jncis-ent.html

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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	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 3	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 4	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 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	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 7	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.

Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q77-Q82):

NEW QUESTION # 77
Which two statements are correct about aggregate routes in Junos OS? (Choose two.)

A. An aggregate route is installed in the routing table regardless of whether contributing routes exist.
B. Aggregate routes cannot have their next hop set to "discard."
C. Aggregate routes can be configured with a policy to control which contributing routes are included.
D. An aggregate route becomes active only when at least one contributing route is present, similar to a generated route.

Answer: C,D

Explanation:
Similar to generated routes, an aggregate route in Junos OS becomes active in the routing table only when at least one contributing (more specific) route matching the aggregate is present.
Administrators can apply a policy to an aggregate route configuration to control which specific contributing routes are eligible to trigger the aggregate, and aggregate routes are commonly configured with a "discard" next hop to prevent routing loops for unused portions of the aggregated address space.

NEW QUESTION # 78
What is the default MAC age-out timer on an EX Series switch?

A. 30 seconds
B. 300 minutes
C. 300 seconds
D. 30 minutes

Answer: C

Explanation:
Explanation
The default MAC age-out timer on an EX Series switch is 300 seconds12. The MAC age-out timer is the maximum time that an entry can remain in the MAC table before it "ages out," or is removed31. This configuration can influence efficiency of network resource use by affecting the amount of traffic that is flooded to all interfaces1. When traffic is received for MAC addresses no longer in the Ethernet routing table, the router floods the traffic to all interfaces1.

NEW QUESTION # 79
Which two statements are correct about OSPF area types? (Choose two.)

A. A not-so-stubby area (NSSA) allows external routes to be imported and translated into the backbone.
B. A totally stubby area allows external routes but blocks summary LSAs.
C. A stub area does not allow external routes to be flooded into it.
D. The backbone area (area 0) must be a stub area.

Answer: A,C

Explanation:
A stub area blocks Type 5 external LSAs from being flooded into it, relying instead on a default route to reach external destinations. A not-so-stubby area (NSSA) is a variation that allows external routes to be imported locally as Type 7 LSAs, which the Area Border Router (ABR) then translates into Type 5 LSAs for propagation into the backbone.

NEW QUESTION # 80
Which two statements are true about an EX2300 device? (Choose two.)

A. By default, all switch ports are access ports.
B. By default, trunk ports can carry untagged traffic.
C. By default, all switch ports are associated with the default VLAN.
D. By default, all switch ports are trunk ports.

Answer: A,C

NEW QUESTION # 81
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 max-age must be increased to 20
B. The hello-time must be increased.
C. The bridge priority for EX-4 must be set at 4000.
D. The force-version must be removed.

Answer: D

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 # 82
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