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Juniper JN0-351 Exam Dumps

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JN0-351 Pack
Vendor: Juniper
Exam Code: JN0-351
Exam Name: Enterprise Routing and Switching, Specialist
Exam Questions: 65
Last Updated: January 7, 2026
Related Certifications: Juniper Data Center Certification
Exam Tags: Specialist Juniper experienced networking professionals
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Free Juniper JN0-351 Exam Actual Questions

Question No. 1

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?

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Correct Answer: B

The exhibit shows the configuration of RSTP on EX-4, which has the commandforce-version stp.This command forces the switch to use the legacy STP protocol instead of RSTP, even though the switch supports RSTP1.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 sequence2.

The other switches in the network are likely to be running RSTP, as it is the default protocol for EX Series switches3. 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 neighbor1.

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 thedelete protocols rstp force-versioncommand in configuration mode1.


Question No. 2

After receiving a BGP route, which two conditions are verified by the receiving router to ensure that the received route is valid? (Choose two)

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Correct Answer: B, C

Bis correct because the loops do not exist is one of the conditions that are verified by the receiving router to ensure that the received BGP route is valid.A loop in BGP means that a route has been advertised by the same AS more than once, which can cause routing instability and inefficiency1.To prevent loops, BGP uses the AS-path attribute, which lists the AS numbers that a route has traversed from the origin to the destination2.The receiving router checks the AS-path attribute of the received route and discards it if it finds its own AS number in the list2. This way, BGP avoids accepting routes that contain loops.

Cis correct because the next hop is reachable is one of the conditions that are verified by the receiving router to ensure that the received BGP route is valid.The next hop is the IP address of the next router that is used to forward packets to the destination network3.The receiving router checks the next hop attribute of the received route and verifies that it has a valid route to reach it3.If the next hop is not reachable, the received route is not usable and is rejected by the receiving router3. This way, BGP ensures that only feasible routes are accepted.


Question No. 3

Which two statements about BGP facilitate the prevention of routing loops between two autonomous systems? (Choose two.)

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Correct Answer: A, C

BGP (Border Gateway Protocol) is a protocol designed to exchange routing and reachability information among autonomous systems (AS) on the internet1.

Option A is correct.When an EBGP router advertises routes to its neighbors, it appends its AS number to the AS_PATH attribute1.This is a key mechanism in BGP to prevent routing loops1.

Option C is correct.BGP has a built-in loop prevention mechanism whereby if a BGP router detects its own AS in the AS_PATH attribute, it will drop the prefix and will not continue to advertise it2.This helps to prevent routing loops2.

Option B is incorrect.EBGP routers do not accept routes that contain their own AS number in the AS_PATH2.Instead, they drop such routes as part of the loop prevention mechanism2.

Option D is incorrect.While it's true that EBGP routers append their AS number when advertising routes, they do not prepend their AS number1.The term ''prepend'' in BGP usually refers to a technique used to influence path selection by artificially lengthening the AS_PATH3.


Question No. 4

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?

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Correct Answer: D

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.


Question No. 5

Exhibit

What does the * indicate in the output shown in the exhibit?

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Correct Answer: C

The exhibit shows the output of the commandshow vlans brief, which displays brief information about VLANs and their associated interfaces1.

The output has four columns: Routing instance, VLAN name, Interfaces, and Tagging.

The * symbol indicates that the interface is active, meaning that it is up and forwarding traffic1.This can be verified by the commandshow interfaces terse, which displays the status of the interfaces2.


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