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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: October 4, 2025
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

Which two statements are correct about tunnels? (Choose two.)

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Correct Answer: B, D

A tunnel is a connection between two computer networks, in which data is sent from one network to another through an encrypted link. Tunnels are commonly used to secure data communications between two networks or to connect two networks that use different protocols.

Option B is correct, because tunnel endpoints must have a valid route to the remote tunnel endpoint. A tunnel endpoint is the device that initiates or terminates a tunnel connection. For a tunnel to be established, both endpoints must be able to reach each other over the underlying network.This means that they must have a valid route to the IP address of the remote endpoint1.

Option D is correct, because tunnels add additional overhead to packet size. Tunnels work by encapsulating packets: wrapping packets inside of other packets. This means that the original packet becomes the payload of the surrounding packet, and the surrounding packet has its own header and trailer. The header and trailer of the surrounding packet add extra bytes to the packet size, which is called overhead.Overhead can reduce the efficiency and performance of a network, as it consumes more bandwidth and processing power2.

Option A is incorrect, because BFD can be used to monitor tunnels. BFD is a protocol that can be used to quickly detect failures in the forwarding path between two adjacent routers or switches. BFD can be integrated with various routing protocols and link aggregation protocols to provide faster convergence and fault recovery. BFD can also be used to monitor the connectivity of tunnels, such as GRE, IPsec, or MPLS.

Option C is incorrect, because IP-IP tunnels are stateless. IP-IP tunnels are a type of tunnels that use IP as both the encapsulating and encapsulated protocol. IP-IP tunnels are simple and easy to configure, but they do not provide any security or authentication features. IP-IP tunnels are stateless, which means that they do not keep track of the state or status of the tunnel connection. Stateless tunnels do not require any signaling or negotiation between the endpoints, but they also do not provide any error detection or recovery mechanisms.


1:What is Tunneling? | Tunneling in Networking2:What Is Tunnel In Networking, Its Types, And Its Benefits?: [Configuring Bidirectional Forwarding Detection] : [IP-IP Tunneling]

Question No. 2

You deployed a new EX Series switch with DHCP snooping enabled and you do not see any entries in the snooping databases for an interface. Which two Juniper configurations for that interface caused this issue? (Choose two.)

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Correct Answer: A, C

Ais correct because the interface is configured as a disabled port. A disabled port does not forward any traffic, including DHCP packets.Therefore, DHCP snooping cannot learn any MAC addresses or lease information from a disabled port1.

Cis correct because the interface is configured as a trunk port.By default, all trunk ports on the switch are trusted for DHCP snooping2. This means that DHCP snooping does not inspect or filter any DHCP packets received on a trunk port.Therefore, DHCP snooping does not add any entries to the snooping database for a trunk port2.


Question No. 3

What is the maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation?

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Correct Answer: D

The maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation is1476 bytes1.This is because GRE packets are formed by the addition of the original packets and the required GRE headers1.These headers are 24-bytes in length and since these headers are added to the original frame, depending on the original size of the packet we may run into IP MTU problems1.The most common IP MTU is 1500-bytes in length (Ethernet)1.When the tunnel is created, it deducts the 24-bytes it needs to encapsulate the passenger protocols and that is the IP MTU it will use1.For example, if we are forming a tunnel over FastEthernet (IP MTU 1500) the IOS calculates the IP MTU on the tunnel as: 1500-bytes from Ethernet - 24-bytes for the GRE encapsulation = 1476-Bytes1.


Question No. 4

Which two statements are true about the default VLAN on Juniper switches? (Choose two.)

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Correct Answer: A, D

On Juniper switches, the default VLAN is set to a VLAN ID of 1 by default12.This means that all interfaces on the switch are members of VLAN 1 until they are specifically assigned to another VLAN12. Therefore, option A is correct.

The default VLAN ID can be changed12.This allows network administrators to configure the switch to use a different VLAN as the default, if necessary12. Therefore, option D is correct.


Question No. 5

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.


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