2026 Updated Juniper JN0-351 Certification Study Guide Pass JN0-351 Fast [Q38-Q55]

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2026 Updated Juniper JN0-351 Certification Study Guide Pass JN0-351 Fast

JN0-351 Dumps PDF 2026 Program Your Preparation EXAM SUCCESS

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	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 3	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 4	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.

QUESTION 38
Which statement is correct regarding Junos OS unicast reverse path forwarding (RPF) checks?

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.

RPF checks are only used for multicast traffic.

RPF checks require BGP to function.

RPF checks are applied only to outbound traffic.

QUESTION 39
What is the default hello interval on an OSPF interface?

10 seconds

20 seconds

30 seconds

60 seconds

QUESTION 40
You are configuring an IS-IS IGP network and do not see the IS-IS adjacencies established. In this scenario, what are two reasons for this problem? (Choose two.)

MTU is not at least 1492 bytes.

IP subnets are not a /30 address.

The Level 2 routers have mismatched areas.

The lo0 interface is not included as an IS-IS interface.

QUESTION 41
Exhibit

Referring to the exhibit, which statement is correct?

The local device is using a bridge priority of 4k.

The root bridge is using a bridge priority of 4k.

The root bridge has not been elected for this RSTP topology.

The local device is the root bridge for this RSTP topology.

QUESTION 42
In RSTP, which three port roles are associated with the discarding state? (Choose three.)

root

backup

alternate

disabled

designated

QUESTION 43
Which two statements are true about the default VLAN on Juniper switches? (Choose two.)

The default VLAN is set to a VLAN ID of 1 by default

The default VLAN ID is not assigned to any interface.

The default VLAN ID is not visible.

The default VLAN ID can be changed.

QUESTION 44
Which statement is correct about Junos OS VLAN tagging using the 802.1Q standard?

802.1Q tagging is only supported on point-to-point links.

802.1Q inserts a 4-byte tag into the Ethernet frame to identify VLAN membership.

802.1Q tagging removes the need for a native VLAN on trunk ports.

802.1Q is a Layer 3 protocol used for inter-VLAN routing.

QUESTION 45
Which two statements are true about the default VLAN on Juniper switches? (Choose two.)

The default VLAN is set to a VLAN ID of 1 by default

The default VLAN ID is not assigned to any interface.

The default VLAN ID is not visible.

The default VLAN ID can be changed.

QUESTION 46
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.)

IBGP updates the next-hop attribute to ensure reachability within an AS.

IBGP peers advertise routes received from EBGP peers to other IBGP peers.

IBGP peers advertise routes received from IBGP peers to other IBGP peers.

EBGP peers advertise routes received from IBGP peers to other EBGP peers.

QUESTION 47
Which two events cause a router to advertise a connected network to OSPF neighbors? (Choose two.)

When an OSPF adjacency is established.

When an interface has the OSPF passive option enabled.

When a static route to the 224.0.0.6 address is created.

When a static route to the 224.0.0.5 address is created.

QUESTION 48
Your BGP neighbors, one in the USA and one in France, are not establishing a connection with each other.
Referring to the exhibit, which statement is correct?

The BFD liveness is set too low.

The BFD liveness must be configured on the BGP neighbor.

The BFD liveness must be configured on the BGP group.

The BFD liveness is set too high.

QUESTION 49
After receiving a BGP route, which two conditions are verified by the receiving router to ensure that the received route is valid? (Choose two)

The AS-path length is greater than 0.

The loops do not exist.

The next hop is reachable.

The local preference is greater than 0.

QUESTION 50
You are troubleshooting a BGP routing issue between your network and a customer router and are reviewing the BGP routing policies. Which two statements are correct in this scenario?
(Choose two.)

Export policies are applied to routes in the RIB-ln table.

Import policies are applied to routes in the RIB-Local table.

Import policies are applied after the RIB-ln table.

Export policies are applied after the RIB-Local table.

QUESTION 51
You enable persistent MAC learning on your Juniper switch
In this scenario, which statement is correct?

You can enable persistent MAC learning on an interface where MAC learning is disabled.

You can enable persistent MAC learning on an interface that is part of a redundant trunk group.

You can only enable persistent MAC learning on an interface in access mode.

You can only enable persistent MAC learning on an interface on which 802.1x authentication is configured.

QUESTION 52
Which statement is correct about controlling the routes installed by a RIB group?

An import policy is applied to the RIB group.

Only routes in the last table are installed.

A firewall filter must be configured to install routes in the RIB groups.

An export policy is applied to the RIB group.

QUESTION 53
Two routers share the same highest priority and start time. In this situation, what is evaluated next when determining the designated router?

The router with the lowest router ID become the DR.

The router with the highest router ID becomes the DR

The routers perform another DR election.

The router with the highest MAC address become the DR

QUESTION 54
Which two statements are correct about using firewall filters on EX Series switches? (Choose two.)

You can deploy only stateless firewall filters on an EX Series switch.

You can only apply firewall filters to Layer 2 traffic on an EX Series switch.

You can apply firewall filters to both Layer 2 and Layer 3 traffic on an EX Series switch.

You can deploy both stateless and stateful firewall filters on an EX Series switch.

QUESTION 55
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?

At least three routers are required for a DR/BDR election

Router IDs must match for an adjacency to form.

R2 will be the BDR.

R1 will be the BDR.