Juniper JN0-351 Actual Free Exam Questions & Community Discussion

Exam Code/Number: JN0-351
Exam Name/Title: Enterprise Routing and Switching, Specialist (JNCIS-ENT)
Certification Provider: Juniper
Corresponding Certification: JNCIS-ENT

Exam Questions: 192
Updated On: Aug 05, 2026

Question #1

Which statement about the default action of MAC limiting is true when the number of MAC addresses has hit the limit set?

A. The switch will shut down the offending port for five minutes.

B. The switch will shut down MAC learning on the offending port for five minutes.

C. The switch stops learning MAC addresses on the offending port, but floods traffic out of all ports for the offending MAC address.

D. The switch stops learning MAC addresses on the offending port, and any traffic to or from the offending MAC address will be dropped.

Discussion 0

Correct Answer: D Vote an answer

Question #2

A host is connected to your EX Series switch using an interface with persistent MAC learning enabled. When you connect the host to another interface on the same switch, all traffic generated by the host is dropped. Which action should you perform to solve the problem?

A. Configure the interface as a trunk port.

B. Enter the clear ethernet switching table persistent learningcommand.

C. Enter the clear dhcp snooping databasecommand.

D. Disable dynamic ARP inspection.

Discussion 0

Correct Answer: B Vote an answer

Question #3

The ISP1.inet.0 route table has currently no routes in it.
What will happen when you commit the configuration shown on the exhibit?

A. The inet.0 route table will be completely overwritten by the ISP1.inet.0 route table.

B. The ISP1.inet.0 route table will be completely overwritten by the inet.0 route table.

C. The ISP1.inet.0 route table will be imported into the inet.0 route table.

D. The inet.0 route table will be imported into the ISP1.inet.0 route table.

Discussion 0

Correct Answer: D Vote an answer

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Question #4

Your switches are managed using Junos Space Network Director. You want to secure the switches using a Network Director filter profile. A filter profile containing one term shown in the exhibit is deployed to ports on managed devices.

Which traffic will be accepted by the filter?

A. Traffic containing a source MAC of 02:85:05:00:00:00/24 will be accepted.

B. All traffic will be accepted.

C. Traffic containing a destination MAC of 02:85:05:00:00:00/24 will be accepted.

D. No traffic will be accepted.

Discussion 0

Correct Answer: A Vote an answer

Question #5

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

A. The router with the lowest router ID become the DR.

B. The router with the highest MAC address become the DR

C. The routers perform another DR election.

D. The router with the highest router ID becomes the DR

Discussion 0

Correct Answer: D Vote an answer

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Question #6

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

A. The switch ports have a router attached.

B. All interfaces have elected a root bridge.

C. The interface is active.

D. The interface is down.

Discussion 0

Correct Answer: C Vote an answer

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Question #7

Which statement correctly describes the function of root protection in Junos OS spanning tree implementations?

A. It only applies to access ports.

B. It prevents a port from becoming the root port and receiving superior BPDUs that would change the root bridge.

C. It is used to protect the root bridge from broadcast storms.

D. It disables the spanning tree protocol entirely on the port.

Discussion 0

Correct Answer: B Vote an answer

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Question #8

Referring to the exhibit, which two configuration changes must you apply for packets to reach from R1 to R3 using IS-IS? (Choose two.)

A. On R3 enable Level 1 on the ge-0/0/4 interface

B. On R3 disable Level 2 on the ge-0/0/4 interface.

C. On R1, enable Level 1 on the ge-0/0/1 interface.

D. On R1, disable Level 2 on the ge-0/0/1 interface.

Discussion 0

Correct Answer: A,C Vote an answer

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Question #9

Referring to the exhibit, all users connected to the same VLAN can communicate with each other, but not with users on other VLANs in this network.

What must be configured to enable communication between the VLANs?

A. A separate routing device is required to forward traffic between the configured VLANs.

B. A logical IRB interface must be created and assigned to each VLAN.

C. The switch ports to which the users are connected should be configured as trunk ports.

D. A single logical IRB interface must be created and assigned to all three VLANs.

Discussion 0

Correct Answer: B Vote an answer

Question #10

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

A. The AS-path length is greater than 0.

B. The local preference is greater than 0.

C. The loops do not exist.

D. The next hop is reachable.

Discussion 0

Correct Answer: C,D Vote an answer

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Question #11

What is the default MAC age-out timer on an EX Series switch?

A. 30 minutes

B. 300 minutes

C. 300 seconds

D. 30 seconds

Discussion 0

Correct Answer: C Vote an answer

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Question #12

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

A. An import policy is applied to the RIB group.

B. Only routes in the last table are installed.

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

D. An export policy is applied to the RIB group.

Discussion 0

Correct Answer: A Vote an answer

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Question #13

Which statement is true about Layer 2 firewall filters on EX Series switches?

A. They are stateful and evaluated by the control plane.

B. They are stateless and evaluated by the forwarding plane.

C. They are stateless and evaluated by the control plane.

D. They are stateful and evaluated by the forwarding plane.

Discussion 0

Correct Answer: B Vote an answer

Question #14

Which statement correctly describes the BGP attribute Local Preference?

A. It is a well-known discretionary attribute that is never advertised to eBGP peers.

B. It is exchanged between eBGP peers to influence inbound traffic.

C. It is used within an AS to influence outbound path selection, with a higher value being preferred.

D. It is automatically set based on AS path length.

Discussion 0

Correct Answer: C Vote an answer

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