Free Juniper JN0-351 Exam Practice Questions & Explanations

Last updated on: Sep 15, 2026
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Question 1

Exhibit

You are a network operator troubleshooting BGP connectivity.

Which two statements are correct about the output shown in the exhibit? (Choose two.)

Answer Options
Correct Answer: B, C
Explanation

Option B suggests that the BGP session is not established. This is correct because in the output, the state of the BGP session is shown as ''Idle''.In BGP, an ''Idle'' state means that the BGP session is not currently established1.

Option C suggests that R1 is configured for AS 65400.This is also correct because in the output, it's shown that the local AS number is 654001.The local AS number represents the Autonomous System (AS) number of the router on which you're checking the BGP session1.

Question 2

Exhibit

Your ISP is announcing a default route to both R1 and R2. You want your network routers to forward all Internet traffic through the R1 device

Which BGP attribute would you use?

Answer Options
Correct Answer: C
Explanation

The BGP attribute that you would use to forward all Internet traffic through the R1 device is thelocal preference1.

The local preference is an attribute that is used within an autonomous system (AS) and exchanged between iBGP routers1.It is used to select an exit point from the AS1.The path with the highest local preference is preferred1.By setting a higher local preference for the routes received from R1, you can make R1 the preferred exit point for all Internet traffic1.

Question 3

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

Answer Options
Correct Answer: A, C
Explanation

Ais correct because you can deploy only stateless firewall filters on an EX Series switch.A stateless firewall filter is a filter that evaluates each packet individually based on the header information, such as source and destination addresses, protocol, and port numbers1.A stateless firewall filter does not keep track of the state or context of a packet flow, such as the sequence number, flags, or session information1.EX Series switches support only stateless firewall filters, which are also called access control lists (ACLs) or packet filters2.

Cis correct because you can apply firewall filters to both Layer 2 and Layer 3 traffic on an EX Series switch.Layer 2 traffic is traffic that is switched within a VLAN or a bridge domain, while Layer 3 traffic is traffic that is routed between VLANs or networks3.EX Series switches support three types of firewall filters: port (Layer 2) firewall filters, VLAN firewall filters, and router (Layer 3) firewall filters4. You can apply these filters to different interfaces and directions to control the traffic entering or exiting the switch.

Question 4

Which two statements correctly describe RSTP port roles? (Choose two.)

Answer Options
Correct Answer: A, D
Explanation

In Rapid Spanning Tree Protocol (RSTP), there are several port roles that determine the behavior of the port in the spanning tree1.

Option A suggests that the designated port forwards data to the downstream network segment or device.This is correct because the designated port is the port on a network segment that has the best path to the root bridge1.It's responsible for forwarding frames towards the root bridge and sending configuration messages into its segment1.

Option D suggests that the root port is responsible for forwarding data to the root bridge.This is also correct because the root port is always the link directly connected to the root bridge, or the shortest path to the root bridge1.It's used to forward traffic towards the root bridge1.

Therefore, options A and D are correct.

Question 5

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

Answer Options
Correct Answer: D
Explanation

The default MAC age-out timer on an EX Series switch is300 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.

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