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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 (old)
Exam Questions: 65
Last Updated: August 20, 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

You are concerned about spoofed MAC addresses on your LAN.

Which two Layer 2 security features should you enable to minimize this concern? (Choose two.)

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Correct Answer: A, C

Ais correct because dynamic ARP inspection (DAI) is a Layer 2 security feature that prevents ARP spoofing attacks. ARP spoofing is a technique that allows an attacker to send fake ARP messages to associate a spoofed MAC address with a legitimate IP address. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks.DAI validates ARP packets by checking the source MAC address and IP address against a trusted database, which is usually built by DHCP snooping1.DAI discards any ARP packets that do not match the database or have invalid formats1.

Cis correct because DHCP snooping is a Layer 2 security feature that prevents DHCP spoofing attacks. DHCP spoofing is a technique that allows an attacker to act as a rogue DHCP server and offer fake IP addresses and other network parameters to unsuspecting clients. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks. DHCP snooping filters DHCP messages by classifying switch ports as trusted or untrusted.Trusted ports are allowed to send and receive any DHCP messages, while untrusted ports are allowed to send only DHCP requests and receive only valid DHCP replies from trusted ports2.DHCP snooping also builds a database of MAC addresses, IP addresses, lease times, and binding types for each client2.


Question No. 2

What are two reasons for creating multiple areas in OSPF? (Choose two.)

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Correct Answer: A, D

Option A is correct. Creating multiple areas in OSPF can help to reduce the convergence time . This is because changes in one area do not affect other areas, so fewer routers need to run the SPF algorithm in response to a change.

Option D is correct. Creating multiple areas in OSPF can help to reduce Link State Advertisement (LSA) flooding across the network. This is because LSAs are not flooded out of their area of origin.


Question No. 3

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

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Correct Answer: D

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.


Question No. 4

Exhibit

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

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Correct Answer: A, D

A) On R1, enable Level 1 on the ge-0/0/1 interface.In IS-IS, both levels (Level 1 and Level 2) are enabled by default when you enable IS-IS on an interface1.Level 1 systems route within an area2.If the destination is outside an area, Level 1 systems route toward a Level 2 system2. Therefore, enabling Level 1 on the ge-0/0/1 interface on R1 would allow packets to reach from R1 to R3.

D) On R3 enable Level 1 on the ge-0/0/4 interfaceSimilarly, enabling Level 1 on the ge-0/0/4 interface on R3 would allow packets to reach from R1 to R3.

These explanations are based on the IS-IS configuration documents and learning resources available at Juniper Networks1and Cisco34.


Question No. 5

Which statement about aggregate routes is correct?

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Correct Answer: D

Aggregate routes are used for advertising summarized network prefixes12.They help minimize the number of routing tables in an IP network by consolidating selected multiple routes into a single route advertisement1.This approach is in contrast to non-aggregation routing, in which every routing table contains a unique entry for each route1.

Therefore, option D is correct. Options A, B, and C are not correct because:

Aggregate routes can be used with both static routing and dynamic routing protocols1.

Aggregate routes are not automatically generated for all of the subnets in a routing table.They need to be manually configured1.

Aggregate routes are not always preferred over more specific routes.The route selection process in Junos OS considers several factors, including route preference and metric, before determining the active route1.


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