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  • JN0-351: Enterprise Routing and Switching, Specialist

Juniper JN0-351 Exam

Exam Name: Enterprise Routing and Switching, Specialist
Exam Code: JN0-351
Related Certification(s):
  • Juniper Data Center Certification Certifications
  • Juniper Certifications
Certification Provider: Juniper
Actual Exam Duration: 90 Minutes
Number of JN0-351 practice questions in our database: 65 (updated: May. 10, 2024)
Expected JN0-351 Exam Topics, as suggested by Juniper :
  • Topic 1: Describe the concepts, benefits, or functionalities of VLANs/ STP and Rapid Spanning Tree Protocol (RSTP) concepts
  • Topic 2: Identify the concepts, benefits, applications/ Demonstrate knowledge of how to configure, monitor
  • Topic 3: Describe the concepts, benefits, operations/ Demonstrate knowledge how to configure, monitor
  • Topic 4: Demonstrate knowledge of how to configure, monitor, or troubleshoot BGP/ Demonstrate knowledge of how to configure, monitor, or troubleshoot IP tunnels
  • Topic 5: Identify the concepts, benefits, or operations of Layer 2 firewall filters/ Demonstrate knowledge how to configure, monitor, or troubleshoot Spanning Tree
  • Topic 6: Demonstrate knowledge how to configure, monitor/ Port security, including MAC limiting, DHCP snooping
  • Topic 7: Describe the concepts, operations, or functionalities of IS-IS/ Describe the concepts, operations, or functionalities of OSPF
  • Topic 8: Describe the concepts, operations, or functionalities of BGP/ Identify the concepts, requirements, or functionalities of IP tunneling
  • Topic 9: Demonstrate knowledge of how to configure, monitor, or troubleshoot IS-IS/ Demonstrate knowledge how to configure, monitor, or troubleshoot OSPF
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Free Juniper JN0-351 Exam Actual Questions

Note: Premium Questions for JN0-351 were last updated On May. 10, 2024 (see below)

Question #1

Which statement is correct about the storm control feature?

Reveal Solution Hide Solution
Correct Answer: A

Option A is correct.The storm control feature is enabled in the factory-default configuration on EX Series switches12.On EX2200, EX3200, EX3300, EX4200, and EX6200 switches, the factory default configuration enables storm control for broadcast and unknown unicast traffic on all switch interfaces2.On EX4300 switches, the factory default configuration enables storm control on all Layer 2 switch interfaces1.

Option B is incorrect.The storm control feature does not require a special license on EX Series switches34.

Option C is incorrect. There's no information available that suggests the storm control feature is not supported on aggregate Ethernet interfaces.

Option D is incorrect.The storm control configuration applies to traffic at the ingress of an interface5, not just between the forwarding and control plane.


Question #3

You are an operator for a network running 1S-IS. Two routers are failing to form an adjacency. What are two reasons for this problem? (Choose two.)

Reveal Solution Hide Solution
Correct Answer: B, D

The two reasons for the failure to form an adjacency in a network running IS-IS could be:

B) There is no configured ISO address on any IS-IS interface.IS-IS requires each router interface to have an ISO address configured.Without this address, the routers cannot form an adjacency1.

D) The family iso configuration is missing from the adjacency interface.The 'family iso' configuration is essential for IS-IS to function correctly.If this configuration is missing from the adjacency interface, it could prevent the formation of an adjacency1.

These explanations are based on the Enterprise Routing and Switching Specialist (JNCIS-ENT) documents and learning resources available at Juniper Networks23.


Question #4

You have DHCP snooping enabled but no entries are automatically created in the snooping database for an interface on your EX Series switch. What are two reasons for the problem? (Choose two.)

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Correct Answer: B, C

The DHCP snooping feature in Juniper Networks' EX Series switches works by building a binding database that maps the IP address, MAC address, lease time, binding type, VLAN number, and interface information1.This database is used to filter and validate DHCP messages from untrusted sources1.

However, there are certain conditions that could prevent entries from being automatically created in the snooping database for an interface:

MAC limiting: If MAC limiting is enabled on the interface, it could potentially interfere with the operation of DHCP snooping.MAC limiting restricts the number of MAC addresses that can be learned on a physical interface to prevent MAC flooding attacks1. This could inadvertently limit the number of DHCP clients that can be learned on an interface, thus preventing new entries from being added to the DHCP snooping database.

Static IP address: If the device connected to the interface is configured with a static IP address, it will not go through the DHCP process and therefore will not have an entry in the DHCP snooping database1.The DHCP snooping feature relies on monitoring DHCP messages to build its database1, so devices with static IP addresses that do not send DHCP messages will not have their information added.

Therefore, options B and C are correct.Options A and D are not correct because performing a DHCPRELEASE would simply remove an existing entry from the database1, and Dynamic ARP inspection (DAI) uses the information stored in the DHCP snooping binding database but does not prevent entries from being created1.


Question #5

Exhibit

You are troubleshooting an issue where traffic to 192.168.10.0/24 is being sent to R1 instead of your desired path through R2.

Referring to the exhibit, what is the reason for the problem?

Reveal Solution Hide Solution
Correct Answer: C

The exhibit shows the output of the commandshow ip bgp, which displays information about the BGP routes in the routing table1. The output shows two routes for the destination 192.168.10.0/24, one from R1 and one from R2.

The route from R1 has a local preference of 200, while the route from R2 has a local preference of 100.Local preference is a BGP attribute that indicates the degree of preference for a route within an autonomous system (AS)2.A higher local preference means a more preferred route2.

BGP uses a best path selection algorithm to choose the best route for each destination among multiple paths.The algorithm compares different attributes of the routes in a specific order of precedence3.The first attribute that is compared is weight, which is a Cisco-specific attribute that is local to the router3.If the weight is equal or not set, the next attribute that is compared is local preference3.

In this case, both routes have the same weight of 0, which means that they are learned from external BGP (eBGP) peers3. Therefore, the next attribute that is compared is local preference.Since R1's route has a higher local preference than R2's route, it is chosen as the best path and installed in the routing table3. The other attributes, such as origin code and AS path, are not considered in this case.


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