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  • JN0-351: Enterprise Routing and Switching, Specialist

Juniper JN0-351 Exam

Certification Provider: Juniper
Exam Name: Enterprise Routing and Switching, Specialist
Duration: 90 Minutes
Number of questions in our database: 65
Exam Version: May. 06, 2024
JN0-351 Exam Official Topics:
  • 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

The questions for JN0-351 were last updated On May. 06, 2024

Question #2

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.)

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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 #3

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 #4

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?

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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.


Question #5

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

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Correct Answer: B, C

Bis correct because the loops do not exist is one of the conditions that are verified by the receiving router to ensure that the received BGP route is valid.A loop in BGP means that a route has been advertised by the same AS more than once, which can cause routing instability and inefficiency1.To prevent loops, BGP uses the AS-path attribute, which lists the AS numbers that a route has traversed from the origin to the destination2.The receiving router checks the AS-path attribute of the received route and discards it if it finds its own AS number in the list2. This way, BGP avoids accepting routes that contain loops.

Cis correct because the next hop is reachable is one of the conditions that are verified by the receiving router to ensure that the received BGP route is valid.The next hop is the IP address of the next router that is used to forward packets to the destination network3.The receiving router checks the next hop attribute of the received route and verifies that it has a valid route to reach it3.If the next hop is not reachable, the received route is not usable and is rejected by the receiving router3. This way, BGP ensures that only feasible routes are accepted.


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