Free Juniper JN0-351 Exam Actual Questions

The questions for JN0-351 were last updated On Mar 24, 2025

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Question No. 1

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 No. 2

Which two statements about BGP facilitate the prevention of routing loops between two autonomous systems? (Choose two.)

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Correct Answer: A, C

BGP (Border Gateway Protocol) is a protocol designed to exchange routing and reachability information among autonomous systems (AS) on the internet1.

Option A is correct.When an EBGP router advertises routes to its neighbors, it appends its AS number to the AS_PATH attribute1.This is a key mechanism in BGP to prevent routing loops1.

Option C is correct.BGP has a built-in loop prevention mechanism whereby if a BGP router detects its own AS in the AS_PATH attribute, it will drop the prefix and will not continue to advertise it2.This helps to prevent routing loops2.

Option B is incorrect.EBGP routers do not accept routes that contain their own AS number in the AS_PATH2.Instead, they drop such routes as part of the loop prevention mechanism2.

Option D is incorrect.While it's true that EBGP routers append their AS number when advertising routes, they do not prepend their AS number1.The term ''prepend'' in BGP usually refers to a technique used to influence path selection by artificially lengthening the AS_PATH3.


Question No. 3

Which two statements are true about the default VLAN on Juniper switches? (Choose two.)

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Correct Answer: A, D

On Juniper switches, the default VLAN is set to a VLAN ID of 1 by default12.This means that all interfaces on the switch are members of VLAN 1 until they are specifically assigned to another VLAN12. Therefore, option A is correct.

The default VLAN ID can be changed12.This allows network administrators to configure the switch to use a different VLAN as the default, if necessary12. Therefore, option D is correct.


Question No. 4

What is the maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation?

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Correct Answer: D

The maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation is1476 bytes1.This is because GRE packets are formed by the addition of the original packets and the required GRE headers1.These headers are 24-bytes in length and since these headers are added to the original frame, depending on the original size of the packet we may run into IP MTU problems1.The most common IP MTU is 1500-bytes in length (Ethernet)1.When the tunnel is created, it deducts the 24-bytes it needs to encapsulate the passenger protocols and that is the IP MTU it will use1.For example, if we are forming a tunnel over FastEthernet (IP MTU 1500) the IOS calculates the IP MTU on the tunnel as: 1500-bytes from Ethernet - 24-bytes for the GRE encapsulation = 1476-Bytes1.


Question No. 5

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.


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