Valid JN0-351 Test Duration, JN0-351 Brain Dumps

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Juniper JN0-351 Exam Syllabus Topics:

Topic	Details
Topic 1	Identify the concepts, benefits, applications Demonstrate knowledge of how to configure, monitor
Topic 2	Identify the concepts, benefits, or operations of Layer 2 firewall filters Demonstrate knowledge how to configure, monitor, or troubleshoot Spanning Tree
Topic 3	Describe the concepts, benefits, operations Demonstrate knowledge how to configure, monitor
Topic 4	Demonstrate knowledge how to configure, monitor Port security, including MAC limiting, DHCP snooping

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q12-Q17):

NEW QUESTION # 12
Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)

A. Redundant trunk groups load-balance traffic across two designated uplink interfaces.
B. If the active link fails, then the secondary link automatically takes over.
C. Layer 2 control traffic is permitted on the secondary link
D. Redundant trunk groups must be connected to the same aggregation switch.

Answer: B,D

Explanation:
Explanation
Redundant Trunk Groups (RTGs) on EX Series switches provide a simple solution for network recovery when a trunk port on a switch goes down1. They are configured on the access switch and contain two links: a primary or active link, and a secondary link1. Therefore, option B is correct because if the active link fails, the secondary link automatically starts forwarding data traffic without waiting for normal spanning-tree protocol convergence1.
Option D is also correct. In a typical enterprise network composed of distribution and access layers, RTGs are used where one Access switch is connected to two different uplink switches2. This implies that RTGs must be connected to the same aggregation switch2.

NEW QUESTION # 13
After receiving a BGP route, which two conditions are verified by the receiving router to ensure that the received route is valid? (Choose two)

A. The AS-path length is greater than 0.
B. The local preference is greater than 0.
C. The next hop is reachable.
D. The loops do not exist.

Answer: C,D

Explanation:
B is 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.
C is 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.

NEW QUESTION # 14
A new network requires multiple topology support. You decide to use IS-IS in this situation. Which three protocol topologies are supported in this scenario? (Choose three.)

A. IPsec
B. IPv6
C. anycast
D. IPv4
E. multicast

Answer: B,D,E

Explanation:
Explanation
IS-IS (Intermediate System to Intermediate System) is a routing protocol that is designed to move information efficiently within a computer network12. It supports multiple protocol topologies, including IPv4, IPv6, and multicast12. Therefore, options C, E, and D are correct.

NEW QUESTION # 15
Exhibit.

Which router will become the OSPF BDR if all routers are powered on at the same time?

A. R4
B. R2
C. R1
D. R3

Answer: A

Explanation:
Explanation
OSPF DR/BDR election is a process that occurs on multi-access data links. It is intended to select two OSPF nodes: one to be acting as the Designated Router (DR), and another to be acting as the Backup Designated Router (BDR).The DR and BDR are responsible for generating network LSAs for the multi-access network and synchronizing the LSDB with other routers on the same network1.
The DR/BDR election is based on two criteria: the OSPF priority and the router ID. The OSPF priority is a value between 0 and 255 that can be configured on each interface participating in OSPF. The default priority is
1. A priority of 0 means that the router will not participate in the election and will never become a DR or BDR. The router with the highest priority will become the DR, and the router with the second highest priority will become the BDR. If there is a tie in priority, then the router ID is used as a tie-breaker. The router ID is a
32-bit number that uniquely identifies each router in an OSPF domain.It can be manually configured or automatically derived from the highest IP address on a loopback interface or any active interface2.
In this scenario, all routers have the same priority of 1, so the router ID will determine the outcome of the election. The router IDs are shown in the exhibit as RID values. The highest RID belongs to R4 (10.10.10.4), so R4 will become the DR. The second highest RID belongs to R3 (10.10.10.3), so R3 will become the BDR.
References:
1:OSPF DR/BDR Election: Process, Configuration, and Tuning2:OSPF Designated Router (DR) and Backup Designated Router (BDR)

NEW QUESTION # 16
An update to your organization's network security requirements document requires management traffic to be isolated in a non-default routing-instance. You want to implement this requirement on your Junos-based devices.
Which two commands enable this behavior? (Choose two.)

A. set routing-instances mgmt_junos interface em1
B. set routing-instances mgmt_junos
C. set routing-instances mgmtjunoa interface ge-0/0/0.0
D. set system management-instance

Answer: B,D

Explanation:
Explanation
To isolate management traffic in a non-default routing-instance on Junos-based devices, you can use the set system management-instance and set routing-instances mgmt_junos commands12.
set system management-instance: This command associates the management interface (usually named fxp0 or em0 for Junos OS, or re0:mgmt-* or re1:mgmt-* for Junos OS Evolved) with the non-default virtual routing and forwarding (VRF) instance1. After you configure the non-default management VRF instance, management traffic no longer has to share a routing table with other control traffic or protocol traffic1.
set routing-instances mgmt_junos: This command creates a new routing instance named mgmt_junos. The name of the dedicated management VRF instance is reserved and hardcoded as mgmt_junos; you cannot configure any other routing instance by the name mgmt_junos1.
Therefore, options C and D are correct. Options A and B are not correct because they attempt to assign an interface to the mgmt_junos routing instance, which is not necessary for isolating management traffic1.

NEW QUESTION # 17
......

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