Juniper JN0-351 Exam Actual Questions

Name: Enterprise Routing and Switching, Specialist
Brand: QA4Exam
SKU: JN0-351
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The questions for JN0-351 were last updated on Oct 3, 2024.

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Question No. 1

You implemented the MAC address limit feature with the shutdown action on all interfaces on your switch.

In this scenario, which statement is correct when a violation occurs?

ABy default, you must manually clear the violation for the interface to send and receive traffic again.

BBy default, the violation will automatically be cleared after 300 seconds and the interface will resume sending and receiving traffic for all learned devices.

CBy default, devices that are learned before the violation occurs are still allowed to send and receive traffic through the specific interface.

DBy default, the interface will continue to send and receive traffic for all connected devices after a violation has occurred.

Show Answer

Correct Answer: A

When the MAC address limit feature with the shutdown action is implemented on a switch, if a violation occurs, the interface is disabled and a system log entry is generated1.If the switch has been configured with the port-error-disable statement, the disabled interface recovers automatically upon expiration of the specified disable timeout1.However, if the switch has not been configured for auto-recovery from port error disabled conditions, you must manually clear the violation by running the clear ethernet-switching port-error command for the interface to send and receive traffic again1.This explanation is based on the Enterprise Routing and Switching Specialist (JNCIS-ENT) documents and learning resources available at Juniper Networks1.

Question No. 2

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.)

Aset routing---instances mgmtjunoa interface ge-0/0/0.0

Bset routing---instances mgmt_junos interface em1

Cset system management---instance

Dset routing---instances mgmt_junos

Show Answer

Correct Answer: C, D

To isolate management traffic in a non-default routing-instance on Junos-based devices, you can use theset system management-instanceandset routing-instances mgmt_junoscommands12.

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 namedmgmt_junos.The name of the dedicated management VRF instance is reserved and hardcoded asmgmt_junos; you cannot configure any other routing instance by the namemgmt_junos1.

Therefore, options C and D are correct.Options A and B are not correct because they attempt to assign an interface to themgmt_junosrouting instance, which is not necessary for isolating management traffic1.

Question No. 3

Exhibit

Referring to the exhibit, which statement is correct?

AThe local device is using a bridge priority of 4k.

BThe root bridge is using a bridge priority of 4k.

CThe root bridge has not been elected for this RSTP topology.

DThe local device is the root bridge for this RSTP topology.

Show Answer

Correct Answer: D

In a Rapid Spanning Tree Protocol (RSTP) topology, the root bridge is determined by the switch with the lowest bridge priority value12.If all switches have the same priority, then the root bridge is assigned to the switch whose MAC address's hex value is the lowest2.The default bridge priority value is 3276832. However, without the actual exhibit, it's difficult to definitively determine which device is the root bridge.But based on the options provided, if we assume that the local device has a lower bridge priority or a lower MAC address than other devices in the network, then it could be considered as the root bridge for this RSTP topology45.

Question No. 4

Which statement about aggregate routes is correct?

AAggregate routes can only be used for static routing but not for dynamic routing protocols.

BAggregate routes are automatically generated for all of the subnets in a routing table.

CAggregate routes are always preferred over more specific routes, even when the specific routes have a better path.

DAggregate routes are used for advertising summarized network prefixes.

Show Answer

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.

Question No. 5

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.)

AOn R1, enable Level 1 on the ge-0/0/1 interface.

BOn R3 disable Level 2 on the ge-0/0/4 interface.

COn R1, disable Level 2 on the ge-0/0/1 interface.

DOn R3 enable Level 1 on the ge-0/0/4 interface

Show Answer

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.

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