Free JN0-420 Exam Dumps Preview

Question 1

Single choice

Click the Exhibit button.
Exhibit:

What will executing the program shown in the exhibit retrieve from a Junos device?

1. A

   the previous configuration changes of the device

2. B

   the current memory utilization

3. C

   the FPC inventory of the device

4. D

   the current software version on the device

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Correct answerD

Question 2

Multiple choice

You want to enable an unsigned Python op script named inventory.py that will be stored on a local Junos device.

Which two commands are needed to accomplish this task? (Choose two)

1. A

   set system scripts op allow-url-for-python

2. B

   set system scripts op file inventory.py

3. C

   set system scripts op no-allow-url

4. D

   set system scripts language python

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Correct answersB, D

Explanation

References:
https://www.juniper.net/documentation/en_US/junos/topics/example/junos-script-automation-op-script-changing-configuration-python.html

Question 3

Multiple choice

Click the Exhibit button.
Exhibit:

Referring to the exhibit, what are two results of the Python operational script? (Choose two)

1. A

   It disables a user-selected interface

2. B

   It commits the configuration

3. C

   It deactivates a user-selected interface

4. D

   It does not commit the configuration

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Correct answersA, B

Question 4

Multiple choice

Using the RESTful API on a Junos device, you are able to retrieve configuration information in which three formats? (Choose three)

1. A

   YAML

2. B

   XML

3. C

   plain text

4. D

   GPB

5. E

   JSON

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Correct answersB, C, E

Explanation

References:
https://www.juniper.net/documentation/en_US/junos/information-products/pathway-pages/rest-api/rest-api.html

Question 5

Multiple choice

What are three supported languages for operational scripts on Junos devices? (Choose three)

1. A

   Python

2. B

   XSLT

3. C

   SLAX

4. D

   Java

5. E

   PHP

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Correct answersA, B, C

Explanation

Junos automation scripts can be written in the following scripting languages: Extensible Stylesheet Language Transformations (XSLT)
Stylesheet Language Alternative syntaX (SLAX)
References:
https://www.juniper.net/documentation/en_US/junos/topics/concept/junos-script-automation-overview.html

Question 6

Single choice

Which messaging protocol do JET service APIs use to interface with the Junos OS?

1. A

   NETCONF

2. B

   MQTT

3. C

   RabbitMQ

4. D

   gRPC

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Correct answerB

Explanation

References:
https://www.juniper.net/documentation/en_US/jet1.0/information-products/pathway-pages/jet-developer-guide.html

Question 7

Single choice

You are asked to write an application that interacts directly with the internal APIs belonging to rpd.

Which statement is true in this scenario?

1. A

   You must write the application using the XML APIs

2. B

   You must write the application using the REST APIs

3. C

   You must write the application using the JET APIs

4. D

   You must write the application using the YANG APIs

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Correct answerC

Question 8

Single choice

Which format does an Ansible playbook use?

1. A

   JSON

2. B

   YAML

3. C

   XML

4. D

   CSV

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Correct answerB

Explanation

References:
https://www.juniper.net/documentation/en_US/junos-ansible1.0/topics/task/program/junos-ansible-playbooks-creating-executing.html

Question 9

Single choice

Click the Exhibit button.
Exhibit:
Junos Event Policy Configuration

Referring to the exhibit.

What will the hostname be if interface ge-0/0/0 goes down?

1. A

   int-test-2

2. B

   int-test-1

3. C

   int-test-4

4. D

   int-test-3

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Correct answerB

Question 10

Single choice

Which statement describes the purpose of Ansible roles?

1. A

   A collection of hosts that have been categorized by purpose

2. B

   A collection of permissions for users of your Ansible setup

3. C

   A collection of tasks to be run on a given set of hosts

4. D

   A collection of Ansible playbooks

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Correct answerC

Explanation

References:
http://docs.ansible.com/ansible/latest/playbooks_reuse_roles.html