Juniper JN0-420 Online Practice Questions and Exam Preparation

Juniper JN0-420 Online Questions & Answers

• Question 41:

  A customer has a control machine with a default Ansible installation. During execution of an Ansible module against a Junos device, the Ansible control machine generates the msg: unable to connect to router1.example.com:

  ConnectRefusedError (router1.example.com) error.

  What is the cause for this error?

  A. router1.example.com was not defined in /etc/hosts on the control machine
  B. Ansible cannot connect to the device through NETCONF
  C. router1.example.com was not defined in /etc/ansible/inventory/hosts on the control machine
  D. Ansible cannot authenticate to the device
  B. Ansible cannot connect to the device through NETCONF

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  Reference: https://www.juniper.net/documentation/en_US/junos-ansible1.0/information-products/pathway-pages/junos-ansible.pdf

• Question 42:

  Click the Exhibit button. Exhibit:

  

  Referring to the exhibit, what is the execution order of tasks in the Ansible playbook?

  A. Task A > Task B
  B. Task A > Task B > Task C
  C. Task C > Task B
  D. Task C > Task B > Task A
  A. Task A > Task B

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  Reference: http://docs.ansible.com/ansible/latest/playbooks_intro.html

• Question 43:

  What are three elements of a JET notification message? (Choose three)

  A. time
  B. severity
  C. username
  D. subscription type
  E. hostname
  A. time
  B. severity
  E. hostname

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  JET notification is delivered in JSON format. The JSON message has two parts, one the header, and other the event-information portion, called attributes. The header is common for all events. It contains the event ID, hostname, time,

  severity, and facility of the event. The attributes vary depending event's topic name.

  Reference: https://www.juniper.net/documentation/en_US/jet1.0/topics/concept/jet-notification-api-overview.html

• Question 44:

  Which data serialization method does the Junos CLI use to communicate with the Junos management process (mgd)?

  A. JSON
  B. gRPC
  C. XML
  D. YAML
  C. XML

• Question 45:

  What are two benefits of network automation? (Choose two)

  A. to enforce consistency in automated devices
  B. to increase programming language fluency
  C. to provide historical configuration management
  D. to improve product lifecycle management
  A. to enforce consistency in automated devices
  D. to improve product lifecycle management

• Question 46:

  Which YAML document represents a valid mapping (dictionary) of sequences (lists)?

  

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  D. Option D

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  Reference: https://github.com/Animosity/CraftIRC/wiki/Complete-idiot%27s-introduction-to-yaml

• Question 47:

  Which two primary processes are used by Juniper devices for on-box or off-box automation? (Choose two)

  A. mgd
  B. ancpd
  C. jsd
  D. rpd
  B. ancpd
  C. jsd

• Question 48:

  Which format does an Ansible playbook use?

  A. JSON
  B. YAML
  C. XML
  D. CSV
  B. YAML

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

• Question 49:

  What are three types of Juniper on-box scripts? (Choose three)

  A. operational
  B. expect
  C. Ansible
  D. event
  E. commit
  A. operational
  D. event
  E. commit

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  Reference: "Network-Embedded Management and Applications" section 6.2.1

• Question 50:

  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)

  A. set system scripts op allow-url-for-python
  B. set system scripts op file inventory.py
  C. set system scripts op no-allow-url
  D. set system scripts language python
  B. set system scripts op file inventory.py
  D. set system scripts language python

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