Juniper Juniper Certifications JN0-420 Questions & Answers

• Question 51:

  With which three processes does the JET service process communicate? (Choose three)

  A. snmpd

  B. ancpd

  C. cosd

  D. mgd

  E. rpd

  Correct Answer: ADE

• Question 52:

  In SLAX, what is the difference between the jcs:invoke () and the jcs:execute () functions?

  A. RPCs called by jcs:execute () are executed within an existing connection

  B. RPCs called by jcs:invoke () are executed within an existing connection

  C. RPCs called by jcs:invoke () are not executed until the conclusion of the script

  D. RPCs called by jcs:execute () are not executed until the conclusion of the script

  Correct Answer: A

• Question 53:

  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

  Correct Answer: BD

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

• Question 54:

  What are three ways for PyEZ to connect to supported Junos devices? (Choose three)

  A. NETCONF over SSH

  B. serial interface

  C. Telnet

  D. JET API

  E. Webhook

  Correct Answer: ABC

  Reference: https://www.juniper.net/documentation/en_US/junos-pyez/topics/task/program/junos-pyezconnection-methods.html

• Question 55:

  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

  Correct Answer: B

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

• Question 56:

  Which statement describes the relationship between YANG and NETCONF?

  A. YANG is the programming language used to generate base classes to develop the NETCONF protocol

  B. NETCONF models XML data used to program YANG modules

  C. YANG models the state and configuration data manipulated by the NETCONF protocol

  D. NETCONF is the programming language used to create the state and configuration data manipulated by YANG

  Correct Answer: C

  Reference: https://tools.ietf.org/html/rfc6020

• Question 57:

  You have created an on-box script and want to deploy it on your device. You plan to place it in a directory

  where the Junos OS can execute it.

  Which two privilege levels would be used to accomplish this task? (Choose two)

  A. read-only

  B. super-user

  C. root

  D. operator

  Correct Answer: BC

  Reference: https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/junos-scriptautomation-script-storing-enabling.html

• Question 58:

  Click the Exhibit button.

  Exhibit:

  Ansible playbook:

  

  The r0 device is currently in a factory-default state. The console connection of r0 is reachable using Telnet

  on TCP port 555 of the console_server host.

  Referring to the exhibit, which statement is true?

  A. The device does not require configuration changes for the playbook to run successfully

  B. The Telnet service must be configured for the playbook to run successfully

  C. A password for the root user must be configured for the playbook to run successfully

  D. The NETCONF service must be configured for the playbook to run successfully

  Correct Answer: D

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

• Question 59:

  Click the Exhibit button. Exhibit:

  

  You are using RubyEZ to interact with a Junos device: however, you are not successfully connecting to the

  device.

  Referring to the exhibit, what is the problem?

  A. Argument passed to Netconf:: SSH.new statement must be referenced as variables

  B. Netconf::SSH.new statement only expects an IP address of the target device

  C. Netconf::SSH.new statement arguments must be hashes

  D. A Junos::Ez::Provider statement is missing before the Netconf::SSH. New statement

  Correct Answer: A

• Question 60:

  Click the Exhibit button. Exhibit:

  

  How would you test the configuration snippet shown in the exhibit?

  A. Use the root@router% logger SSHD_LOGIN_FAILED command

  B. Use the root@router% logger -e SSHD_LOGIN_FAILED command

  C. Use the root@router% test SSHD_LOGIN_FAILED command

  D. Use the root@router% event SSHD_LOGIN_FAILED command

  Correct Answer: B