Juniper Juniper Certifications JN0-420 Questions & Answers

• Question 41:

  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

  Correct Answer: BC

• Question 42:

  To which component(s) does the JET service APIs provide access?

  A. YANG modules

  B. XML APIs

  C. control plane

  D. forwarding plane

  Correct Answer: C

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

• Question 43:

  Which command is used to execute an Ansible playbook?

  A. ansible-vault

  B. ansible

  C. ansible-galaxy

  D. ansible-playbook

  Correct Answer: D

  Reference: https://docs.ansible.com/ansible/2.4/command_line_tools.html

• Question 44:

  What are two attributes of the jsd JET service process? (Choose two)

  A. It executes one API request per session

  B. It executes APIs from multiple sessions in parallel

  C. It supports only one client session at a time

  D. It creates a separate thread to service JET application requests

  Correct Answer: BD

  To support application interaction with Junos OS, the JETservice process (jsd), by default, uses TCP port 32767 to listen for and receive requests from applications to execute APIs. Whenever a request comes on the TCP port, jsd creates a separate thread to service the JET application request. The session remains established as long as the client and server are both up and able to communicate with each other. Over the lifetime of a session, jsd can execute many APIs, and it can execute APIs from multiple sessions in parallel. You can have a maximum of 8 active client sessions connected at any given time. Reference: https://www.juniper.net/documentation/en_US/junos/information-products/pathway-pages/config-guide-jetapplications/jet-apps-administration-guide-jet.pdf

• Question 45:

  Click the Exhibit button. Exhibit:

  

  The Ansible playbook shown in the exhibit is executed against a set of Junos network devices. Each Junos

  device is configured with a user account in the super-user login class. The user account uses SSH-keybased authentication with a passphrase of user123.

  What is the result of executing this playbook against the Junos network devices?

  A. The playbook executes, but fails with a "ConnectAuthError" due to the missing passphrase argument to the junos_get_facts module

  B. The playbook fails due to a YAML syntax error.

  C. The playbook executes and prints the version of Junos running on each network device as the value of response.facts.version

  D. The playbook executes and prints "VARIABLE IS NOT DEFINED!" as the value response.facts.version

  Correct Answer: C

• Question 46:

  Which statement is true about a Junos ephemeral configuration database?

  A. It can be used to trigger a commit script

  B. It can be used to reduce commit time

  C. It can be used to archive previous versions of the ephemeral configuration

  D. It can be used to validate configuration data semantics

  Correct Answer: B

  Reference: https://www.juniper.net/documentation/en_US/junos/topics/concept/ephemeral-configurationdatabase-overview.html

• Question 47:

  Which two automation frameworks are agentless when managing Junos devices? (Choose two)

  A. SaltStack

  B. Ansible

  C. Puppet

  D. Chef

  Correct Answer: AB

• Question 48:

  Click the Exhibit button. Exhibit:

  

  

  

  Referring to the exhibit, what is the type of the myConfig variable on line 17 of the Python script?

  A. template

  B. dictionary

  C. string

  D. list

  Correct Answer: A

  Reference: https://www.juniper.net/documentation/en_US/cso3.1/topics/task/operational/cd-configtemplate-working-config-designing.html

• Question 49:

  The XML tag is a member of which NETCONF protocol layer?

  A. Transport

  B. Content

  C. Messages D. Operations

  Correct Answer: A

  The NETCONF protocol uses an RPC-based communication model. NETCONF peers use and elements to provide transport-protocol-independent framing of NETCONF requests and responses. Reference: https://tools.ietf.org/html/rfc6241

• Question 50:

  You are asked by your manager to automatically switch traffic from the primary link to the backup link on the MX Series device at the branch site whenever latency is above 300 ms over a 5-minute period. Which type of Junos script would you use in this scenario?

  A. Op

  B. SNMP

  C. Commit

  D. Event

  Correct Answer: D

  Reference: https://www.juniper.net/documentation/en_US/junos/topics/concept/junos-script-automationoverview.html