Juniper JN0-420 Online Practice Questions and Exam Preparation

Juniper JN0-420 Online Questions & Answers

• Question 1:

  Click the Exhibit button. Exhibit:

  

  Referring to the exhibit, which Python statement selects the element for the user logged in on the pts/2 TTY?

  A. response.find("./uptime-information/user-table/user-entry/tty='pts/2'")
  B. response.find("./uptime-information/user-table/[tty='pts/2']/user-entry")
  C. response.find("../user-entry/[tty='pts/2']")
  D. response.find("./uptime-information/user-table/user-entry@tty='pts/2'")
  B. response.find("./uptime-information/user-table/[tty='pts/2']/user-entry")

• Question 2:

  What is the purpose of an __init__.py file?

  A. An __init__.py file initializes a Python application with default values for instantiated objects
  B. An __init__.py file indicates to the Python interpreter that a directory contains Python packages or modules
  C. __init__.py file sets all magic attributes with the __init__.prefix with the appropriate default values
  D. An __init__.py file contains strings for additional directories that the Python interpreter adds to sys.path []
  B. An __init__.py file indicates to the Python interpreter that a directory contains Python packages or modules

• Question 3:

  Click the Exhibit button. Exhibit:

  

  Referring to the exhibit, the configuration components are displayed in which format?

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

• Question 4:

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

  A. YANG modules
  B. XML APIs
  C. control plane
  D. forwarding plane
  C. control plane

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

• Question 5:

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

  A. NETCONF
  B. MQTT
  C. RabbitMQ
  D. gRPC
  B. MQTT

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

• Question 6:

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

  A. snmpd
  B. ancpd
  C. cosd
  D. mgd
  E. rpd
  A. snmpd
  D. mgd
  E. rpd

• Question 7:

  Which statement describes the purpose of Ansible roles?

  A. A collection of hosts that have been categorized by purpose
  B. A collection of permissions for users of your Ansible setup
  C. A collection of tasks to be run on a given set of hosts
  D. A collection of Ansible playbooks
  C. A collection of tasks to be run on a given set of hosts

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

• Question 8:

  Which transport protocol must be supported by RFC-compliant NETCONF implementations?

  A. TLS
  B. Telnet
  C. BEEP
  D. SSH
  D. SSH

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  The NETCONF protocol uses a simple remote procedure call (RPC) layer running over secure transports to facilitate communication between a client and a server. The Secure Shell (SSH) [6] is the mandatory secure transport that all NETCONF clients and servers are required to implement as a means of promoting interoperability. Reference: https://link.springer.com/content/pdf/10.1007/978-3-642-02627-0_7.pdf

• Question 9:

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

  A. Transport
  B. Content
  C. Messages
  D. Operations
  A. Transport

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  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 10:

  In a Python commit script, which object provides the post-inheritance candidate configuration?

  A. Commit-Script-Input
  B. Junos_Configuration
  C. Candidate_Configuration
  D. Checkout_Configuration
  B. Junos_Configuration

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  Python automation scripts import the Junos_Context dictionary when the script must access information about the script execution environment. The Junos_Configuration object is required when the commit script must read and manipulate the post-inheritance candidate configuration. Reference: https://www.juniper.net/documentation/en_US/junos/topics/reference/general/junos-script-automation-boilerplate-commit-scripts.html