Juniper JN0-420 Certification Exam Sample Questions and Answers

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Juniper JN0-420 (JNCIS-DevOps) Sample Questions:

01. To which component(s) does the JET service APIs provide access?
a) XML APIs
b) YANG modules
c) forwarding plane
d) control plane
 
02. What is a correctly formatted JSON string?
a) ‘ { “foo”: (“a”, “b”, “c”), “bar”: {1, 2, 3} }’
b) ‘ [ “foo”: (“a”, “b”, “c”), “bar”: [1, 2, 3] ]’
c) ‘ { “foo”: (“a”, “b”, “c”), “bar”: (1, 2, 3) }’
d) ‘ { “foo”: (“a”, “b”, “c”), “bar”: [1, 2, 3] }’
 
03. Which transport protocol must be supported by RFC-compliant NETCONF implementations?
a) Telnet
b) SSH
c) TLS
d) BEEP
 
04. By default, Python event scripts and SNMP script configured on a Junos device execute as which user?
a) snmpd
b) wheel
c) root
d) nobody
 
05. You want to push a configuration onto a Junos device without using NETCONF. Which two will accomplish this task?
(Choose two.)
a) JET
b) JSNAPy
c) Ansible
d) ZTP
 
06. 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.
 
07. What are two benefits of network automation?
(Choose two )
a) to enforce consistency in automated devices
b) increase programming language fluency
c) to provide historical configuration management
d) to improve product lifecycle management
 
08. 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 Junson OS can execute it. Which two privilege levels would be used to accomplish this task?
a) super-user
b) read-only
c) operator
d) root
 
09. A customer has a control machine with a default Ansible installation. During execution of an Ansible module, the Ansible control machine generates the no hosts matched error. Which statement is correct in this scenario?
a) The target device was not defined in /etc/ansible/hosts on the control machine.
b) The target device was not defined in /etc/ansible/invertory/hosts on the control machine.
c) The target device was not defined in /etc/hosts on the control machine.
d) The target device was not defined on the associated DNS servers.
 
10. Which command is valid for assessing a Junos device using the RESTful API on the default port?
c) curl - u “user:pass123” http://192.168.1.1:80/rpc/get-interface-information?interface-name=lo0

Solutions:

Question: 01

Answer: d

Question: 02

Answer: c

Question: 03

Answer: b

Question: 04

Answer: d

Question: 05

Answer: a, d

Question: 06

Answer: a

Question: 07

Answer: a, d

Question: 08

Answer: a, d

Question: 09

Answer: a

Question: 10

Answer: b

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