[2020.6] Tips for successfully passing the Juniper JN0-420 exam
How do I successfully pass the Juniper JNCIS JN0-420 exam?
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[PDF Q1-Q13] Free Juniper JN0-420 pdf dumps download from Google Drive: https://drive.google.com/file/d/1Gm50IE7BsIFZY7MGmW-74OwxAtgxEkCO/
JNCIS-DevOps Exam Objectives (Exam: JN0-420)： https://www.juniper.net/uk/en/training/certification/resources/jncis-devops/#gsc.tab=0
Latest Updates Juniper JN0-420 Exam Practice Questions and Answers
QUESTION 1
What are two message types that compose the message layer of the Juniper NETCONF implementation? (Choose
two?)
A.
B.
C.
D.
Correct Answer: CD
QUESTION 2
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
QUESTION 3
Your organization is creating a custom YANG module. You are asked to create a leaf node called timeout with a data
type of duration. In this scenario, what is the appropriate syntax for this leaf node?
A. Option A
B. Option B
C. Option C
D. Option D
Correct Answer: D
QUESTION 4
Which messaging protocol do JET service APIs use to interface with the Junos OS?
A. NETCONF
B. MQTT
C. RabbitMQ
D. gRPC
Correct Answer: B
QUESTION 5
By default, Python event scripts and SNMP scripts configured on a Junos device execute as which user?
A. wheel
B. snmpd
C. nobody
D. root
Correct Answer: C
QUESTION 6
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-key-based authentication with
a
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 7
Click the Exhibit button. Exhibit:
An automation developer is using command-line scripting and wants to briefly survey NETCONF capabilities before
running a new task. Referring to the exhibit, how does the automation developer end the current NETCONF session and
go to the next one?
A. Use the command.
B. Use the quit command
C. Use the logout command
D. Use the command.
Correct Answer: D
QUESTION 8
Click the Exhibit button. Exhibit: You need to programmatically extract interface information using PyEZ from your MX
Series devise. You log in and use the show interfaces terse | display XML RPC command and see the information shown
in the exhibit. What is the correct PyEZ syntax to accomplish this task?
A. dev.rpc.get-interface-information()
B. dev.rpc.get_interface_information(terse=True)
C. dev.rpc.get-interface-information(terse=True)
D. dev.rpc.get_interface_information()
Correct Answer: B
QUESTION 9
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 10
Click the Exhibit button. Exhibit:
Referring to the exhibit, how would you solve this issue?
A. Enable trace options under the NETCONF configuration hierarchy
B. Enable protocol-version v1 under the SSH configuration hierarchy
C. Enable outbound-ssh with services netconf under the SSH configuration hierarchy
D. Enable ssh under the NETCONF configuration hierarchy
Correct Answer: C
Reference: https://www.juniper.net/documentation/en_US/junos/topics/topic-map/netconf-ssh-connection.html
QUESTION 11
What are two format distinctions to know when using YAML? (Choose two)
A. white space indentation sensitive
B. tab indentation not allowed
C. tab indentation allowed
D. white space indentation insensitive
Correct Answer: AB
Because YAML is white-space sensitive and indentation is significant (not allowed), you should always use spaces
rather than tabs when creating playbooks. In YAML, items preceded by a hyphen (-) are considered list items, and the
key: value notation represents a hash. Reference: https://www.juniper.net/documentation/en_US/junosansible1.0/topics/task/program/junos-ansible-playbooks-creating-executing.html
QUESTION 12
A customer has a control machine with a default Ansible installation. During the execution of an Ansible module against a
Junos devise, the Ansible control machine generates the msg: unable to connect to router1.example.com:
ConnectRefusedError (router1.example.com) error.
What is the cause of 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
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