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Juniper Automation and DevOps, Associate (JNCIA-DevOps) Sample Questions (Q17-Q22):

NEW QUESTION # 17
Which Junos configuration database is updated by PyEZ by default?

A. shared
B. dynamic
C. ephemeral
D. private

Answer: D

Explanation:
An event script is used to automate responses to system events in Junos, such as an interface going down. These scripts are triggered automatically when a specified event occurs, making them suitable for tasks like monitoring interface status and executing actions when the status changes.
Option B (event) is correct because event scripts are designed for reacting to system events like an interface going down.
Option A (commit) is used for configuration changes, Option C (operation) is used for operational tasks, and Option D (SNMP) is not applicable in this context.
Supporting Reference:
Juniper Networks Event Scripts Documentation: Details how event scripts are used to automate responses to specific system events in Junos

NEW QUESTION # 18
You want to perform a dry run on the myPlays playbook and use a custom inventory file called myRouters.ini.
Which Ansible command would you use in this scenario?

A. ansible-playbook myPlays --check -i myRouters.ini
B. ansible-playbook myPlays -extra-vars "inventory_file=myRouters .ini"
C. ansible-playbook myPlays -extra-vars "dry run=True" myRouters.ini
D. ansible-playbook myPlays -limit myRouters

Answer: B

NEW QUESTION # 19
What is the difference between a list and a tuple in Python?

A. Lists are mutable objects that use parentheses, and tuples are immutable objects that use square brackets.
B. Lists are immutable objects that use parentheses, and tuples are immutable objects that use square brackets.
C. Lists are mutable objects that use square brackets, and tuples are immutable objects that use parentheses.
D. Lists are immutable objects that use square brackets, and tuples are mutable objects that use parentheses.

Answer: C

Explanation:
In Python, the distinction between lists and tuples is essential for efficient programming:
Lists:
Mutable (B): This means that once a list is created, its elements can be changed, added, or removed. Lists are versatile and commonly used when the data is expected to change.
Square Brackets: Lists are defined using square brackets [].
Example:
my_list = [1, 2, 3]
my_list[0] = 10 # Modifying the first element
Tuples:
Immutable (B): Once a tuple is created, it cannot be altered. Tuples are used when a fixed collection of items is needed, providing more integrity to the data.
Parentheses: Tuples are defined using parentheses ().
Example:
my_tuple = (1, 2, 3)
# my_tuple[0] = 10 # This would raise an error because tuples are immutable Reference:
Python Official Documentation: The Python Language Reference provides detailed information on data types like lists and tuples, including their mutability and syntax.
Automation Scripts: In the context of automation, understanding when to use mutable or immutable data structures can significantly impact script performance and reliability.

NEW QUESTION # 20
Using the set rest control configuration command, what are two ways to control access to the REST API running on a Junos device? (Choose two.)

A. Limit access to only certain source IP addresses
B. Limit management access to specific users.
C. Limit the number of simultaneous connections.
D. Limit management access to only SSH

Answer: A,C

Explanation:
When using the set rest control configuration command on a Junos device, you have several options to control access to the REST API. Two effective methods include:
Limiting the number of simultaneous connections: This ensures that the REST API is not overwhelmed by too many concurrent requests, which could potentially lead to performance issues or denial of service.
Limiting access to certain source IP addresses: This method restricts API access to specific IP addresses, enhancing security by ensuring that only trusted sources can interact with the REST API.
Option A (Limit management access to only SSH) is unrelated to controlling REST API access specifically.
Option B (Limit management access to specific users) might be relevant in a different context, but it is not directly tied to REST API control via the specific command mentioned.
Supporting Reference:
Juniper Networks REST API Documentation: This documentation explains how to configure and control access to the REST API on Junos devices, including connection limits and IP-based access control.

NEW QUESTION # 21
Which two statements about NETCONF are true? (Choose two.)

A. It uses the messages layer to lock the configuration of a Junos device.
B. It uses the operations layer to commit the configuration of a Junos device.
C. It uses the messages layer to commit the configuration of a Junos device.
D. It uses the operations layer to lock the configuration of a Junos device.

Answer: B,D

Explanation:
NETCONF (Network Configuration Protocol) operates through different layers, with the operations layer being particularly important for managing configurations:
Operations Layer (A & D): This layer is responsible for actions like locking and committing the configuration on a Junos device. The lock operation prevents other sessions from modifying the configuration, and the commit operation applies the configuration changes to the device.
Options B and C are incorrect because the messages layer handles the communication aspects, such as exchanging data between the client and server, not performing configuration operations like locking and committing.
Reference:
IETF RFC 6241 (NETCONF): Describes the protocol layers and their functions, with a focus on the operations layer.
Juniper Networks NETCONF Documentation: Provides insights into how NETCONF operations are managed in Junos

NEW QUESTION # 22
......

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