QUESTION: 9

Which DevOps "Three way" principle addresses technical debt?

feedback
flow
continuous experimentation and learning
continuous experimentation

Answer(s): B

Explanation:

The "Three Ways" in DevOps represent key principles for achieving continuous delivery and improvement. They are:

Flow (First Way): This principle focuses on creating a fast flow of work from development to operations, reducing delays, and minimizing handoffs. It addresses technical debt by emphasizing the importance of reducing complexity, minimizing work-in-progress (WIP), and ensuring that code and infrastructure are simple and maintainable.

Feedback (Second Way): This involves creating a feedback loop that allows teams to detect and correct issues quickly.

Continuous Experimentation and Learning (Third Way): Encourages a culture of continuous experimentation, learning from failures, and innovation.

The Flow principle specifically addresses technical debt by promoting practices that prevent the accumulation of unnecessary complexity and encouraging early detection and resolution of problems, thus ensuring that the codebase and infrastructure remain maintainable and scalable.

Supporting

Reference:

"The Phoenix Project" by Gene Kim, Kevin Behr, and George Spafford: A foundational text in DevOps literature, explaining the Three Ways and how they relate to improving IT and software development processes.

"The DevOps Handbook" by Gene Kim et al.: Expands on the Three Ways, particularly the importance of flow in preventing technical debt and ensuring a smooth deployment pipeline.

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QUESTION: 10

Which two processes are used by Junos automation? (Choose two.)

mod
jsd
ifd
kmd

Answer(s): B,C

Explanation:

In Junos OS, automation processes are integral to the system's ability to manage network operations efficiently. The following processes are used by Junos automation:

jsd (Junos XML API Server Daemon): This process is crucial for handling XML API requests, which are essential for automation tasks. The jsd process manages interactions between the Junos XML API and the Junos OS, enabling automation scripts to query and configure network devices using XML- formatted commands.

ifd (Interface Daemon): While ifd is primarily responsible for managing network interfaces, it is involved in automation through its role in the operational state of the network. Automation scripts often need to interact with network interfaces to retrieve status information or modify configurations, making ifd a critical component.

Other options like mod and kmd are not directly related to the primary automation processes in Junos OS. mod is related to chassis management, and kmd handles security services.

Reference:

Juniper Networks Automation and DevOps Documentation: Provides detailed descriptions of processes like jsd and ifd and their roles in Junos OS.

Junos OS Daemons Documentation: Outlines the purpose and functionality of various daemons, including jsd and ifd.

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QUESTION: 11

Which two statements are valid regarding Junos automation? (Choose two.)

The jsd process handles XML API calls.
The mgd process handles JET API requests.
The jsd process handles JET API requests.
The mod process handles XML API calls.

Answer(s): A,C

Explanation:

In Junos automation, several processes handle API requests, and understanding which process handles what is crucial:

jsd Process:

XML API Calls (A): The jsd process is responsible for handling XML API calls, which are a significant part of Junos automation. XML API allows for structured and standardized communication with Junos devices, enabling automation scripts to query and configure devices.

JET API Requests (C): The jsd process also handles JET (Junos Extension Toolkit) API requests. JET provides a more modern, programmable interface for interacting with Junos OS, and jsd is the process that manages these interactions.

mgd Process (Incorrect Option):

Not for JET API Requests: The mgd process handles general management operations, such as CLI commands and managing the configuration database, but it does not handle JET API requests. That role is fulfilled by jsd.

mod Process (Incorrect Option):

Not for XML API Calls: The mod process deals with managing chassis components and is not involved in handling XML API calls.

Reference:

Juniper Networks JET and XML API Documentation: Describes the roles of jsd in handling both XML and JET API requests.

Junos Automation and DevOps Documentation: Provides insights into how different processes interact with Junos APIs.

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QUESTION: 12

Tuples are defined using parentheses ()

Lists are immutable objects that use square brackets, and tuples are mutable objects that use parentheses.
Lists are mutable objects that use square brackets, and tuples are immutable objects that use parentheses.
Lists are immutable objects that use parentheses, and tuples are immutable objects that use square brackets.
Lists are mutable objects that use parentheses, and tuples are immutable objects that use square brackets.

Answer(s): B

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.

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QUESTION: 9

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QUESTION: 10

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QUESTION: 11

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QUESTION: 12

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