Pass the LPI DevOps Tools Engineer 701-100 Questions and answers with CertsForce

REST (Representational State Transfer) is an architectural style for designing networked applications. It relies on a stateless, client-server, cacheable communications protocol -- the HTTP protocol. The main HTTP methods used in REST are:

GET: This method is used to retrieve data from a server at the specified resource.

PUT: This method is used to update or create a resource at the specified URL.

DELETE: This method is used to remove a specified resource.

The other options are not standard HTTP methods used in REST:

CREATE: This is not a standard HTTP method. The equivalent standard method for creating resources is POST.

REPLACE: This is not a standard HTTP method. The equivalent standard methods for replacing resources are PUT or PATCH.

References:

RESTful Web Services - HTTP Methods

MDN Web Docs on HTTP Methods

To execute a command in a running Vagrant box, you typically use vagrant ssh to open an SSH session into the box. Once inside the SSH session, you can run any command as you would on a regular SSH session.

References:

Vagrant Documentation - SSH

The register keyword in an Ansible playbook is used to store the result of a task in a variable. This allows subsequent tasks to use the results of previous tasks.

References: Ansible Documentation - Playbooks

Content Delivery Networks (CDNs) are systems of distributed servers that deliver web content and media to users based on their geographic location. CDNs improve the performance and availability of content delivery.

Streaming Media: CDNs can handle and stream large media files, such as videos and music, efficiently to clients.

Multiple Locations: CDNs have servers in multiple locations around the world to serve content closer to users, reducing latency.

High Bandwidth and Low Latency: CDNs are designed to serve a large number of clients with high bandwidth and low latency, enhancing the user experience.

References:

What is a CDN?

How CDNs Work

The ansible-vault command is used to manage and store sensitive data in encrypted files within Ansible. This allows users to keep variables, passwords, and other confidential information secure by encrypting them in a file.

References: Ansible Documentation - Ansible Vault

A Logstash configuration file is typically divided into three main sections: input, filter, and output. Each section serves a distinct purpose in the data processing pipeline.

input: This section defines where Logstash will collect data from, such as files, syslog, or beats.

filter: This section processes the data collected from inputs. It can include parsing, modification, and enrichment of the data using various filter plugins.

output: This section specifies where the processed data should be sent, such as Elasticsearch, files, or other endpoints.

The other options are incorrect:

D. forward: This is not a standard section in Logstash configuration.

E. generate: This is not a standard section in Logstash configuration.

References:

Logstash Documentation - Configuration

Ansible provides several modules to manipulate the contents of files. The correct modules for changing the contents of a file are:

lineinfile: This module ensures a particular line is present or absent in a file, or it can replace existing lines that match a pattern.

replace: This module performs a search and replace on a string in a file.

patch: This module applies a patch to a file. It can be used to apply diffs to files, which essentially modifies the contents based on the diff provided.

The other options, insert and modify, are not standard Ansible modules for file content manipulation.

References:

Ansible Documentation - lineinfile module

Ansible Documentation - replace module

Ansible Documentation - patch module

Logstash is a powerful data processing pipeline tool that can ingest data from multiple sources, transform it, and then send it to different destinations. Even without other components of the Elastic Stack, Logstash can perform the following tasks:

A. Receive log data from remote systems: Logstash can collect logs from various sources using its numerous input plugins, such as beats, syslog, and HTTP.

D. Process log data to extract information: Logstash can process and transform log data using filter plugins, which allow for parsing, enriching, and modifying the data.

E. Forward log data to other services: Logstash can forward processed data to various outputs, such as databases, message queues, and other log management systems.

The other options are not tasks that Logstash can perform without other components:

B. Store log data persistently: Logstash itself does not provide persistent storage capabilities. It requires Elasticsearch or another storage solution to persist the data.

C. Aggregate log data over a period of time: Aggregation typically requires persistent storage and querying capabilities, which Logstash alone does not provide.

References:

Elastic Documentation - Logstash

The knife command-line tool is used to interact with a Chef server. The knife cookbook list command lists all cookbooks available on the Chef server, allowing users to see which cookbooks are available for use.

References: Chef Documentation - Knife

Ansible playbooks can include conditionals that allow looping over a set of items, sequences, or nested structures.

with_sequence: Iterates over a sequence of numbers.

with_items: Iterates over a list of items.

with_nested: Iterates over a nested list of items, combining them in all possible ways.

References:

Ansible Loops

Ansible Documentation - with_items

Ansible Documentation - with_sequence

Ansible Documentation - with_nested