D522 Python for IT Automation - Set 4 - Part 2

Correct Answer: Encrypted remote command execution and file transfer

SSH provides an encrypted channel for executing remote commands and transferring files, foundational to secure remote automation.

Correct Answer: Programmatically interacting with web services

Scripts use REST APIs to programmatically create, read, update, and delete resources on web services and cloud platforms.

Correct Answer: POST

POST is generally used to create a new resource, while GET retrieves, PUT updates, and DELETE removes.

Correct Answer: GET

GET requests retrieve data from a server and should not change server state.

Correct Answer: Authenticating a script's requests to a service

An API key identifies and authenticates the calling application when it makes requests to a web service.

Correct Answer: A restriction on how many requests can be made in a time period

Rate limiting caps the number of requests a client may make within a window, so automation must handle it, for example by pausing.

Correct Answer: Wait and retry after the specified delay

When rate-limited, a well-behaved script waits (often per a Retry-After header) and retries rather than hammering the service.

Correct Answer: An automated callback triggered by an event on another system

A webhook sends an automatic HTTP callback to a URL when a specified event occurs, enabling event-driven automation.

Correct Answer: A durable record for troubleshooting unattended runs

Persisting logs to a file preserves a durable record of what an unattended script did, essential for diagnosing failures later.

Correct Answer: Storing settings separately from code

A configuration file keeps settings such as paths and options separate from code, so behavior can change without editing the script.

Correct Answer: Settings can change per environment without modifying the script

Externalizing configuration lets the same code run in different environments by swapping settings, improving flexibility and safety.

Correct Answer: Shows what would happen without making changes

A dry-run reports the actions a script would take without actually performing them, letting users verify before committing changes.

Correct Answer: It lets users preview effects and avoid mistakes

A dry-run lets operators confirm that a potentially destructive script will do what they expect before it makes real changes.

Correct Answer: Using functions, clear names, and comments

Breaking code into well-named functions with comments makes automation scripts easier to read, test, and maintain.

Correct Answer: Tracking changes and enabling collaboration and rollback

Version control records the history of script changes, supporting collaboration, review, and rollback to earlier versions.

Correct Answer: To prevent errors and unsafe operations from bad data

Validating inputs guards against malformed or malicious data that could cause errors or unsafe actions in an unattended script.

Correct Answer: It crashes if the file is missing

Assuming a resource exists leads to crashes when it does not; robust scripts check existence and handle the absence gracefully.

Correct Answer: Recursively deletes a directory and its contents

shutil.rmtree() removes an entire directory tree, so it must be used carefully in automation to avoid deleting the wrong data.

Correct Answer: To catch mistakes before they affect real systems

Testing in a non-production environment reveals errors and unintended effects before the script can damage real systems or data.

Correct Answer: Parsing and summarizing large logs to find issues

Python scripts parse and aggregate large log files to extract patterns, errors, and metrics far faster than manual review.