DL Advanced and Specialized Skills 4

Question 1

A web developer needs to make a website accessible to users with screen readers. Which HTML attribute provides descriptive text for images?

Accepted Answer

alt

Answer

The `alt` attribute provides alternative text for images, which screen readers announce to visually impaired users.

Question 2

Which data format is most commonly used for exchanging structured data between a web API and client applications?

Accepted Answer

JSON

Answer

JSON (JavaScript Object Notation) is lightweight, human-readable, and the de facto standard for web API data exchange.

Question 3

A system administrator needs to automate server configuration across hundreds of machines consistently. Which category of tool is designed for this?

Accepted Answer

Configuration management tools like Ansible or Puppet

Answer

Configuration management tools like Ansible and Puppet automate the provisioning and consistent configuration of large numbers of servers.

Question 4

In cloud computing, what does 'elasticity' refer to?

Accepted Answer

The ability to automatically scale resources up or down based on demand

Answer

Elasticity in cloud computing means resources can be automatically provisioned and released in response to fluctuating workload demands.

Question 5

A developer writes a SQL query with a subquery in the WHERE clause that references the outer query's table. What is this called?

Accepted Answer

A correlated subquery

Answer

A correlated subquery references columns from the outer query and is re-evaluated for each row processed by the outer query.

(DL) Digital Literacy Certification Practice Test