What’s the difference between a FIFO and a standard queue?

Standard queues provide at-least-once delivery, which means that each message is delivered at least once. FIFO queues provide exactly-once processing, which means that each message is delivered once and remains available until a consumer processes it and deletes it.

How can the server be assured a message was properly received?

What classic design pattern is best represented by event driven programming?

Design patterns are programming language independent strategies for solving a common problem. That means a design pattern represents an idea, not a particular implementation. By using design patterns, you can make your code more flexible, reusable, and maintainable. Design patterns are meant for common problem-solving

How do you test an event driven system?

Basically, an event-driven application architecture is one in which services (aka functions) within an application input data and output data via messages that are stored in a message queue. This differs from a synchronous architecture, in which data is passed straight to a service by making a direct call

Term	Definition
FIFO Queue	A FIFO queue is a queue that operates on a first-in, first-out (FIFO) principle. This means that the request (like a customer in a store or a print job sent to a printer) is processed in the order in which it arrives
Pub/Sub	Pub/Sub enables you to create systems of event producers and consumers, called publishers and subscribers. Publishers communicate with subscribers asynchronously by broadcasting events, rather than by synchronous remote procedure calls (RPCs).