Microservice transports in NestJS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a microservice transport in the context of NestJS?

A microservice transport is the communication method used by microservices to send and receive messages. In NestJS, transports define how microservices connect and exchange data, such as TCP, Redis, or MQTT.

beginner

Name three common transport layers supported by NestJS microservices.

TCP, Redis, and MQTT are three common transport layers supported by NestJS for microservice communication.

intermediate

Why is TCP transport often used for microservices in NestJS?

TCP transport is used because it provides a reliable, fast, and simple connection-oriented communication channel between microservices, suitable for many internal service calls.

intermediate

How does Redis transport help in microservice communication?

Redis transport uses Redis Pub/Sub to enable asynchronous message passing between microservices, which helps decouple services and supports event-driven architectures.

advanced

What is the main advantage of using MQTT transport in NestJS microservices?

MQTT transport is lightweight and designed for unreliable networks, making it ideal for IoT or mobile microservices that need efficient, low-bandwidth communication.

Which NestJS transport uses a publish-subscribe model for messaging?

A Redis

B TCP

C gRPC

D HTTP

Redis transport uses the publish-subscribe model to send messages asynchronously between microservices.

What type of communication does TCP transport provide in NestJS microservices?

A Multicast only

B Connectionless and unreliable

C Broadcast only

D Connection-oriented and reliable

TCP transport provides a connection-oriented and reliable communication channel.

Which transport is best suited for IoT devices in NestJS microservices?

A Redis

B TCP

C MQTT

D HTTP

MQTT is lightweight and designed for unreliable networks, ideal for IoT devices.

In NestJS, which transport layer supports asynchronous event-driven communication?

A Redis

B TCP

C WebSocket

D HTTP

Redis transport supports asynchronous event-driven communication using Pub/Sub.

Which of the following is NOT a built-in NestJS microservice transport?

A TCP

B HTTP

C Redis

D MQTT

HTTP is not a built-in transport in NestJS; it requires custom implementation or third-party packages.

Explain the differences between TCP, Redis, and MQTT transports in NestJS microservices.

Think about how each transport handles message delivery and network conditions.

Describe a real-life scenario where you would choose Redis transport over TCP in a NestJS microservice architecture.

Consider when services should not wait for immediate responses.