Q71.

How do you implement WebSockets in Node.js?

Q72.

What is Socket.io?

Q73.

How to implement authentication and authorization in Node.js?

Q74.

What is RBAC in Node.js applications?

Q75.

How do you prevent XSS in Node.js?

Q76.

How do you prevent CSRF in Express?

Q77.

How do you secure REST APIs in production?

Q78.

What is API throttling?

Q79.

What is event-driven architecture?

Q80.

How does Node.js handle DNS resolution?