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WebSockets interview questions

WebSockets interview questions.

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1.

What is WebSockets?

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2.

Why use WebSocket over Http?

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What do you mean by lower latency interaction?

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What is Short polling and what problems do we have with it?

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Explain what is Server-Sent Events (SSE) / EventSource?

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Name and explain what different communication techniques on the web do you know?

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What is the difference between WebSockets vs. Server-Sent events/EventSource?

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8.

Explain key features of Socket.io

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Mention some advantages of SSE over Websockets

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10.

Explain what is Long Polling?

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11.

WebSockets vs Rest API for real time data? Which to choose?

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When to use WebRTC over WebSockets?

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What is Sec-WebSocket-Key for?

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What are the differences between Socket.io and WebSockets?

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Why would you choose Server-Sent Events over WebSockets?

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16.

Explain how does WebSockets protocol work under the hood

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17.

What is WebSockets Frame?

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Would WebSockets be able to handle 1,000,000 concurrent connections?

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19.

Can you suggest how to load balance Web Sockets?

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20.

How would you secure WebSockets communication on your project?

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21.

What is the mask in a WebSocket frame?

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22.

What is the fundamental difference between WebSockets and pure TCP?

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23.

Explain why CDN (in)availability may be a problem for using WebSockets?

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How to use CHAP Authentication (Challenge Response Authentication) for webSockets?

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How can WebSockets be better than Long-Polling in term of performance?

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