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VPN cheat sheet & developer notes

VPN cheat sheet and 2 curated developer notes — core concepts, patterns, and interview prep. Maintained by the DevRecall team.

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01 · VPN

Limitations, Tradeoffs & the Zero-Trust Shift

Limitations, Tradeoffs & the Zero-Trust Shift. What a VPN Doesn't Protect Against. A VPN encrypts traffic in transit and masks apparent origin — it doesn't protect against malware already on a device, phishing that trick…

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02 · VPN

Tunneling, Encryption & VPN Use Cases

Tunneling, Encryption & VPN Use Cases. Tunneling + Encryption. A VPN creates an encrypted tunnel across a public network like the internet — tunneling encapsulates one protocol's packets inside another so data traverses …

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TypeScriptgeneral

Interview Questions

TypeScript Interview Questions. Comprehensive TypeScript interview questions covering type system, generics, utility types, and best practices:. Fundamentals. 1. What is TypeScript?. TypeScript is a…

Mar 28, 2026

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TypeScriptgeneral

Advanced Types (Generics & Utility Types)

TypeScript Advanced Types. Generics. // Generic function function identity<T>(arg: T): T { return arg; } const num = identity<number>(42); // Explicit const str = identity('hello'); // Inferred //…

Mar 3, 2026

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