Module 11 · 1 chapters

Advanced Networking

Advanced networking goes beyond fetch() — SDE-2 interviews expect you to explain HTTP/2 multiplexing, why HTTP/3 uses QUIC over UDP, the TCP 3-way handshake, DNS resolution flow, and when to pick WebSockets vs SSE.

This module covers protocol comparisons, TLS handshakes, CDN architecture, load balancing strategies, real-time communication patterns, and Service Worker offline caching.

From typing a URL to receiving a response, you will trace DNS resolution, TCP/TLS handshakes, HTTP caching headers, and when to choose WebSockets, SSE, or long-polling for live data.

Deep dives include HTTP methods, Cache-Control and ETag, CDN benefits, CORS preflight, PUT vs PATCH, symmetric vs asymmetric encryption, and the full browser-to-server request lifecycle.

Chapters in this module

  1. Advanced NetworkingAdvanced networking for frontend engineers: HTTP methods, caching headers, CDN, CORS, TLS, DNS prefetching, Long-Polling vs WebSockets vs SSE, and the full journey from typing a URL to page load.
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