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DDoS Protection & Rate Limiting Abuse Cases

One-liner: A DDoS (Distributed Denial of Service) attack overwhelms your system with fake traffic until real users can't get through. Defense is layered — no single solution works alone.

  • Three main defense layers: internet, WAF, and application.
  • Implement rate limiting per user/API key with CAPTCHA and IP blocking.
  • Use bot detection tools like Cloudflare Bot Management and reCAPTCHA v3.

Common AWS Free Tier Mistakes Beginners Make

The AWS Free Tier is one of the best ways to start learning cloud infrastructure, but many beginners misunderstand how it actually works.

  • AWS Free Tier has usage limits and service restrictions
  • Continuous resource operation can lead to unexpected charges
  • Free Tier limits differ by service, crucial to review before deployment

Day 1 — ইন্টারনেট আসলে কীভাবে কাজ করে

আকাশ নামের এক ছেলের কাছে একটা ফোন এলো। ওপাশ থেকে একজন খুব সিরিয়াস গলায় বলল, "আমাদের ব্যাংকের server maintain করা হচ্ছে। আপনার অ্যাকাউন্টে একটু সমস্যা হয়েছে। এখনই ঠিক না করলে অ্যাকাউন্ট freeze হয়ে…

  • Internet is a network of interconnected computers and devices
  • Originated from ARPANET, developed for classified data sharing
  • TCP/IP protocols facilitate data transfer between computers

OpenBSD Stories: Strange Medieval Devices

The Problem & Industry Shift The OpenBSD project is renowned for its security focus, but its hardware support philosophy is equally distinctive: it actively supports a vast array of obscure and obsolete devices, some of which feel like relics from a medieval technological era.

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