তথ্যপ্রযুক্তি শিখি - উন্নত স্তর

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The Beginner book built the everyday vocabulary of computing. This Advanced book asks a harder question: when a system appears to work, what exactly have you proved? It works through operating systems, networks, data and controlled service design, with careful models, explicit assumptions and reproducible tests. All explanations are in Bengali. This 77-page guide runs through 18 units: measuring the bottleneck before buying speed; processes, waiting and shared state; representation, encoding and error detection; stored files and recovery boundaries; identity, least privilege and permission reviews; IPv4 prefixes with headroom; DNS, DHCP and cached answers; reliable streams and datagrams; HTTP, TLS and cache decisions; relational modelling before writing queries; constraints, transactions and a failed second loan; consistent backup and a measured restore drill; virtual machines, containers and boundaries; repeatable configuration and reversible change; metrics that preserve the user's experience; threats, controls and a risk statement with an owner; accessible output as a task outcome; and a final unit that integrates everything into a fictional school-library model. Every unit gives a concept page, a worked case with a safe lab plan, and explained assessment with an extension challenge. An optional code appendix uses basic Python and SQLite in a fresh disposable environment. No lab needs real credentials, public network traffic or live service changes. Sources were checked in November 2026; primary specifications support the protocol concepts, and general US security guidance is given as technical context, not Indian legal advice. Product interfaces, support and cloud terms need current checks before real action. Best suited to readers who have finished the Beginner book and are comfortable with ordinary files and applications. Programming is optional for the paper route. The Professional book continues into running and making decisions about real services. Impo