IT explained, sources included.
Hardware, networks and software in plain language. Every page lists its sources and the date it was last checked. The library is still growing: right now every page is a foundation draft, and each one says so.
8 of 25 entries
- entries, each in English and German
- 25
- source citations in total
- 228
Something to dip into
A few pages to start with. The search above covers every entry, in English and German.
CPU / processor
The central processing unit executes machine instructions; cores, clock rate, architecture and power limits describe different properties.
Memory / RAM
RAM keeps active data available at low latency and normally loses its contents without power.
Understanding NVMe SSDs
NVMe is a protocol for non-volatile storage over PCI Express; form factor, lane count and protocol are not the same thing.
TCP
The Transmission Control Protocol provides applications with a reliable, ordered byte stream between endpoints.
DNS / name resolution
The Domain Name System is a distributed, hierarchical database for names and other resource records.
Watts, kWh, TDP and PSU ratings
Watts describe power and kilowatt-hours describe energy; neither TDP nor a PSU wattage label is a wall-power measurement.
Power measurement boundaries and meter accuracy
Comparable power readings require the same measurement boundary, a suitable operating range and openly documented measurement uncertainty.
A protocol for measuring power draw
A lightweight protocol makes idle, typical-load and controlled-load readings reproducible without presenting them as an official certification.
Browse by topic
IT fundamentals
Terms, models and standards that modern systems build upon.
2 pagesHardware
CPUs, storage, servers, interfaces and traceable measurement data.
6 pagesOperating systems
Linux, Windows, macOS, hypervisors and system operations.
3 pagesNetworking
Protocols, naming, routing, Wi-Fi and troubleshooting.
3 pagesHomelab & storage
Server planning, NAS, backups, energy and reproducible labs.
8 pagesIT security
Risk, identity, updates, secure baselines and recovery.
1 pageCloud & development
Containers, APIs, automation, version control and operations.
1 pageAI & automation
Models, agents, local inference, evaluation and cost control.
1 page