Ramesh GaireSystems Engineer

Making strange tech familiar

Infrastructure labs, plain-English explainers and real lessons from working in tech. Watch the walkthroughs, then try the labs yourself.

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How a web request finds its waySimulation
Network diagram: your laptop connects through a switch and a router to the internet, which leads to a DNS resolver and a web server. A request to app.example.com finds the gateway, resolves the name, opens a TCP connection, checks the TLS certificate and receives HTTP 200.
Step through it yourself

Start with a lab

All 6 labs

Real scenarios, worked through step by step. Most include a simulation you can't break.

Troubleshooting and IT supportInteractive

Can't reach the service: a DNS and connectivity drill

A user can't open a web app. Find which of four faults is behind it, using real commands on a simulated laptop.

IntermediateAbout 25 minutesCommand lineSimulation + real-world
  • DNS
  • troubleshooting method
  • default gateway
  • firewall
Microsoft 365 and Entra IDInteractive

Read a sign-in like an admin: Conditional Access decisions

Change who signs in, from where and on what device, and watch six policies decide. Then read the same decision in a real sign-in log.

IntermediateAbout 30 minutesAdmin portalSimulation + real-world
  • Microsoft Entra ID
  • Conditional Access
  • MFA
  • Zero Trust

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Not sure where to start?

All learning paths

  1. Networking fundamentals to network troubleshooting

    Understand how data really moves, from addresses and subnets to DNS and TLS, then learn to find faults methodically instead of guessing.

  2. IT support to systems engineering

    Build on day-to-day support work with the systems, identity, scripting and troubleshooting depth that systems engineering roles expect.

  3. Microsoft 365 fundamentals to Entra ID and Intune

    Go from using and supporting Microsoft 365 to understanding the identity and device management that controls access to it.

Want structured help? Courses, hands-on Lab Days and mentoring are in development.

Find out more

The best way to learn it is to break it safely.

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