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LabsProtocolsOSI Map

Current Labs

Subnet VisualizerBinary ConverterTCP HandshakeOSI ModelDNS FlowRoutingARP Broadcast

Reference

Tools

Local MVP mode

Mock data only. Auth, payments, storage, and APIs are represented by contracts.

Learning workspace

Name resolution

DNS Flow Visualizer

Follow the step-by-step lookup that turns a domain name into an IP address.

Recursive DNS lookup

Follow the question from your browser to the server that can answer it.

Browser checks cache

The browser and OS cache are checked before any network request leaves the device.

DNS is a chain of referrals. Most servers do not know the final answer, but they know which server should be asked next.

Quick practice

Pause on the TLD step. What does the TLD server return: the website IP, or the authoritative nameserver to ask next?