DNS Resolution
Follow a DNS query from your browser through recursive resolvers, root servers, TLD servers, and authoritative nameservers. See caching, TTLs, and record types in action.
Networking
Understand how data moves across networks — from DNS resolution and TLS handshakes to load balancer algorithms and failure recovery.
8 guides 5 visualizations 3 simulators
Visualizations 5 visualizations
HTTP/2 Multiplexing Visualization
Walk through how HTTP/2 replaces HTTP/1.1 connection queues with binary frames, stream identifiers, multiplexing, flow control, and scoped stream errors.
Load Balancer Algorithms
Visualize no balancing, round robin, weighted routing, least connections, response time, IP hash, health removal, slow start, and L4/L7 routing decisions.
TCP SYN Flood & Mitigation
Walk through the TCP SYN Flood lifecycle with guided steps for SYN, SYN-ACK, ACK, backlog, and SYN cookies.
WebSocket Lifecycle & Frame Protocol
Explore the complete lifecycle of a WebSocket connection, from the HTTP 101 upgrade handshake to RFC 6455 frame format, XOR masking calculations, heartbeats, fragmentation, and teardown.
Simulators 3 simulators
CDN Edge Caching Simulator
Simulate a CDN with multiple edge PoPs, an origin shield, and an origin server. Watch cache hits, misses, SWR revalidations
Load Balancer Crash Simulator
Experiment with HA failover, stale DNS/client caches, backend health checks, fail-open routing, overload, latency, and recovery when a load balancer crashes.
TCP Congestion Control
Simulate TCP congestion control mechanisms. Watch packets flow and observe Slow Start, Congestion Avoidance, and Fast Retransmit phases. Experiment with packet loss, latency