Ethernet, ARP, and Neighbor Discovery Explained
Learn how Ethernet frames, switches, VLANs, ARP, and IPv6 Neighbor Discovery deliver packets on a local link, with Linux diagnostics and failure examples.
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Event Envelopes and Metadata for Reliable EDA
Learn how event envelopes separate transport context from payload, apply CloudEvents attributes, propagate correlation IDs, and validate messages safely.
Event Security and Sensitive Data in EDA
Secure event-driven systems with least-privilege identities, encrypted transport and payloads, careful data minimization, and a deliberate retention plan.
Forward and Reverse Proxies: Routing, Trust, and Use Cases
Learn how forward and reverse proxies handle HTTP traffic, CONNECT tunnels, TLS termination, caching, routing, trusted headers, and production failures.
IP Routing and NAT: How Packets Cross Networks
Learn how routers choose paths with routing tables, longest-prefix match, and gateways, then see how NAT and port translation change packets at network edges.
IPv4 and IPv6 Addressing: CIDR and Subnetting
Read IPv4 and IPv6 prefixes, calculate subnet membership, plan routes, and avoid CIDR overlap with practical examples in Python and production network design.
Network Observability: Signals for Reliable Services
Track network health across hosts, DNS, paths, proxies, and requests. Learn which signals help diagnose failures without confusing telemetry with service SLOs.
Network Performance: Latency, Throughput, Jitter & Loss
Understand bandwidth, throughput, latency, RTT, jitter, and packet loss with practical measurements, tail percentiles, and production diagnostic guidance.
OSI and TCP/IP Network Models
Compare the OSI and TCP/IP models, trace an HTTPS request through their layers, and use the models to narrow network failures without confusing abstractions.
Packet Capture and Network Troubleshooting: Layered Workflow
Use a layered workflow to diagnose DNS, route, TCP, TLS, and HTTP failures with ping, curl, tcpdump, and Wireshark, then collect useful incident evidence.