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.
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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.
Replay and Reprocessing in Event-Driven Systems
Learn how to replay event streams safely, choose offsets and cursors, isolate side effects, and recover projections without confusing replay with retry.
TCP Congestion Control: Flow, Loss, and Fairness
Learn how TCP congestion control limits traffic, responds to ACKs and loss, and affects throughput, latency, and fairness, with Linux inspection commands.
Backend Configuration, Environments, and Dependencies
Learn how backend services load configuration, separate development from production, validate settings, and manage dependencies without leaking secrets.
Background Jobs, Scheduling, and Worker Pools
Design background jobs and worker pools with bounded concurrency, safe retries, scheduling, and production checks that keep slow work out of request paths.