Computer Networks

A book-shaped table of contents for computer networking, from first principles to production systems: Ethernet through IP, TCP/UDP/QUIC, DNS, the HTTP ecosystem, security, cloud/Kubernetes networking, performance engineering, observability/debugging, and distributed-systems networking — cross-linking existing kubernetes/sre/system-design/tech notes instead of duplicating them.

1 — Packet Analysis

tcpdump and Wireshark as the tools for capturing and reading raw packets and TCP streams.

3 — DNS Debugging

dig, nslookup, and host as the tools for debugging DNS resolution problems.

4 — HTTP Debugging

curl, Postman, and HTTPie as the tools for debugging HTTP requests and responses directly.

5 — Kubernetes Network Debugging

kubectl exec, ephemeral containers, BusyBox, Network Policies, and Cilium monitor as the toolkit for debugging networking inside a Kubernetes cluster.