Theory · Networking for DevOps

15 min · Module 4 · Theory

How to study this topic

Read the theory below (concepts, bullets, and shell/YAML examples).
Try the Exam pool and Book quizzes in this module.
After each quiz, use Show answer on every question to review.

Networking for DevOps

Understand DNS, HTTP/TLS, load balancers, and cloud VPCs. Ingress controllers and service meshes route traffic in Kubernetes; reverse proxies terminate TLS at the edge.

DNS: A/AAAA/CNAME records — propagation and TTL affect failover.
Load balancing: L4 (TCP) vs L7 (HTTP path/host routing).
TLS: terminate at LB or pass-through; cert rotation automation.

Shell, YAML & config examples

# Debug DNS
dig api.example.com +short
curl -vI https://api.example.com/healthz

# Check listening ports
ss -tlnp | grep 8080

Hands-on practice: /lab/