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Networking Interview Prep

Use this page as a revision map. Every tutorial in the Networking track already ends with interview questions — work those first, then stress-test the themes below.

How to practise

  1. Answer out loud in two minutes without notes
  2. Draw the architecture on paper or a whiteboard
  3. Name the failure mode and the first three debug commands
  4. Tie the topic to security (identity, secrets, blast radius)

High-yield themes

  • Subnetting under pressure
  • DNS debugging workflow
  • TCP handshake and congestion ideas
  • Load balancing choices
  • Zero-trust vs perimeter firewalls
  • Packet capture ethics and filters
  • Trust-zone / blast-radius design
  • Load-balancer health-check failures vs app bugs
  • Firewall change control and rollback
  • First-hour network incident evidence

Hands-on prompts interviewers love

  • Walk through a recent lab from the track as if it were an incident
  • Compare two designs and defend a trade-off (simplicity vs resilience)
  • Explain what you would monitor after a change ships