This week focused on network-layer security and how routing, addressing, and lab simulations fit into secure network engineering.

Completed this week

  • Practiced subnetting and NAT concepts.
  • Completed a Docker-based lab related to network traffic and denial-of-service concepts.
  • Continued wargame practice with Bandit or Natas.
  • Discussed the evolution of IP addressing and Layer 3 security.
  • Added module vocabulary through the glossary activity.

Projects

Subnetting and NAT Practice

Focus: IP Addressing / Network Design

Summary: Worked with subnetting and NAT as core pieces of network structure.

What I learned: Good network design depends on understanding address space, segmentation, and how traffic moves between networks.

Docker-Based Traffic Lab

Focus: Network Simulation / Security Testing

Summary: Used a controlled lab environment to study traffic behavior and defensive implications.

What I learned: Containerized labs are useful for safely practicing network security concepts without exposing real systems.

Layer 3 Security Discussion

Focus: Network Layer Security

Summary: Reviewed how IP addressing and network-layer decisions affect security.

What I learned: Addressing, routing, and segmentation are security-relevant design choices, not just networking details.

Currently learning

  • Subnetting and NAT
  • IP addressing strategy
  • Network-layer security
  • Docker-based lab environments
  • Safe simulation of network behavior

Biggest takeaway

The biggest takeaway this week was that network structure directly affects security visibility and control. Subnetting, NAT, and Layer 3 decisions shape how defenders monitor and protect systems.

Next focus

  • Continue wargame practice.
  • Move into transport-layer and VPN-related security.
  • Keep connecting lab work to defensive monitoring.