Claviro

Advanced Networking

NAT, VLAN, VPN, Security Controls

NAT, VLAN, VPN, Security Controls

Design secure segmented networks using NAT, VLAN isolation, VPN tunnels, firewall, IDS, and IPS.

Advanced Level

Design secure segmented architectures with NAT, VLANs, VPN, firewall, IDS, and IPS.

Click the numbered markers on each diagram to explore the concept step by step.

Why This Matters

Segmentation and edge controls are practical foundations of enterprise security.

Confusion Busters

Common confusion: NAT equals firewall

Fix: NAT translates addresses; firewall enforces traffic policy.

Common confusion: VPN replaces segmentation

Fix: VPN secures transport path; VLAN/ACL handle internal isolation.

NAT and Port Forwarding

  • ▸NAT translates private-to-public addresses.
  • ▸Port forwarding publishes selected internal services.

NAT Translation

192.168.1.10 (Private)
src rewrite▼
NAT Router
203.0.113.1 (Public)
→
Internet
:443 → 192.168.1.50 (Port Forward)

VLAN, VPN, Firewall, IDS, IPS

  • ▸VLANs reduce broadcast scope and lateral movement.
  • ▸VPN creates encrypted tunnels over untrusted paths.
  • ▸Firewall/IDS/IPS provide preventive and detective controls.

Layered Defense Architecture

IPS — Inline Block
IDS — Detect & Alert
Firewall — Policy Control
VLAN — Segment & Isolate
VPN — Encrypted Tunnel