Module 9
NAT and Access Control
How private networks reach the internet, how a server is published back out, and how to control what may talk to what.
In this module
- Explain what NAT rewrites and why inbound connections need a forward
- Publish an internal server through a port forward
- Write an access list whose order and direction do what you intended
Activities
NAT and PAT
Many private addresses, one public address, and what that breaks.
Lab: get the LAN online
A private network and one public address. Configure PAT so every host can reach out.
Lab: publish a server
Outbound works, inbound does not. Create the translation that lets the world in.
Access control lists
Order, direction, and the implicit deny at the end.
Lab: default deny
Start from denying everything and permit only what the brief calls for - including the return traffic.
Lab: block one subnet
Keep one network out of another without disturbing anything else. Order and direction both matter.
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Curriculum topics
Each topic page lists every lesson, quiz and hands-on lab that covers it, plus how it maps onto the CCNA and Network+ blueprints.