Designing an Enterprise Network

How to grow from a single home router into a network that holds up: segmentation to limit blast radius, scaling and redundancy to survive load and failure, and a security edge - firewalls, DMZ, VPN, zero-trust - that keeps the inside safe.

1. Segmentation Carving one big network into pieces - subnets and a calm take on CIDR and address planning, VLANs to separate departments on shared hardware, and why segmentation limits both the blast radius of a breach and everyday contention.
2. Scaling & Reliability Keeping a network up under load and through failure - load balancers that spread traffic across many servers, redundancy so no single link or box is a single point of failure, and the infrastructure services (DHCP, internal DNS) a real network quietly runs on.
3. Security & the Edge The perimeter and beyond - firewalls and stateful filtering, the DMZ that keeps public-facing services apart from the internal network, VPNs for secure remote access, and why zero-trust thinking replaces blind faith in the perimeter. Ties the whole design back to segmentation.