Most network security conversations start at the firewall. That's the wrong starting point. A secure enterprise network begins with how the network itself is segmented, routed and made redundant — decisions that determine how far a breach can spread before it's contained.
Segmentation is the first line of defence that has nothing to do with a security product. Separating user, server, guest and operational technology traffic into distinct VLANs with controlled routing between them means a compromised guest device can't reach your core systems by default.
Redundancy matters just as much for security as for uptime. A single point of failure in your network path is also a single point an attacker only needs to find once. Dual-homed core switches, redundant WAN links and tested failover reduce both downtime risk and the blast radius of an incident.
Once segmentation and redundancy are in place, perimeter and endpoint controls have something solid to sit on top of. Skipping straight to a next-generation firewall without this foundation is why so many well-funded security stacks still get breached — the network underneath was never actually designed to contain damage.
