The firewall is the one network device that is both infrastructure and policy. This selection covers firewalls and security appliances from branch-office units to rack-mounted platforms, along with the security-focused appliances that sit beside them in a layered design.
Size by inspected throughput, not interface speed. Every security feature enabled - inspection, filtering, VPN - costs performance, so the number that matters is throughput with your feature set turned on, at the connection counts your network actually generates. Just as important is the subscription: most platforms deliver their security value through licensed services, so price the appliance and its renewals as one multi-year figure rather than a hardware line item. High-availability pairs belong in the plan wherever the internet connection is business-critical. COLAMCO quotes security platforms with their subscriptions and support for business, government, and education customers, including multi-year and co-termed structures.