Firewall as a Service Market Size By Product (Firewalls [Proxy Servers, Stateful Inspection Firewall, Unified threat management (UTM), Next-generation Firewall (NGFW)], Management Software/Tools [Auditing & Compliance, Cloud Security, Connectivity Management, Automation, Backup & Recovery]), By Application (BFSI, Healthcare, Government, Retail, Education, Manufacturing), By Service Model (SaaS, Ia