Centralized and Distributed Deployment Options for Security ServicesFundamental Network Firewall TechnologiesIndustrial Protocols and the Need for Deeper Packet InspectionAlternative Solution: Deep Packet InspectionApplication Visibility and ControlIntrusion Detection System and Intrusion Prevention SystemAdvanced Persistent Threats and Behavioral AnalysisMalware Protection and Global Threat IntelligenceDNS-Based SecurityCentralized Security Services Deployment Example Using NSO, ESC, and OpenStackDistributed Security Services Deployment Example Using Cisco Network Function Virtualization Infrastructure Software (NFVIS)SummaryReferences