IP networks may monitor life-critical services but must not control them in any manner. 

IP networks are a crucial part of monitoring and controlling life-critical services. 

IP networks must not monitor life-critical services but may control them. 

IP networks must not monitor and control life-critical services under any circumstances. 

SD-WAN can be implemented physically or virtual, or a combination of both, as long as all elements are supporting the instruction set. 

SD-WAN is not implemented, it is only a matter of connecting to a service through the internet. 

SD-WAN can only be implemented virtually, since it is a software-controlled network. 

SD-WAN can only be implemented physically, the necessity of  network hardware cannot be ignored. 

Bit, Symbol 

Application, Presentation 

TCP, IP 

Media, Host 

Patch panel

CE 

Rack 

PE 

Dual Wide Data Mitigation

Datacentre Work Direct Management 

Dependable WAN Dual Management

Dense Wavelength-Division Multiplexing