The influenza vaccine is unusual in that most years a different vaccine is made. Because strains of influenza virus that circulate in the community can differ from one season to the next, the vaccine must change to best protect against those different strains.
In VMware, switches are used to establish a connection between the virtual network and the physical network. With ESX and ESXi, two different kinds of switches can be used: standard switches and distributed switches.
Big Switch Networksâ Big Virtual Switch is one example of an SDN overlay application. Big Virtual Switch makes it possible to run a software-defined network on top of any infrastructure, whether or not itâs compatible with OpenFlow, the de facto standard protocol for SDN controllers and switches.