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.
Ethernet Switch (rear view). A network switch is a small hardware device that centralizes communications among multiple connected devices within one local area network (LAN). Standalone Ethernet switch devices were commonly used on home networks many years ago before home broadband routers became popular.