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.
When you use bridged networking, your virtual machine is connected to the LAN as if it were a physical PC connected to your network. It can be assigned a DHCP address or a static IP address. You can configure shares on your virtual machine and ping any machine on your LAN including the host PC. In other words, when you use bridged networking, you are taking a physical network adapter on your host PC and allowing your virtual machines to communicate with the physical network.