As with real servers, the virtual machines managed by the hypervisor need to communicate with each other and with the outside world to accomplish different tasks (e.g., an application server communicating with a database server). This leads to the concept of virtualizing networking devices, in addition to virtualizing desktops and servers as detailed in the previous section (see Figure 7.3 below).
Before moving to the virtual world, servers and desktops were connected to networks composed of enterprise switches, firewalls, routers, and other devices that offered necessary functionality and features, including redundancy features. Now that servers and desktops have . . .
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