| If you select a
fixed-configuration router, you receive the router with the
interfaces on the box. However, you cannot add or change interfaces
on a fixed-configuration router. Modular routers and access
servers are usually built with one or more slots that allow you to
customize the box.
You can determine the types of interfaces on
the router by selecting various feature cards, network modules, or
WAN interfaces, such as those shown in the Figure. Although modular
routers require more equipment than fixed-configuration routers,
they are more scalable and will allow your network to grow.
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