| Even if your network starts with two
routers and a link, it's never too early to begin planning how your
internetwork will look as it grows. You also need to think about
network design because of increasing connectivity demands and the
phenomenal growth of today's internetworks. In order to meet these
growth requirements, the internetworks you design and build must be
scalable. Scalable internetworks are typically described as flexible
and expandable networks that are experiencing constant growth and
that can be adjusted without major modification.
In this chapter, you will learn about hierarchical design
principles for building scalable internetworks and you will learn
how routers can provide the critical elements required to build
scalable internetworks by offering varying levels of connectivity
for workgroups and critical networks, such as a backbone network. In
addition, you will be introduced to key characteristics for building
a secure, responsive, and adaptable internetwork.
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