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Chapter 3
IP Addressing
fter a review of fundamental IP addressing concepts, which detailed
the various classes of IP numbers in addition to the concepts of subnetting
and CIDR, this chapter discussed how to preserve IP addresses by using
VLSMs (Variable-Length Subnet Masks). It also examined various design
considerations, such as using contiguous network addressing and using
classless routing protocols (e.g., RIPv2 and EIGRP).
Next, we introduced the concept of route summarization. We saw how
router resources, such as memory and processor cycles, could be preserved
by representing contiguous network address space by a single route adver-
tisement. We also showed how to overcome the caveat of having discontig-
uous address space by using such methods as disabling automatic
summarization on our routers and by using IP unnumbered.
Key Terms
Before you take the exam, be sure you are familiar with the following terms:
Classless Interdomain Routing (CIDR)
IP address
IP unnumbered
route summarization
subnet mask
Variable-Length Subnet Mask (VLSM)
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