Summary of CIDR

In summary, CIDR solves the following problems:

• Address exhaustion—the Internet was just running out of addresses.

• The network resources required to manage huge routing tables were becoming untenable.

WARNING Connecting to an ISP requires some consideration because the addresses used in your organization were provided by the ISP. If you change your ISP, that address space will have to be relinquished back to the ISP. This requires readdressing of the network or some software application to translate the addresses. The Network Address Translation (NAT) product offered by Cisco is one such application, though there are many different solutions on the market.

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