Explain why aggregation is not used for IPv4 addresses on Internet routers.
What will be an ideal response?
Aggregation might have worked with IPv4 addresses if they had not been allocated in a very inefficient way. At this point, many organizations would have to give up their class licenses, and they simply will not do that. Even if it were possible to take back class licenses and reallocate them in a way to support aggregation, it would require a huge amount of joint effort and would bring down the Internet for some time. [Not stated in the chapter: the new IPv6 has many features, in addition to built-in aggregation, that make it worth migrating to, rather than "fixing" IPv4.]
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