IP Routing in a Subnet or Classless Addressing (CIDR) Environment
As discussed in the previous chapters, there are three main categories of IP addressing: classful, subnetted classful, and classless. The method used for determining whether direct or indirect delivery of a datagram is required is different for each type of addressing. The type of addressing used in the network also impacts how routers decide to forward traffic in an internetwork.
One of the main reasons why the traditional class-based addressing scheme was created was that it made both addressing and routing relatively simple. Remember that IPv4 was developed in the late 1970s, when the cheap and powerful computer hardware we take for granted today was still science fiction. For ...
Get TCP/IP Guide now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
