September 2002
Intermediate to advanced
288 pages
8h 36m
English
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Chapter 2. IP Addressing and the BGP Protocol
This chapter provides an overview of the IP address architecture and some interdomain routing history, followed by an explanation of the BGP protocol, information on how BGP relates to routing in general, and a discussion of Multiprotocol BGP.
IP Addresses
IP addresses are made up of two parts: the network part and the host part. Because IP addresses are only 32 bits in length, it’s not possible to have both a large host part (to accommodate networks with many hosts) and a large network part (to accommodate a large number of networks) at the same time. To get around this, there are three classes of IP addresses:
Class A addresses, with a 7-bit network part and a 24-bit host part, allow 128 networks with 16 million hosts each. The highest bit is always set to 0 in Class A address, so the first byte of Class A IP addresses ranges from 0 to 127.
Class B addresses, with a 14-bit network part and a 16-bit host part, allow 16384 networks with 65534 hosts each. The two highest bits are always set to 10 in Class B addresses, so the first byte of Class B IP addresses ranges from 128 to 191.
Class C addresses, with a 21-bit network part and an 8-bit host part, allow 2 million networks with 254 hosts each. The three highest bits are always set to 110 in Class C addresses so, the first byte of Class C IP addresses ranges from 192 to 223.
Note that the first address in a network (the all-zeros address) is the network address, and can’t be used. The last ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.