November 2001
Intermediate to advanced
404 pages
14h 48m
English
Content preview from Designing Large Scale LansBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 10. Special Topics
This chapter deals with a few other topics that are too important to leave out, but didn't readily fit into other parts of this book: IP multicast, IPv6, and security. Not every site needs to employ these topics initially. To varying extents, they can all be retrofitted into existing networks.
IP Multicast Networks
Most TCP/IP applications operate like a telephone conversation. That is, one device makes a connection with another, they exchange information, and then they disconnect. This activity is appropriate and efficient for some types of applications. Allowing any device to call up any other device avoids the overhead of maintaining a mesh network in which every device is permanently attached to every other.
There are some types of applications that do not work well in this telephone-call model, though. For example, it would be extremely inefficient to run a radio station this way. Radio stations work by broadcasting a single signal. This common signal is received by many end devices simultaneously. Thus, everybody who listens to this station hears the same news or music at the same time. It would be extremely inefficient if this simultaneous broadcast required sending the same signal separately to every device.
Sending the same signal thousands of times is not only inefficient on the server; it also uses the network bandwidth poorly. Radio and television broadcasting are effective partly because the signals are sent only once. Sending the signals ...
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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.