FAQ

What is the purpose of the network being designed?

Q: What is the purpose of the network being designed?

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Thomas A. Limoncelli is an internationally recognized author and speaker. He is best known for his books The Practice of System and Network Administration (with Christina J. Hogan and Strata R. Chalup), Time Management for System Administration and The Complete April Fools RFCs (with Peter J. Salus). Read more about Tom and his books at Everything Sysadmin.

This is the question that you should use to probe what kind of applications the client is going to be using on the network. By knowing the applications, you determine what speeds and other qualities you need in the network. Customers often don't know the exact amount of bandwidth they need, or other features, but bandwidth is usually the overriding one.

One should measure application requirements from real-world examples, so if you can spend time monitoring the network to determine average bandwidth used by certain applications, you're going to be able to do a much better job.

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Download Tom's FAQ podcast or read a chapter on centralized/decentralized networks from The Practice of System and Network Administration, 2nd Edition, by Thomas A. Limoncelli, Christina J. Hogan and Strata R. Chalup.

Latency is another quality that you should investigate. Some applications require low-latency networking, like NFS, [which] really requires less than two milliseconds of latency, while other things, like FTP, can work on very high-latency networks.


This was first published in February 2008

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