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The domain name suffix is a string that is appended to your computer name. This really is only used when you are resolvable via your FQDN. For example, if you worked at Company, and your computer name was CName, you would likely be assigned a domain suffix of Company.com, this would then make your location on the network CName.Company.com. This makes it easier to do all kinds of things, but is not needed in a home environment.
Some ISP's will push this down the wire, so you'd have a suffix of cox.net if your ISP was Cox Communications. Why is yours f? Your ISP has assigned that, or you set some override value by accident. It doesn't mean anything, and won't have any impact on anything you're doing.
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