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Will segmenting wi-fi SSIDs limit the spread of viruses, trojans and the like?

Seeing I am new to the world to networking and need to set up a router, what is the purpose of having multiple SSIDs. Not sure if this qualifies as a separate question (and if it does let me know and I'll post it as a separate question), what is the purpose of having multiple antennas on the router/modem?

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marked as duplicate by Ward, sleske, Scott Pack, Bart De Vos, EEAA May 30 '11 at 23:12

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

This is pretty much a dup of your previous question:… SSIDs have nothing to do with routers except for the fact that consumer-grade access points are often also routers. In any case, this is off-topic, it's not a professional sysadmin question. – Ward May 30 '11 at 22:28
@Ward- I disagree as the question in my previous post was whether SSIDs provided any form of security. Secondly, it is a professional sysadmin question as I need to implement a secure wireless network as part of my role as junior administrator. – PeanutsMonkey May 30 '11 at 22:50
@Ward - Also when you say they have nothing to do with routers, can you please clarify? Please do not ignore/disqualify the fact that SMEs often use consumer-grade routers/modems. – PeanutsMonkey May 30 '11 at 22:52
At the very least, you need to be clearer: you say you're setting up a router, but your question is only about SSIDs, which is really the access point functionality of a wireless router, not the routing capability. The answer you accepted to your previous question pretty much covers why you might want to have different SSIDs. And answers to your antenna question are easily googled. – Ward May 30 '11 at 23:00
@Ward - That is correct I am setting up a router that allows me to set up multiple SSIDs as well. I apologize if what I was referring to was not about routing however the question does not answer what multiple SSIDs do? For example I understand they can separate networks however is that all? – PeanutsMonkey May 31 '11 at 0:09
up vote 4 down vote accepted

Having a wireless router broadcast multiple SSIDs means that it creates multiple networks. This is useful, for example, for creating a password-protected internal network and a public guest network. The router separates traffic so that people on the guest network can't interact with people on the private one.

As far as I know, multiple antennas are just for increasing range.

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Thanks. – PeanutsMonkey May 30 '11 at 22:53

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