Keeping two LANs separate - different subnets or vlan?

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I have a problem where I need to create two physically cabled and separate LANs and keep them separate so traffic cannot flow between the two. This is the easy part as the cables and hardware are all separate.

The problem is I can only access the internet (which both separate LANs must be able to do) using an ASA5505. I also have a basic understanding of how to use this device, mainly why I’m asking for help here.

If I plug each of the two LAN switches into the router, traffic from each LAN will be accessible from the other wont it? How can I stop this from happening?

Thanks

(The two LAN switches support vlans but are not currently being used)
 
Thanks for the quick replies, I'll have a read over the documentation this weekend and try some tests on Monday with our backup 5505. I'm happy we have a spare unit as its learning on the job for me with Cisco stuff so I really appreciate the help.

I'm not sure what level of license we have on the production ASA, so might need an alternate solution.
Could a second router be used to separate the second LAN from the first LAN and then onto the internet? or is that total rubbish?
 
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