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  1. USEvgeny Goldin
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    1. COWhenever you talk about AMI image ID you should always talk about a Region as well - these IDs are not universal and can only be used in a context of a specific Region. It can be nicely seen in [Ubuntu Cloud Images](http://cloud-images.ubuntu.com/releases/saucy/release-20131113/).
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    2. COIn EC2-classic (a usual way to launch EC2 instances) instances are always launched in a public network. In VPC they're either launched in a public or a private network. Once in a private network - they can be totally isolated from the external world and only SSH-ed to from specific boxes in a public network (typically SSH gateway) or from inside organization (on-premises) network if VPC is connected to it which it doesn't have to.
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    3. CO[User Guide](http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Introduction.html) would be a place to start. Yes, introducing VPC makes the setup more secure but more involved, as a result - there are more "moving parts" to manage: [ACLs](http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_ACLs.html), [NAT](http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_NAT_Instance.html), [Internet Gateway](http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Internet_Gateway.html), and [Route Tables](http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Route_Tables.html).
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