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A shared network can be accessed by virtual machines that belong to many different accounts. Network Isolation on shared networks is accomplished by using techniques such as security groups, which is supported only in Basic zones in &PRODUCT; 3.0.3 and later versions. Shared Networks are created by the administrator Shared Networks can be designated to a certain domain Shared Network resources such as VLAN and physical network that it maps to are designated by the administrator Shared Networks can be isolated by security groups Public Network is a shared network that is not shown to the end users Source NAT per zone is not supported when the service provider is virtual router. However, Source NAT per account is supported with virtual router in a Shared Network. For information, see .