-|Network security|Using an IP firewall is the first layer of protection to secure your database. Azure Cosmos DB for MongoDB vCore supports policy driven IP-based access controls for inbound firewall support. The IP-based access controls are similar to the firewall rules used by traditional database systems. However, they're expanded so that an Azure Cosmos DB for MongoDB vCore cluster is only accessible from an approved set of machines or cloud services. <br><br>Azure Cosmos DB for MongoDB vCore enables you to enable a specific IP address (168.61.48.0), an IP range (168.61.48.0/8), and combinations of IPs and ranges. <br><br>All requests originating from machines outside this allowed list are blocked by Azure Cosmos DB for MongoDB vCore. Requests from approved machines and cloud services then must complete the authentication process to be given access control to the resources.<br><br> You can use [virtual network service tags](../../../virtual-network/service-tags-overview.md) to achieve network isolation and protect your Azure Cosmos DB for MongoDB vCore resources from the general Internet. Use service tags in place of specific IP addresses when you create security rules. By specifying the service tag name (for example, AzureCosmosDB) in the appropriate source or destination field of a rule, you can allow or deny the traffic for the corresponding service.|
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