# Using service-linked roles for AWS Client VPN
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AWS Client VPN uses AWS Identity and Access Management (IAM) service-linked roles. A service-linked role is a unique type of IAM role that is linked directly to Client VPN. Service-linked roles are predefined by Client VPN and include all the permissions that the service requires to call other AWS services on your behalf. 

**Topics**
+ [Client VPN usage](using-service-linked-roles-cvpn-slr.md)
+ [Connection authorization](using-service-linked-roles-client-connect-handler.md)