Registration of SPNs for Availability Groups

Manually registering SPNs for Availability group - 1. Do I need to register SPNs for the AG Listener **as well as the individual nodes**, for both the instance name and the listening ports for the managed service account? The application uses the Listener to connect, are SPNs required for the individual nodes if using Kerberos authentication? 2. Does the Listener name have to be same as the AG name?