There are 15 types (profiles) of SSL certificates available from the eduPKI CA specifically for GÉANT's Multi-Domain Network Services:
A Certificate of the "Server and Client" profile series is a combined SSL-Server and SSL-client certificate. With this profile it is feasible to:
Note: A certificate of type "Server and Client" is most useful for a service that acts as a server for other clients as well as connects as a client to other services. A typical example for such a service is a Mail Transport Agent (MTA, mail server) which acts as a server when receiving emails from other MTAs or from its local email clients as well as a client when it is delivering/forwarding queued emails to their recipients' remote MTAs.
A Certificate of the "Client" profile series is an SSL-client certificate, which can only serve the purpose to authenticate a client machine to an SSL-server (i.e. SSL client authentication):
Client Certificate Profile Series