The security mechanism attribute is an optional, multivalued attribute that contains one or more OID strings for Sybase security mechanisms supported by the server.
Client applications specify a connection’s security mechanism by setting the CS_SEC_MECHANISM connection property (or accepting the default). See “Choosing a network security mechanism”.
Security mechanism OIDs are mapped to local security mechanism names by the Sybase global objects file. See “Global mechanism names”.
If the security mechanism attribute is present in a server’s directory entry, then clients connect to the indicated server using only the listed services. If no security mechanism attribute is present, then clients connect using any mechanism that the server is configured to support.