Question about sasl_client_start()

[ctosgh]

Greetings,
 
As the doc said
"This function starts an authentication session. It takes a list of possible mechanisms (usually gotten from the server through a capability command) and chooses the "best" mechanism to try. Upon success clientout points at data to send to the server"
 
I am confused by "usually gotten from the server through a capability command". What does it exactly mean?
 
Let's take ldap client for an example, is there a real LDAP operation sent to server over the network to get the mechanisms list supported by server if this function is called? 
 
Thanks,
jacky
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