STAS authentication & CAA

Question

Hi all, 
 I want to know if caa is more efficient than stas authentication? 
 when to use caa and when to use stas ?what could be the difference between stas and CAA? 
 Does CAA automatically require firewall integration with AD? 
 Can we use stas authentication and caa at the same time in a network? Thanks

MayurMakvana · Answer

Hello, 
 Greetings, 
 Thank you for reaching Sophos community! 
 Both the authentication method has their own working method and it is better that one understands the working of each and use the one which is best suitable to their network. 
 Please review the recommended reads for the STAS: 
 Sophos Firewall: Best practice for STAS 
 You may also refer about CAA using below: 
 https://support.sophos.com/support/s/article/KB-000038465?language=en_US 
 We can also use both the authentication method in the network and should not create any issue.