Applying CU's and Service Packs

Question

When applying a service pack or CU to SharePoint, are clients still able to connect to the web application and use sites within my collection while i'm applying the patches or running PSconfig afterwords?

Is there a suggested way that would keep them out until things were applied, I don't have another farm to point them to or another server/database to handle requests.

Answer 1

No IIS will be down while you're running PSConfig.

On how to keep the users out see What is the best practice for redirecting users when sites are being upgraded?