Data authorisation using WCF web services

I am new to web development and WCF. I am reading some basics about it and most of the things seem very interesting.

I have read that WCF services can be exposed using SOAP and other protocols. I was wondering whether there is an explicit implementation against data corruption during transmission built-in or it is left to user?

For example, if a service returns a string, what is the guarantee that it hasn't got corrupt during transmission (due to bad connectivity). This is not about detecting whether someone has hacked into system, I just want to ask about plain transmission errors.

From stackoverflow

• Do you mean message reliability?. If so, the link shows reliability for the different types of bindings.