Are Google Cloud Functions protected from DDoS attacks?

Question

As far as I understand, my Google Cloud Functions are globally accessible. If I want to control access to them, I need to implement authorization as a part of the function i

Answer 1

I have sent an email to google-cloud support, regarding cloud functions and whether they were protected against DDoS attacks. I have received this answer from the engineering team (as of 4th of April 2018):

Cloud Functions sits behind the Google Front End which mitigates and absorbs many Layer 4 and below attacks, such as SYN floods, IP fragment floods, port exhaustion, etc.