What is the life cycle of WCF services?

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WCFServices

Recently in an interview, I've been asked for Life cycle of WCF service. I've never heard about this topic so couldn't answer it :(. I googled about it and found implementation steps as life cycle but this is not the thing that I'm expecting.
Basic Programming Lifecycle

I would appriciate if anyone can help me on this topic.

What I have tried:

I googled about it and found implementation steps as life cycle but this is not the thing that I'm expecting.
https://msdn.microsoft.com/en-us/library/ms732098(v=vs.110).aspx