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For a senior role? no. They should be asking you how deep you want to go. And you should be the one stopping them for time. If your SRE/DevOps can't wax poetic about the deep deep details, how are they going to get you out of the ditch when production goes down at 11am on a Tuesday, or 11pm on a Saturday

I’d expect an SRE to know about all that.

> CDN and WAF seems unfair, those go beyond the definition of the web

Current web is full of WAFs and CDNs, devops should know that they exist at the very least.