Most good candidates know this, and will actively avoid "DevOps" roles.
Now someone claiming 10 - 16 years experience as a DevOp, is : A: Lying. The term is 6-7 years old B: If they have even been using / administering computers for that long should know what a default route is.
Could they have misinterpreted the question? I know the even at a senior level, interviewees can get flustered and confuse themselves.
What job title would you suggest to find people with a working knowledge of programming, config management, and infrastructure/systems internals? If all you can do is copy-paste jenkins tutorials off of the internet, you're not a "senior" anything.
Just saying in case you and your candidates have a different idea of the role you are hiring for.
But that is what you get with great buzzwords like DevOps.