sr network engineer interview questions

I'm sure this question asked before.  Need to hire a sr. network engineer.   Specialized on pans, junipers, aruba, network design and architecture, etc.
What things should i look for and specific questions should be asked.  
Thanks in advance.
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nociSoftware EngineerCommented:
sorry this is too broad.... on another note, you also need to know the answers before. And not all answers are absolute.., there can be variations on a theme how to validate those?
First check CV's and verify references on them.  Maybe verify from other sources if knowledge/experience is relevant.
possibly check social sites (after permission) about lifestyle & attitude.

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