I would say the most difficult question would be the one a person doesn't know. The interview process is only to find people that are suited for the job. If a person doesn't know the answer, it's likely that person hasn't prepared for the interview or isn't capable of doing the job.
Customer Support Engineer Interview Questions
1,128 customer support engineer interview questions shared by candidates
What is a Transistor and how does it work?
Describe a time where you had to make a last minute decision.
Can you work night shift?
Why do you want this job?
What do you do when working on software and you run into a roadblock?
What is SQL.
Tell us about your previous work experience
Describe an ERD
What is a DNS Server
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