Steve M. Taylor wrote:
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Looks to me unless you actually know your hardware stuff and have got it from experience, you're going to get found out....

Exactly. If the interviewer doesn't pick it up in the interview it will come out when you are asked to do a job and can't. Everyone likes to set their sights a little higher than what they are capable of and it's important that one does otherwise you won't learn anything new and you wouldn't be challenged in which case you would get bored, but when a company is looking for someone to do a specific job, they want someone who is currently on the level necessary to do what they need then.