non-disclosure agreements

[http://dummy.us.eu.org/robert (Robert)]

Hi.  Noelle gave me your e-mail address.

I fear that I may have to sign an NDA for a job interview next Tuesday.  I
have an interest in the technical field that the company is involved with.
If I sign an NDA, will that prevent me from starting my own company in the
same technical field?  Will it prevent me from interviewing/working at
another company in the same technical field if I don't get hired?

Thanks for any quickly advice.