Whether it's a job interview or a regular conversation there's one thing that I've found to improve my image - I say "I don't know" when I really don't know something that's being talked about.
There's no harm in admitting when you're not aware of something. It happens. It's impossible for us to know every little thing.
It's therefore wise to project your real image by letting the other party know that you're not aware of what he/she's talking about.
Admitting this doesn't make you a loser, it makes you trustworthy. It shows your honesty level.
People who try to cover up their knowledge gap by throwing random bullshit at the listener not only seem manipulative but also unreliable.
When you don't know something, admit it. You don't have to be a know-it-all.
Be honest. That's what matters.