During technical interviews, don't try to bullshit your way through a question you don't know the answer to. It's not making you look good. Obviously, try to know the answers to questions you are most likely going to get asked.
But when you truly don't know. Be honest and just say
"Hmmm, I never thought about that" or
"I'm not quite sure" and follow up with
"I don't know, but I'm curious now!"
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During technical interviews, don't try to bullshit your way through a question you don't know the answer to. It's not making you look good. Obviously, try to know the answers to questions you are most likely going to get asked.
But when you truly don't know. Be honest and just say
"Hmmm, I never thought about that" or
"I'm not quite sure" and follow up with
"I don't know, but I'm curious now!"