Dealing with players who endlessly ask questions about technology.

I am running a GURPS game set in Mike Pondsmith's Cyberpunk.

One of my players has been asking endless questions about the nature of the tech in the setting. "Does wireless hacking exist? What are the limitations of cyberware? What about smart clothes? Can I get a drone? What about smart grenades? Can monowire cut through walls? Why not? That doesn't make sense because realistic \[thing\]. That's kind of retro-futurist though and I don't like that. What about this thing? How about this?"

Sometimes I have an answer, sometimes I don't. I feel pressured to deliver an answer but sometimes I need to consider the gameplay ramifications of such an answer.

I like this player. How can I gently shut down discussion on things that I can't feasibly answer immediately but the player insists are important to know right now?