IT job interview Totally fucked

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So long story short I submitted an application to sys-admin/data center job with a "notable" yet not to be named government intelligence agency. I did it because why the fuck not and partly for shits and giggles because what the hell could go wrong?
It was all fun and games until "shits and giggles" called me just an hour ago. They want to setup an interview on monday and I'm fucked!
I'm having a panic attack here, I don't know jack shit about networking

What the fuck am I going to do? I'm having a full on panic attack here! I don't know jack shit about networking outside of the barebone basics and my computer knowledge is just hardware based like building your own PC A+ cert bullshit and basically the shit you pick up here on /g/. Their going to run me through a fucking security clearance and poly find out i'm a fraud (i put down my dad friends IT company as place I worked for to which he agreed to be my reference).
I'm going to be blacklisted probably and never be able to work even a private sector job let alone a .gov one if I drop the spaghetti on this.