Real-time multiplayer game (concept question)

Question

I\'ve been reading this article from Valve that seems to explain the architecture of their multiplayer system. It seems they delay rendering by a couple ticks on the client so t

Answer 1

I'm guessing every once in a while they send a full snapshot. this is why laggy games involve people running at the wrong speed as delta frames are dropped, then "teleporting" to the correct position when a full snapshot comes in.