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

From the linked article:

Usually full (non-delta) snapshots are only sent when a game starts or a client suffers from heavy packet loss for a couple of seconds. Clients can request a full snapshot manually with the cl_fullupdate command.