UDP doesn't have any guarantee that packet is received. If you stream video that can handle few lost packet it is ok, but if you need reliability than you need

UDP doesn't have any guarantee that packet is received. If you stream video that can handle few lost packet it is ok, but if you need reliability than you need TCP. So, it's kind of programmer decision what to use. In reality there should be protocol that is lightweight and somewhere in between TCP and UDP (from personal experience). I haven't read anything about this new google protocol, but i'm not sure if they are trying to do that. Well, maybe i should go and read it >:-)