Comment by redleader55

> QUIC goes significantly up the OSI network stack, is layer 5+, where-as TCP+TLS is layer 3

IP is layer 3 - network(ensures packets are routed to the correct host). TCP is layer 4 - transport(some people argue that TCP has functions from layer 5 - eg. establishing sessions between apps), while TLS adds a few functions from layer 6(eg. encryption), which QUIC also has.