The type of connectivity used can range from a single channel ISDN line to multiple DS-3 connections.
Connectivity is just as important as servers used.
Without enough bandwidth to serve all clients, all other features are useless and therefore unimportant. In summary, you should never host your website on any connection less than a full T-1 line without redundancy. What this means is that BGP, when presented a number of options to route traffic, will send the outbound traffic through the providers who have shortest path between the network and the destination. This is very advantageous because the overall effect is that our clients experience faster access times to their website, since the best route from server to client is always used. Net utilizes 4 separate DS-3 connections to diverse Internet carriers.