FIG. 2 provides further details of the POP 130 of FIG. 1. As shown, the client computers 102 are coupled to the POP 130 through the Internet 210. The POP 130 includes one or more racks of host server computers 230, 232. Each rack 230, 232 can include a switch 234, 236 (e.g., a top-of-rack switch) coupled to multiple host server computers. Each rack is a separate domain, shown as domain 1 (250) through domain N (252)(where N is any positive integer number). A particular host server computer 289 is shown in an expanded view at 260. The host 289 has underlying hardware 262 including one or more CPUs, memory, storage devices, etc. Running a layer above the hardware 262 is a kernel layer 264. A user space 266 is an application layer and any desired applications can be executing in conjunction with the kernel layer 264 and hardware 262.
