What's the Internet:"nuts and bolts"view X protocols control sending, router 珍 workstation receiving of msgs 目server 区 e.g.,TCP,IP,HTTP,FTP,PPP mobile Internet:"network of eal ISP networks" Loosely(宽松的)hierarchical public Internet versus private intranet(内联网) ▣Internet standards RFC:Request for comments IETF:Internet Engineering Task Force(因特网工程任务组) company network Introduction 1-6Introduction 1-6 What’s the Internet: “nuts and bolts” view ❑ protocols control sending, receiving of msgs ❖ e.g., TCP, IP, HTTP, FTP, PPP ❑ Internet: “network of networks” ❖ Loosely（宽松的） hierarchical ❖ public Internet versus private intranet（内联网） ❑ Internet standards ❖ RFC: Request for comments ❖ IETF: Internet Engineering Task Force（因特网工程任务组） local ISP company network regional ISP router workstation server mobile