What is Computer network? A serials of computers 大公司(大公司)(地区IS 网络接入点 网络接入点 NAP 主干服务 NAP (对等点 提供者 对等点) 地区|SP 大公司地区sP她地区|SP 本地SP本地SP 公司)(地S 园网《校园(校园网(校园威(校园 erfeng Computer network-Introduction 18/87
Introduct by Weifeng Sun Computer network-Introduction 18/87 What is Computer network? • A serials of computers. 大公司 地区 ISP 网络接入点 NAP （对等点） 公司 校园网 主干服务 提供者 校园网 校园网 校园网 校园网 本地 ISP 地区 ISP 地区 ISP 地区 ISP 本地 ISP 本地 ISP 大公司 大公司 网络接入点 NAP （对等点）
What's the Internet: "nuts and bolts"vi& PC millions of connected mobile network computing devices Global isp wireless hosts = end systems atop cellular running network handheld apps Home network communication / inks Relgiona) ISP access fiber, copper, radio points satellite stitutional network wired links fransmission rate bandwidth routers: forward 中 packets(chunks of data erfeng Computer network-Introduction 19/87
Introduct by Weifeng Sun Computer network-Introduction 19/87 What’s the Internet: “nuts and bolts” view • millions of connected computing devices: hosts = end systems – running network apps Home network Institutional network Mobile network Global ISP Regional ISP router PC server wireless laptop cellular handheld wired links access points • communication links – fiber, copper, radio, satellite – transmission rate = bandwidth • routers: forward packets (chunks of data)
What's the Internet: nuts and bolts"vi protocols control sending Mobile network eceiving of msas Global isp e.g., Tcp, Ip, Http, Skype Ethernet Internet:"network of Home network networks Relgiona) ISP loosely hierarchical ublic Internet versus stitutional network private intranet Internet standards RFC: Request for comments 中 F: Internet Engineering ask Force erfeng Computer network-Introduction 20/87
Introduct by Weifeng Sun Computer network-Introduction 20/87 What’s the Internet: “nuts and bolts” view • protocols control sending, receiving of msgs – e.g., TCP, IP, HTTP, Skype, Ethernet • Internet: “network of networks” – loosely hierarchical – public Internet versus private intranet • Internet standards – RFC: Request for comments – IETF: Internet Engineering Task Force Home network Institutional network Mobile network Global ISP Regional ISP
What's a protocol? human protocols: network protocols: what's the time? machines rather than i have a question humans introductions · all communication activity in Internet specific msgs sent governed by protocols specific actions taken protocols define format, when msas received order of msgs sent and or other events received among network entities and actions taken on msg transmission, receipt erfeng Computer network-Introduction 21787
Introduct by Weifeng Sun Computer network-Introduction 21/87 What’s a protocol? human protocols: • “what’s the time?” • “I have a question” • introductions … specific msgs sent … specific actions taken when msgs received, or other events network protocols: • machines rather than humans • all communication activity in Internet governed by protocols protocols define format, order of msgs sent and received among network entities, and actions taken on msg transmission, receipt
What's a protocol? a human protocol and a computer network protocol TCP connection reques TCP connection Got the response time? Gethttp://wwwawl.com/kurose-ross 2:00 e fime Q: Other human protocols erfeng omputer network -Introduction 22/87
Introduct by Weifeng Sun Computer network-Introduction 22/87 What’s a protocol? a human protocol and a computer network protocol: Q: Other human protocols? Hi Hi Got the time? 2:00 TCP connection request TCP connection response Get http://www.awl.com/kurose-ross <file> time