上海交通大学：《通信网络》课程PPT教学课件（Communication Networks）Introduction（主讲：叶通）

复法 票 Shanghai Jiao Tong University INTRODUCTION

Communication Networks INTRODUCTION Shanghai Jiao Tong University

Course syllabus TOPICS Introduction Automatic Repeat re Quest(arQ) 2345678 Little's law M/M/1. M/M/m and other Systems Burke's Theorem and network of queues Queueing M/G/I Queueing and its applications Reservation and priority queues AlOhA and CSMa Seminar Unicast Switching Switching Multicast switching 12 Seminar Shortest Path routing 14 routing Multicast routing 15 Presentations

Communication Networks Course syllabus 3 TOPICS 1 Introduction 2 Automatic Repeat reQuest (ARQ) 3 Queueing Little’s Law 4 M/M/1, M/M/mand Other Systems 5 Burke's Theorem and network of queues 6 M/G/1 Queueing and its Applications 7 Reservation and priority queues 8 ALOHA and CSMA 9 Seminar 10 Switching Unicast Switching 11 Multicast Switching 12 Seminar 13 Routing Shortest Path Routing 14 Multicast Routing 15 Presentations

Outline Why need networks History of Networks Network Classification Layered Network Model

Communication Networks Outline • Why need networks • History of Networks • Network Classification • Layered Network Model 4

Why do we Need Networks? Communication demand Telephone call, On-line games, Video on demand, On-line shopping, 电儿量 淘 娅 同巴因下生活通 ②的⊙

Communication Networks Why do We Need Networks? • Communication Demand – Telephone call, On-line games, Video on demand, On-line shopping, … 5

Network applications E-mail · World wide Web · Remote access · Collaboration File sharing(ftp, btec Streaming(PPlive, IPTV etc) Voice telephony(VolP, skype And much more

Communication Networks Network Applications • E-mail • World Wide Web • Remote access • Collaboration • File sharing (FTP, BT etc) • Streaming (PPLive, IPTV etc) • Voice telephony (VoIP, skype) • And much more…. 6

How about full connections? o(n connections, where N is number of users Cost and complexity are terribly large

Communication Networks How about Full Connections? • 𝑂 𝑁 2 connections, where 𝑁 is number of users – Cost and complexity are terribly large 7

What are Networks? All the users share the same network, including a set of Nodes. Links. protocols Users can obtain a set of resources to support their communications when they need

Communication Networks What are Networks? • All the users SHARE the same network, including a set of: – Nodes, Links, Protocols • Users can obtain a set of resources to support their communications when they need 8

Outline Why need networks History of Networks Network Classification Layered Network Model

Communication Networks Outline • Why need networks • History of Networks • Network Classification • Layered Network Model 9

History of Internet 1966, national physical lab(nPl)network in England A local area network (LAN pioneered the concept of packet switching 1969. interconnection of two nodes later became arpanet 1972, emergence of 1OMbps Ethernet (Lan), which is widely used today 1974. TCP/IP Protocol became an rfc and the first use of term“ Internet 1978, invention ofE-Mail by a 14-year-old boy named V.a Shiva ayyadurai 1982, IEEE 802 Standard Family

Communication Networks History of Internet • 1966, national physical lab (NPL) network in England – A local area network (LAN) – pioneered the concept of packet switching • 1969, interconnection of two nodes, later became ARPANET • 1972, emergence of 10Mbps Ethernet (LAN), which is widely used today • 1974, TCP/IP Protocol became an RFC and the first use of term “Internet” • 1978, invention of E-MAIL by a 14-year-old boy named V. A. Shiva Ayyadurai • 1982, IEEE 802 Standard Family 10

History of Internet(cont) 1983, first TCP/IP based wide-area network started to operate (Pv4) 1984, open system interconnection(OSi) standardized by International Organization for Standardization (iso) 1991, Www was publicized at CErN (European Organization for Nuclear Research) 1994. Chinese connected to Internet 1995, IPv6 released by Ietf (Internet Engineering Task Force) 1998, IG-Ethernet(applied to metro area networks 2003, China Next Generation Internet(CNGI, IPv6 network) Tencent Taobao

Communication Networks History of Internet (cont’) • 1983, first TCP/IP based wide-area network started to operate (IPv4) • 1984, open system interconnection (OSI) standardized by International Organization for Standardization (ISO) • 1991, WWW was publicized at CERN (European Organization for Nuclear Research) • 1994, Chinese connected to Internet • 1995, IPv6 released by IETF (Internet Engineering Task Force) • 1998, 1G-Ethernet (applied to metro area networks) • 2003, China Next Generation Internet (CNGI, IPv6 network) • … Tencent, Taobao, … 11