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1 Networks and network technologies you know of The Internet Wireless (802.11) DSL and cable Powerline networks RFID 3G cellular mobile phone networks (UMTS) Old-fashioned phone network Enterprise networks, data centers, ISPs Satellites, space networks This course is relevant to all these networks/technologies
2 Why we build networks Remote communication Voice, video, , text/instant messaging For people, and for computers Information sharing The Web, content distribution, social network apps Resource sharing 3D printer, dataset in the cloud To link computers and the physical world? Embedded computing/sensing, e.g., RFID
3 A Network in 461 A network is what you get anytime you connect two or more computers together by some kind of a link. OR
4 From Cool Appliances IP picture frame (wireless link) Web-enabled toaster+weather forecaster
5 To the Internet at large Internetworks = network of networks Hierarchical structure millions of connected computing devices: hosts, end-systems pc s workstations, servers PDA s phones, toasters running network apps communication links fiber, copper, radio, satellite routers:forward packets (chunks) of data thru network router server local ISP workstation mobile regional ISP company network
6 Example piece: NTT backbone
7 Model of a Network Links carry information (bits) Wire, wireless, fiber optic, smoke signals May be point-to-point or broadcast Switches move bits between links Routers, gateways, bridges, CATV headend, PABXs, Hosts are the communication endpoints PC, PDA, cell phone, tank, toaster, Hosts have names Applications make use of the network at hosts Facebook, itunes, VoIP phones, cameras, Note much other terminology: channels, nodes, intermediate systems, end systems, etc.
8 The networks we study We are interested in networks that are: Large scale Intrinsically unreliable Distributed Heterogeneous
9 The meaning of Large-scale
10 The meaning of Large scale (About 10,000 AS s)
11 The meaning of Large-scale But why build large networks?
12 Intrinsic Unreliability Information sent from a first place to a second May not arrive May arrive more than once May arrive in garbled fashion May arrive out of order May be read by others May be modified by others Why build intrinsically unreliable networks?
13 Distributed (Hopefully) independent failure modes Exposed and hidden dependencies A distributed syst em is a system in which I can t do my work because some computer has failed that I ve never even heard of. Lamport Independent administrative controls
14 Heterogeneous Networks Heterogeneous: used for and made up of different kinds of stuff (versus homogeneous, the same kind of stuff) Heterogeneous networks are harder to deal with but: They are more flexible They are inevitable. Why?
15 Goal of this Course You will understand how to design and build large, distributed computer networks. Fundamental problems Design principles Implementation technologies This is a systems course, not queuing theory, signals, or hardware design. We focus on networks, and a bit on applications or services that run on top of them. Distrib. systems You Are Here Signals Applications & services Networks Communications
16 TeraScale SneakerNet: Using Inexpensive Disks for Backup, Archiving, and Data Exchange. Jim Gray, Wyman Chong, Tom Barclay, Alex Szalay, Jan Vandenberg May 2002, Technical Report, MS-TR Table 2: The raw price of bandwidth, the true price is more than twice this when staff, router, and support costs are included. Raw prices are higher in some parts of the world. Context Speed Mbps Rent $/month Raw $/Mbps Raw $/TB sent Time/TB days home phone ,000 3,086 6 years home DSL months T , ,469 2 months T , ,010 2 days OC , hours 100 Mpbs day Gbps hours OC ,920, minutes Table 3: The relative cost of sneaker-net, using various media. The analysis assumes 6MBps tape, 10MBps CD/DVD and robots at each end to handle the media. Note that the price of media is less than the fixed robot cost. Media Robot$ Media$ TB read + write time ship time TotalTime /TB Mbps Cost (10 TB) $/TB shipped CD x hrs 24 hrs 6 days 28 $2,080 $208 DVD 200 2x hrs 24 hrs 6 days 28 $20,000 $2,000 Tape 25 2x15, hrs 24 hrs 5 days 18 $31,000 $3,100 DiskBrick 7 1,000 1, hrs 24 hrs 2 days 52 $2,600 $260
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