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Computer Networks (CS 132/EECS148) Introduction

Computer Networks (CS 132/EECS148) Introduction. Karim El Defrawy Donald Bren School of Information and Computer Science University of California Irvine. Who, Where, When (WWW). Instructor Karim El Defrawy Lectures: Thursday 6:30pm-9:20pm @ RH400

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Computer Networks (CS 132/EECS148) Introduction

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  1. Computer Networks (CS 132/EECS148)Introduction Karim El Defrawy Donald Bren School of Information and Computer Science University of California Irvine

  2. Who, Where, When (WWW) Instructor • Karim El Defrawy • Lectures: Thursday 6:30pm-9:20pm @ RH400 • Email: keldefra@uci.edu (add “CS132” to subject) • Office: CS 468A • Office Hours: Thursday 5:30-6:30pm • TA • JamshidEsmaelnezhad • Email: jesmaeln@uci.edu • Discussion Sessions: Friday12pm–1:50pm @ ICS174 • Office and Office Hours: DBH2062, Wed 1:30-2:30, Fri 2-3pm Introduction

  3. This Course IS • Your first computer networking course • A top down coverage of computer networking and the Internet • IS NOT • An advanced networking course • A queuing theory or network performance analysis course • A course to learn how to administer networks or socket/networking programming • A networking security course Introduction

  4. Required Text Book At UCI bookstore • Homework will be assigned from the book’s exercises • Most material covered in class is in book (only a couple of exceptions) • Class will follow the same top-down approach as book • Slides mainly based on those provided by Kurose/Ross Introduction

  5. Organization of Class Grading • 30% for problem sets (schedule and assignments on class website) • 20% midterm (week 5, 60 minutes in class) • 20% project (TBD) • 30% final (week 10) • Discussions Sessions will be led by TA • Time: Friday 12pm - 1:50pm • Room: ICS 174 1-5 Introduction Introduction

  6. Chapter 1: introduction our goal: get “feel” and terminology more depth, detail later in course approach: use Internet as example overview: what’s the Internet? what’s a protocol? network edge; hosts, access net, physical media network core: packet/circuit switching, Internet structure performance: loss, delay, throughput security protocol layers, service models history Introduction

  7. Chapter 1: roadmap 1.1 what is the Internet? 1.2 network edge end systems, access networks, links 1.3 network core packet switching, circuit switching, network structure 1.4 delay, loss, throughput in networks 1.5 protocol layers, service models 1.6 networks under attack: security 1.7 history Introduction

  8. What’s the Internet: “nuts and bolts” view millions of connected computing devices: hosts = end systems running network apps PC server wireless laptop smartphone wireless links wired links router mobile network global ISP home network • communication links • fiber, copper, radio, satellite • transmission rate: bandwidth regional ISP • Packet switches: forward packets (chunks of data) • routers and switches institutional network Introduction

  9. “Fun” internet appliances Web-enabled toaster + weather forecaster IP picture frame http://www.ceiva.com/ Tweet-a-watt: monitor energy use Slingbox: watch, control cable TV remotely Internet refrigerator Internet phones Introduction

  10. Internet: “network of networks” Interconnected Internet Service Providers (ISPs) Protocolscontrol sending, receiving of messages (msgs) and data e.g., TCP, IP, HTTP, Skype, 802.11 Internet standards RFC: Request for comments IETF: Internet Engineering Task Force What’s the Internet: “nuts and bolts” view mobile network global ISP home network regional ISP institutional network Introduction

  11. What’s the Internet: a service view Infrastructure that provides services to applications: Web, VoIP, email, games, e-commerce, social nets, … provides programming interface to apps hooks that allow sending and receiving app programs to “connect” to Internet provides service options, analogous to postal service mobile network global ISP home network regional ISP institutional network Introduction

  12. 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 Introduction

  13. a human protocol and a computer network protocol: Get http://www.awl.com/kurose-ross Got the time? 2:00 time What’s a protocol? Hi TCP connection request Hi TCP connection response <file> Q: other human protocols? Introduction

  14. Chapter 1: roadmap 1.1 what is the Internet? 1.2 network edge end systems, access networks, links 1.3 network core packet switching, circuit switching, network structure 1.4 delay, loss, throughput in networks 1.5 protocol layers, service models 1.6 networks under attack: security 1.7 history Introduction

  15. A closer look at network structure: network edge: hosts: clients and servers servers often in data centers mobile network global ISP home network • access networks, physical media: wired, wireless communication links regional ISP • network core: • interconnected routers • network of networks institutional network Introduction

  16. Access networks and physical media Q: How to connect end systems to edge router? residential access nets institutional access networks (school, university, company) mobile access networks keep in mind: bandwidth (bits per second) of access network? shared or dedicated? Introduction

  17. Access net: digital subscriber line (DSL) ISP voice, data transmitted at different frequencies over dedicated line to central office DSL access multiplexer central office telephone network DSL modem splitter DSLAM • use existing telephone line to central office DSLAM • data over DSL phone line goes to Internet • voice over DSL phone line goes to telephone net • < 2.5 Mbps upstream transmission rate (typically < 1 Mbps) • < 24 Mbps downstream transmission rate (typically < 10 Mbps) Introduction

  18. C O N T R O L D A T A D A T A V I D E O V I D E O V I D E O V I D E O V I D E O V I D E O 5 6 7 8 9 1 2 3 4 Channels Access net: cable network cable headend … cable modem splitter frequency division multiplexing: different channels transmitted in different frequency bands Introduction

  19. cable modem termination system data, TV transmitted at different frequencies over shared cable distribution network ISP Access net: cable network cable headend … cable modem splitter CMTS • HFC: hybrid fiber coax • asymmetric: up to 30Mbps downstream transmission rate, 2 Mbps upstream transmission rate • network of cable, fiber attaches homes to ISP router • homes share access networkto cable headend • unlike DSL, which has dedicated access to central office Introduction

  20. often combined in single box cable or DSL modem router, firewall, NAT wireless access point (54 Mbps) wired Ethernet (100 Mbps) Access net: home network wireless devices to/from headend or central office Introduction

  21. Enterprise access networks (Ethernet) institutional link to ISP (Internet) institutional router Ethernet switch institutional mail, web servers • typically used in companies, universities, etc… • 10 Mbps, 100Mbps, 1Gbps, 10Gbps transmission rates • today, end systems typically connect into Ethernet switch Introduction

  22. Wireless access networks shared wireless access network connects end system to router via base station a.k.a “access point” wide-area wireless access • provided by telco (cellular) operator, 10’s km • between 1 and 10 Mbps • 3G, 4G: LTE wireless LANs: • within building (100 ft) • 802.11b/g (WiFi): 11, 54 Mbps transmission rate to Internet to Internet Introduction

  23. Host: sends packets of data two packets, L bits each 1 2 R: link transmission rate host L (bits) R (bits/sec) time needed to transmit L-bit packet into link packet transmission delay = = host sending function: • takes application message or data • breaks into smaller chunks, known as packets, of length L bits • transmits packet into access network at transmission rate R • link transmission rate, a.k.a link capacity, a.k.a link bandwidth Introduction

  24. Physical media bit:propagates betweentransmitter/receiver pairs physical link: what lies between transmitter & receiver guided media: signals propagate in solid media: copper, fiber, coax unguided media: signals propagate freely, e.g., radio twisted pair (TP) two insulated copper wires Category 5: 100 Mbps, 1 Gpbs Ethernet Category 6: 10Gbps Introduction

  25. Physical media: coax, fiber coaxial cable: two concentric copper conductors bidirectional broadband: multiple channels on cable HFC fiber optic cable: • glass fiber carrying light pulses, each pulse a bit • high-speed operation: • high-speed point-to-point transmission (e.g., 10’s-100’s Gpbs transmission rate) • low error rate: • repeaters spaced far apart • immune to electromagnetic noise Introduction

  26. Physical media: radio signal carried in electromagnetic spectrum no physical “wire” bidirectional propagation environment effects: reflection obstruction by objects interference radio link types: • terrestrial microwave • e.g. ,up to 45 Mbps channels • LAN (e.g., WiFi) • 11Mbps, 54 Mbps • wide-area (e.g., cellular) • 3G cellular: ~ few Mbps • satellite • Kbps to 45Mbps channel (or multiple smaller channels) • 270 msec end-end delay • geosynchronous versus low altitude Introduction

  27. 1.1 what is the Internet? 1.2 network edge end systems, access networks, links 1.3 network core packet switching, circuit switching, network structure 1.4 delay, loss, throughput in networks 1.5 protocol layers, service models 1.6 networks under attack: security 1.7 history Chapter 1: roadmap Introduction

  28. mesh of interconnected routers packet-switching: hosts break application-layer messages into packets forward packetsfrom one router to the next, across links on path from source to destination each packet transmitted at full link capacity The network core Introduction

  29. Packet-switching: store-and-forward takes L/R seconds to transmit (push out) L-bit packet into link at R bps store and forward:entire packet must arrive at router before it can be transmitted on next link one-hop numerical example: L = 7.5 Mbits R = 1.5 Mbps one-hop transmission delay = 5 sec L bits per packet 1 3 2 source destination R bps R bps • end-end delay = 2L/R (assuming zero propagation delay) more on delay shortly … Introduction

  30. Packet Switching: queueing delay, loss C R = 100 Mb/s A D R = 1.5 Mb/s B E queue of packets waiting for output link queuing and loss: • If arrival rate (in bits) to link exceeds transmission rate of link for a period of time: • packets will queue, wait to be transmitted on link • packets can be dropped (lost) if memory (buffer) fills up Introduction

  31. Two key network-core functions routing:determines source-destination route taken by packets • routing algorithms forwarding:move packets from router’s input to appropriate router output routing algorithm local forwarding table header value output link 0100 0101 0111 1001 3 2 2 1 1 0111 2 3 dest address in arriving packet’s header Introduction

  32. Alternative core: circuit switching end-end resources allocated to, reserved for “call” between source & dest: In diagram, each link has four circuits. call gets 2nd circuit in top link and 1st circuit in right link. dedicated resources: no sharing circuit-like (guaranteed) performance circuit segment idle if not used by call (no sharing) Commonly used in traditional telephone networks Introduction

  33. Circuit switching: FDM versus TDM Example: 4 users FDM frequency time TDM frequency time Introduction

  34. Packet switching versus circuit switching example: 1 Mb/s link each user: 100 kb/s when “active” active 10% of time circuit-switching: 10 users packet switching: with 35 users, probability > 10 active at same time is less than .0004 * packet switching allows more users to use network! Q: how did we get value 0.0004? Q: what happens if > 35 users ? N users ….. 1 Mbps link * Check out the online interactive exercises for more examples Introduction

  35. great for bursty data resource sharing simpler, no call setup excessive congestion possible: packet delay and loss protocols needed for reliable data transfer, congestion control Q: How to provide circuit-like behavior? bandwidth guarantees needed for audio/video apps still an unsolved problem (chapter 7) is packet switching a “slam dunk winner?” Packet switching versus circuit switching Q: human analogies of reserved resources (circuit switching) versus on-demand allocation (packet-switching)? Introduction

  36. Internet structure: network of networks • End systems connect to Internet via access ISPs (Internet Service Providers) • Residential, company and university ISPs • Access ISPs in turn must be interconnected. • So that any two hosts can send packets to each other • Resulting network of networks is very complex • Evolution was driven by economics and national policies • Let’s take a stepwise approach to describe current Internet structure Introduction

  37. Internet structure: network of networks Question: given millions of access ISPs, how to connect them together? … … … … access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net … … Introduction

  38. Internet structure: network of networks Option: connect each access ISP to every other access ISP? … … … … connecting each access ISP to each other directly doesn’t scale: O(N2) connections. … … … … access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net … … … Introduction

  39. Internet structure: network of networks Option: connect each access ISP to a global transit ISP? Customer and provider ISPs have economic agreement. … … … … globalISP access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net … … Introduction

  40. Internet structure: network of networks But if one global ISP is viable business, there will be competitors …. … … ISP B ISP A ISP C … … access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net … … Introduction

  41. Internet structure: network of networks But if one global ISP is viable business, there will be competitors …. which must be interconnected Internet exchange point … … ISP B ISP C ISP A IXP IXP … … access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net peering link … … Introduction

  42. Internet structure: network of networks … and regional networks may arise to connect access nets to ISPS … … ISP B ISP C ISP A IXP IXP … … access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net regional net … … Introduction

  43. Internet structure: network of networks … and content provider networks (e.g., Google, Microsoft, Akamai ) may run their own network, to bring services, content close to end users … … ISP B ISP B ISP A IXP IXP … … Content provider network access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net access net regional net … … Introduction

  44. Internet structure: network of networks at center: small # of well-connected large networks “tier-1” commercial ISPs(e.g., Level 3, Sprint, AT&T, NTT), national & international coverage content provider network (e.g., Google): private network that connects its data centers to Internet, often bypassing tier-1, regional ISPs Tier 1 ISP Tier 1 ISP Google IXP IXP IXP Regional ISP Regional ISP access ISP access ISP access ISP access ISP access ISP access ISP access ISP access ISP Introduction

  45. Tier-1 ISP: e.g., Sprint POP: point-of-presence to/from backbone peering … … … … … to/from customers Introduction

  46. Chapter 1: roadmap 1.1 what is the Internet? 1.2 network edge end systems, access networks, links 1.3 network core packet switching, circuit switching, network structure 1.4 delay, loss, throughput in networks 1.5 protocol layers, service models 1.6 networks under attack: security 1.7 history Introduction

  47. How do loss and delay occur? packets queue in router buffers packet arrival rate to link (temporarily) exceeds output link capacity packets queue, wait for turn packet being transmitted (delay) packets queueing(delay) free (available) buffers: arriving packets dropped (loss) if no free buffers A B Introduction

  48. Four sources of packet delay dproc: nodal processing check bit errors determine output link typically < msec transmission A propagation B nodal processing queueing dnodal = dproc + dqueue + dtrans + dprop dqueue: queueing delay • time waiting at output link for transmission • depends on congestion level of router Introduction

  49. dtrans and dprop very different Four sources of packet delay transmission A propagation B nodal processing queueing dnodal = dproc + dqueue + dtrans + dprop dprop: propagation delay: • d: length of physical link • s: propagation speed in medium (~2x108 m/sec) • dprop = d/s dtrans: transmission delay: • L: packet length (bits) • R: link bandwidth (bps) • dtrans= L/R * Check out the Java applet for an interactive animation on trans vs. prop delay Introduction

  50. Caravan analogy cars “propagate” at 100 km/hr toll booth takes 12 sec to service car (bit transmission time) car~bit; caravan ~ packet Q: How long until caravan is lined up before 2nd toll booth? time to “push” entire caravan through toll booth onto highway = 12*10 = 120 sec time for last car to propagate from 1st to 2nd toll both: 100km/(100km/hr)= 1 hr A: 62 minutes 100 km 100 km ten-car caravan toll booth toll booth Introduction

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