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ppt

  1. 1. CS4514 Computer Networks Term B08 Professor Bob Kinicki Networks: Introduction
  2. 2. Course Objectives Networks: Introduction
  3. 3. Course Objectives <ul><li>To develop an understanding of modern network architectures from a design and performance perspective. </li></ul><ul><li>To introduce the student to the major concepts involved in wide-area networks (WANs), local area networks (LANs), Wireless LANs (WLANs) and Wireless Sensor Networks (WSNs). </li></ul><ul><li>3. To clarify network terminology. </li></ul>Networks: Introduction
  4. 4. Course Objectives <ul><li>4. To provide an opportunity to do network programming using TCP/IP . </li></ul><ul><li>5. To give the students experience working in programming teams. </li></ul><ul><li>To provide a WLAN performance evaluation experience. </li></ul><ul><li>To expose students to emerging technologies and their potential impact. </li></ul>Networks: Introduction
  5. 5. Introduction Networks: Introduction
  6. 6. Network Definitions and Classification <ul><li>Preliminary definitions and network terminology </li></ul><ul><li>Sample application paradigms </li></ul><ul><li>Classifying networks by transmission technology </li></ul><ul><li>Classifying networks by size (or scale) </li></ul><ul><li>Classifying networks by topology </li></ul>Networks: Introduction
  7. 7. Preliminary Definitions <ul><li>computer network :: [Tanenbaum] a collection of “autonomous” computers interconnected by a single technology. </li></ul><ul><ul><li>[LG&W] communications network ::a set of equipment and facilities that provide a service. </li></ul></ul><ul><li>In a distributed system the collection of independent computers appears to its users as a single coherent system. </li></ul>Networks: Introduction
  8. 8. Client-Server Applications <ul><li>Figure 1.1 A network with two clients and one server. </li></ul>Networks: Introduction
  9. 9. Client-Server Model <ul><li>Figure 1-2. The client-server model involves requests and replies. </li></ul>Networks: Introduction
  10. 10. Peer-to-Peer Applications <ul><li>Figure 1.3 In a peer-to-peer system there are no fixed clients and servers. </li></ul>Networks: Introduction
  11. 11. Mobile Network Users <ul><li>Figure 1-5. Combinations of wireless networks and mobile computing. </li></ul>Networks: Introduction
  12. 12. Networks: Introduction 12 1 11 8 4 7 2 6 9 10 14 5 13 15 3 Host B Host C Host L Host D Host E Host G Host J Host A Host H Host F Host M 16 17 W T X Y Z nodes AP W1 W2 W3 W4
  13. 13. Networks: Introduction K & R
  14. 14. Classifying Networks by Transmission Technology <ul><li>broadcast :: a single communications channel shared by all machines (addresses) on the network. Broadcast can be both a logical or a physical concept (e.g. Media Access Control (MAC) sublayer ) . </li></ul><ul><li>multicast :: communications to a specified group. This requires a group address (e.g. – multimedia multicast). </li></ul><ul><li>unicast :: a communication involving a single sender and a single receiver. </li></ul><ul><li>point-to-point :: connections made via links between pairs of nodes. </li></ul>Networks: Introduction
  15. 15. Network Classification by Size <ul><li>Figure 1-6. Classification of interconnected processors by scale. </li></ul>Networks: Introduction
  16. 16. Network Classification by Size <ul><li>LANs {Local Area Networks} </li></ul><ul><ul><li>Wired LANs: typically physically broadcast at the MAC layer (e.g., Ethernet, Token Ring) </li></ul></ul><ul><ul><li>Wireless LANs (WLANs) </li></ul></ul><ul><ul><li>Wireless Sensor Networks (WSNs) </li></ul></ul><ul><li>MANs {Metropolitan Area Networks } </li></ul><ul><ul><li>campus networks connecting LANs logically or physically. </li></ul></ul><ul><ul><li>often have a backbone (e.g., FDDI and ATM) </li></ul></ul>Networks: Introduction
  17. 17. Networks: Introduction Ethernet bus Ethernet hub transceivers       Figure 1.17 Leon-Garcia & Widjaja: Communication Networks Copyright ©2000 The McGraw Hill Companies Wired LANs
  18. 18. Wireless LANs (WLANs) <ul><li>Figure 1-35. (a) Wireless networking with a base station. (b) Ad hoc networking. </li></ul>Networks: Introduction
  19. 19. Metropolitan Area Networks <ul><li>Figure 1-8. A metropolitan area network based on cable TV. </li></ul>Networks: Introduction
  20. 20. Networks: Introduction Metropolitan network A consists of access subnetworks a, b, c, d. National network consists of regional subnetworks  . Metropolitan network A is part of regional subnetwork  . A Hierarchical Network Topology 1* a c b d  2 3 4   Figure 1.8 Copyright ©2000 The McGraw Hill Companies Leon-Garcia & Widjaja: Communication Networks MAN A
  21. 21. Network Classification by Size <ul><li>WANs {Wide Area Networks} </li></ul><ul><ul><li>also referred to as “point-to-point” networks. </li></ul></ul><ul><ul><li>ARPANET  Internet </li></ul></ul><ul><ul><li>usually hierarchical with a backbone. </li></ul></ul><ul><ul><li>Enterprise Networks, Autonomous Systems </li></ul></ul><ul><ul><li>VPNs (Virtual Private Networks). </li></ul></ul>Networks: Introduction
  22. 22. Networks: Introduction UCLA RAND TINKER USC NBS UCSB HARV SCD BBN STAN AMES AMES McCLELLAN UTAH BOULDER GWC CASE CARN MITRE ETAC MIT ILL LINC RADC Figure 1.16 ARPAnet circa 1972 a point-to-point network Leon-Garcia & Widjaja: Communication Networks Copyright ©2000 The McGraw Hill Companies
  23. 23. Wide Area Networks (WANs) <ul><li>Figure 1-10.A stream of packets from sender to receiver. </li></ul>Networks: Introduction
  24. 24. Networks: Introduction G G G G G net 1 net 2 net 3 net 4 net 5 G = gateway Figure 1.18 Leon-Garcia & Widjaja: Communication Networks Copyright ©2000 The McGraw Hill Companies internet - a network of networks G
  25. 25. Network Classification by Topology Networks: Introduction flow of data Repeater Bus Bidirectional flow assumes baseband cable
  26. 26. Network Classification by Topology Networks: Introduction Repeater Repeater Ring Note - a ring implies unidirectional flow
  27. 27. Network Classification by Topology <ul><li>Headend </li></ul>Networks: Introduction Tree
  28. 28. Network Classification by Topology Networks: Introduction Star hub, switch or repeater
  29. 29. Network Classification by Topology Networks: Introduction Star AP W1 W2 W3 W4 Wireless Infrastructure

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