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Network Programming: Syllabus

Network Programming: Syllabus. Spring 2009, Prof. Kihyun Pyun. Evolution of Data Communication Networks (1). A key motivation A typical key cost : communication media installation cost Equipments are relatively cheap!. Evolution of Data Communication Networks (2).

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Network Programming: Syllabus

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  1. Network Programming:Syllabus Spring 2009, Prof. Kihyun Pyun

  2. Evolution of Data Communication Networks (1) • A key motivation • A typical key cost : communication media installation cost • Equipments are relatively cheap!

  3. Evolution of Data Communication Networks (2) • If a new technology requires a new network infrastructure, reconsider it! • Is it worth for investing a BIG money? • As an example, think about the video conferencing technologies in 1970s • xDSLtechnologies are good examples for success

  4. Evolution of Data Communication Networks (3) • Due to a tremendous initial investment for a network backbone infrastructure • traditionally telecommunication companies leads the trend • E.g., FrameRelay, ATM (Asynchronous Transfer Mode), … • existing infrastructures are reused as much as possible • However, equipments can be replaced more easily than transmission media

  5. Evolution of Data Communication Networks (4) 인터넷 망 전체 구조 고비용, 기존망 활용 인터넷 서비스 제공자 (ISP) WAN 라우터 가정망 PC (케이블 모뎀, xDSL,etc) ISP 노트북 서버 회사망 무선 AP 저비용, 이더넷 LAN

  6. Evolution of Data Communication Networks (5) • An example

  7. Evolution of Data Communication Networks (6) • Another example

  8. Figure 16.1Connecting devices

  9. Figure 16.2Repeater

  10. Figure 16.3Function of a repeater

  11. Figure 16.4Hubs Dummy hub : multi-port repeater

  12. Figure 16.12Star backbone

  13. Residential access: cable modems Introduction Diagram: http://www.cabledatacomnews.com/cmic/diagram.html

  14. Cable Network Architecture: Overview Typically 500 to 5,000 homes cable headend home cable distribution network (simplified) Introduction

  15. Cable Network Architecture: Overview cable headend home cable distribution network (simplified) Introduction

  16. server(s) Cable Network Architecture: Overview cable headend home cable distribution network Introduction

  17. 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 Cable Network Architecture: Overview FDM: cable headend home cable distribution network Introduction

  18. A short history Evolution of Data Communication Networks (6) Telegraphic communication Telephone networks Telephone and Data networks ISDN (Integrated Services Digital Network) B-ISDN (Broadband ISDN) Message Voice Voice, data Voice, video, data Voice, video, data Internet Winner? ALL IP ?! Data, voice by VoIP, video Digital wireless communications GSM CDMA CDMA2000, HSDPA, … Analog wireless communications Voice Voice Voice, data Voice, video, data Voice

  19. 프로토콜 스택 (Protocol Stack) • 다양한 통신선과 장비가 서로 통신할 수 있도록 정한 규약들 • 전화선, 동선, 광케이블 등 • 국제 표준화가 필요 • Layering을 통해 복잡성을 줄임 • 하위 계층의 기능을 상위 계층에서 활용

  20. ISO의 OSI reference model • OSI (Open Systems Interconnection) reference model • ISO에서 만듦 • 7 계층 • 참고 모델일 뿐! Application Presentation Session Transport Network Data Link Physical

  21. application: supporting network applications FTP, SMTP, STTP transport: host-host data transfer TCP, UDP network: routing of datagrams from source to destination IP, routing protocols link: data transfer between neighboring network elements PPP, Ethernet physical: bits “on the wire” application transport network link physical Internet protocol stack Introduction

  22. M M H H H H H H H H H H H H t n t n t n t l l t n t M M M M application transport network link physical application transport network link physical M M Protocol layering and data 스택구조로 사용 먼저 넣은 것이 가장 늦게 나옴 Each layer takes data from above • adds header information to create new data unit • passes new data unit to layer below source destination message segment datagram frame Introduction

  23. 토론 마당 • 새로운 선, 예들 들면 USB 선에 연결된 마우스를 인터넷에서 접속하는 것이 가능할까? 어떻게? • 혹은 CDMA망에 인터넷은 어떻게? TCP IP CDMA CDMA Physical Physical

  24. 프로토콜 예제 TCP/IP TCP/IP TCP/IP TCP/IP TCP/IP TCP/IP Ethernet Ethernet X.25/… X.25/… WCDMA/Wibro WCDMA/Wibro UTP UTP Coaxial Coaxial Wireless channel Wireless channel 하부망 특정 프로토콜 (예: ARP, RARP) 하부망 특정 프로토콜 (예: 기지국 찾기, …) 네트워크 프로그래밍은 넓은 관점에서는 위의 모든 프로토콜 영역에 적용할 수 있어야 함. 그러나 하부망 특정 프로토콜 영역은 (소켓프로그래밍에서 Raw 패킷 ) 이 과목에서 주로 다루지 않음

  25. 고려해야 할 프로토콜들 • TCP • 오류없는 데이터 전송 보장 • UDP • 효율적인 데이터 전송 (패킷 소실 가능) • 응용 프로토콜 • FTP, Telnet, … OSPF FTP HTTP RIP TCP UDP IP

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