1. 1 Pertemuan 7 Communication Protocols for E-Business Matakuliah: M0284/Teknologi & Infrastruktur E-Business Tahun: 2005 Versi: >

2. 2 Learning Objectives Explain the idea of a protocol Describe the OSI model of communication protocol Point out important features of the TCP/IP protocol suite

3. 3 Overview What is a protocol? The Open Systems Interconnection Model Understanding the Internet The Internet Protocol Suite

4. 4 What is a Protocol? Rules of communication Communication consists of small acts Protocols formalize the notion of acts Protocols relate to other protocols in terms of layers

5. 5 Protocol Layers Different functions in a post-office based communication system

6. 6 Open Systems Interconnection Model

7. 7 OSI Model Layer 0: The physical media Layer 1, Physical: Specifications related to transfer of data bits. Modulation techniques, voltages, interfaces Layer 2, Datalink: Specs related to delivery of frames across two adjacent nodes. Sending and receiving of frames from the media, frame structure, addressing

8. 8 The OSI Model Layer 3, Network: Specs relating to sending message over the entire network routing, congestion control

9. 9 The OSI Model Layer 4, Transport: Ensure end-to-end delivery function executed at the sender and recipient end

10. 10 The OSI Model Layer 5, Session: establish, maintain and terminate session Layer 6, Presentation: data representation, encryption Layer 7, Application: network application, user interface

11. 11 The Internet Data Centric network Separation of Communication and data processing between 2 computers, one called host and the other router Packet Switched Network

12. 12 The Internet: Packet Switching Packets travel from sending host to destination host. Along the way the packets are routed from one router to another

13. 13 The Internet: Network connecting other networks A simplified view of the Internet

14. 14 The Internet: The Network Networks owned by different governments and organizations Consists of different levels of backbone national level, regional level The backbones are owned and operated by different Internet service providers and governments The backbone meet at network access points and metropolitan area exchanges

15. 15 Internet Service Provider

16. 16 Connecting to an ISP

17. 17 Internet Protocol Suite Developed independently of OSI Can be mapped to OSI model Layer 3, network layer: IP, Internet protocol Layer 4, transport layer: TCP, transmission control protocol Layer 7, application: FTP, HTTP

18. 18 The Internet Protocol Suite

19. 19 Internet Protocol Internet addressing 32 bit Internet address: 1000000100011111 10000001 00011111 is written as 129.31.129.31 Domain name addressing domain name servers translates an address chaudhury.mis.mgmt.edu to the above IP address Different domains: edu, gov, com, mil, net New domains: biz, pro, cop, museum, aero, name

20. 20 Domain Server Tree

21. 21 IP Routing Routing tables at each router specify for the packet destination address the network address that the packet is to be routed to

22. 22 Transmission Control Protocol Fulfills the functions of Layer 4, transport layer ensures end-to-end delivery Breaks data stream from the application layer into packets (IP datagrams) Uses a system of acknowedgement-with- retransmission paradigm