Get introduced to the basics of Communication Protocols and understand how TCP/IP works

3. The OSI Model Lower Layer connects one node to another Upper Layer directly assist the user 7 Application 6 Presentation 5 Session 4 Transport 3 Network 2 Data Link 1 Physical Layer Function Network Choosing the next node and the link to it Data Link Controls the flow of messages on the chosen link Physical Connecting to the physical medium that provides the link Layer Function Application Provides services directly to an application program Presentation Presentation of information to user in a format that the user will understand Session Controls the user to user dialogue – its direction and synchronization Transport Raises the quality of service provided by the network to the level required by user

4. The Internet Protocol Suite Fiber Telnet DNS UDP TCP IP Ethernet Wi-Fi Co-ax HTTP Radio Application Transport Network Link Physical

19. Unicast, Broadcast, Multicast Unicast One sender – one receiver Broadcast Sends data to all possible receivers Multicast Sends data to interested receivers Applications of IP Multicast: Pay TV File Transfer Financial Information But is complex to implement