1. Institute of Technology Sligo - Dept of Computing Another Model?! The TCP/IP Reference Model Paul Flynn

2. Institute of Technology Sligo - Dept of Computing A Bit of History  The TCP/IP Model was develop by the Department of Defense in the late 60s’ to ensure data communications would not be interrupted even under the worse circumstances.  Since then, TCP/IP has become the de facto method we use for data communications on the Internet.

3. Institute of Technology Sligo - Dept of Computing The Four Layers of TCP/IP Application Includes all the functions of the OSI’s Application, Presentation, & Session layers including: Data representation Data encryption and Dialog control

4. Institute of Technology Sligo - Dept of Computing The Four Layers of TCP/IP Application Transport Uses the TCP protocol and is responsible for quality of service issues including: Reliability Flow Control and Error Correction

5. Institute of Technology Sligo - Dept of Computing The Four Layers of TCP/IP Application Transport Internet Uses the IP protocol and is responsible for: Path determination and Packet switching.

6. Institute of Technology Sligo - Dept of Computing The Four Layers of TCP/IP Application Transport Network Access Internet Includes all the functions of the OSI’s Data Link & Physical layers including: processes required by IP to ensure a packet reaches its destination. all the various LAN & WAN Technologies such as 100BaseTX & Frame Relay.

7. Institute of Technology Sligo - Dept of Computing Protocols For Each Layer  FTP-File Transfer Protocol  HTTP-Hypertext Transfer Protocol  SMTP-Simple Mail Transfer Protocol  DNS-Domain Name Service  TFTP-Trivial File Transfer Protocol Application

8. Institute of Technology Sligo - Dept of Computing Protocols For Each Layer  TCP-Transmission Control Protocol  UDP-User Datagram Protocol Transport Application

9. Institute of Technology Sligo - Dept of Computing Protocols For Each Layer  IP-Internet Protocol Internet Transport Application

10. Institute of Technology Sligo - Dept of Computing Protocols For Each Layer  LAN & WAN Technologies Network Access Internet Transport Application

11. Institute of Technology Sligo - Dept of Computing Application Transport Network Access Internet TCP/IP OSI Application Presentation Session Transport Network Data Link Physical

12. Institute of Technology Sligo - Dept of Computing Why Two Models!!  TCP/IP is the most popular “protocol specific” model used on the Internet.  However, TCP/IP does not cover all the protocols and standards we will be exploring.  The OSI Model is “protocol independent.” Therefore, all topics covered in the curriculum can fit into its framework.

13. Institute of Technology Sligo - Dept of Computing What To Know For The Test  The OSI Model’s layers & their key characteristics and functions.  The process of data encapsulation and the various PDUs.  The TCP/IP layers and its corresponding protocols.  Comparison of the two model’s layers.