1. Mr C Johnston ICT Teacher www.computechedu.co.uk BTEC IT Unit 09 - Lesson 04 Application Layer Protocols

2. Session Objectives Be able to describe a range of different protocols accessed by the application layer of the TCP/IP model, Be able to give practical examples of how the different application layer protocols are used by network users.

3. OSI Model Application Network Presentation Data Link Session Transport Physical

4. TCP/IP Model The TCP/IP (transport control protocol / internet protocol) cuts the 7 layers of the OSI model down to 4, The protocol allows data packets to be routed and allows intercommunication between LANs and WANs, All communication on the internet makes use of the TCP/IP protocol. Transport Network Application Link

5. TCP/IP Protocols The TCP/IP protocol suite has an extensive range of protocol in common use on a LAN. OSI LayersCommon TCP/IP Protocols 7ApplicationFTPHTTPPOP3SMTP 6Presentation 5SessionDNS 4TransportTCPUDP 3NetworkIPICMPDHCP 2Data LinkARPRARP 1Physical

6. Application Layer Protocols You need to be able to describe a range of different application layer protocols including: HTTP, FTP, SMPT, DNS, DHCP.

7. BTEC Book – Unit 09 p10 BTEC Book – Unit 10 p14-17