osi<-> Network Software Although this course is about network programming(and not about networking general), an understanding of a complete network model is essential CSIE NTUT TANAN
CSIE, NTUT, TAIWAN 11 OSI <-> Network Software Although this course is about network programming (and not about networking in general), an understanding of a complete network model is essential
OSI 7 Layer Model 7 Application 6 Presentation High level protocols 5 Session 4 Transport 3 Network 2 Data-Link 1 Physical Low level protocols CSIE NTUT TANAN
CSIE, NTUT, TAIWAN 12 OSI 7 Layer Model 7 Application 6 Presentation 5 Session 4 Transport 3 Network 2 Data-Link 1 Physical High level protocols Low level protocols
Simplified network model Process Process Interface Protocols Transport Transport Peer-to-peer Protocols Network Network Data link Data link CSIE NTUT TANAN
CSIE, NTUT, TAIWAN 13 Simplified Network Model Process Transport Network Data Link Process Transport Network Data Link Interface Protocols Peer-to-peer Protocols
Process +l cess Interface Protocols Interface and Transport Transport Peer-to-pe Protocols Peer-to-peer Network Network Protocols /Data Link Data link Interface protocols describe the communication between layers on the same endpoint Peer-to-peer protocols describe communication between peers at the same layer CSIE NTUT TANAN
CSIE, NTUT, TAIWAN 14 Interface and Peer-to-peer Protocols • Interface protocols describe the communication between layers on the same endpoint. • Peer-to-peer protocols describe communication between peers at the same layer. Process Transport Network Data Link Process Transport Network Data Link Interface Protocols Peer-to-peer Protocols
OSI layers Device Device A B Intermediate Intermediate node node Peer-to-peer protocol(7th layer) plication Application 7-6 interface 7-6 interface Peer-to-peer protocol (6th layer) Presentation Presentation 6-5 interface 1 6-5 interface Session Peer-to-peer protocol (5th layer) sSion 5-4 interface 5-4 interface Peer-to-peer protocol(4th layer Transport Transport 4-3 interface 4-3 interface 3rd 3rd 3rd Network Network Networ Network 3-2 interface 3-2 interface 2nd 2r 2nd Data link x Data link Data link K Data link 2-1 interface 2-1 interface lst lst I st Physical Physica Physical Physical Physical communication CSIE NTUT TANAN Figure 2-2
CSIE, NTUT, TAIWAN 15 Figure 2-2 OSI layers