Energy In Informatics Exercise 08 Networking ISO/OSI Reference - PowerPoint PPT Presentation

Energy In Informatics Exercise 08 Networking

ISO/OSI Reference model • 7. Application • Data transmission, e-mail, terminal, remote login • 6. Presentation • System-dependent presentation of the data (EBCDIC / ASCII) • 5. Session • start, end, restart • 4. Transport • Segmentation, congestion • 3. Network • Routing • 2. Data Link • Checksums, flow control • 1. Physical • Mechanics, electrics 2

ISO/OSI Reference model • 7. Application • Data transmission, e-mail, terminal, remote login • 6. Presentation Data • System-dependent presentation of the data (EBCDIC / ASCII) • 5. Session • start, end, restart Segments • 4. Transport • Segmentation, congestion • 3. Network Packets • Routing • 2. Data Link Frames • Checksums, flow control • 1. Physical Bits • Mechanics, electrics 3

ISO/OSI Reference model • 7. Application SMTP, FTP, HTTP, … • Data transmission, e-mail, terminal, remote login • 6. Presentation SSL, TLS, … Data • System-dependent RPC, SQL, presentation of the data (EBCDIC / ASCII) … • 5. Session TCP, UPD, • start, end, restart … Segments • 4. Transport • Segmentation, congestion IP, ICMP, … • 3. Network Packets • Routing MAC, LLC, • 2. Data Link 802.11, … Frames • Checksums, flow control In part • 1. Physical 802.3, DSL, Bits • Mechanics, electrics … 4

It is a model, not a running system or exact science! Some protocols might be assignable to more than one layer! ISO/OSI Reference model • 7. Application SMTP, FTP, HTTP, … • Data transmission, e-mail, terminal, remote login • 6. Presentation SSL, TLS, … Data • System-dependent RPC, SQL, presentation of the data (EBCDIC / ASCII) … • 5. Session TCP, UPD, • start, end, restart … Segments • 4. Transport • Segmentation, congestion IP, ICMP, … • 3. Network Packets • Routing MAC, LLC, • 2. Data Link 802.11, … Frames • Checksums, flow control In part • 1. Physical 802.3, DSL, Bits • Mechanics, electrics … 5

How does this look for sending emails? 6

Reference Models: OSI versus TCP/IP 7

Data/Packet Encapsulation 8