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

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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

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Data Segments Packets Frames Bits

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

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Data Segments Packets Frames Bits SMTP, FTP, HTTP, … SSL, TLS, … RPC, SQL, … TCP, UPD, … IP, ICMP, … MAC, LLC, 802.11, … In part 802.3, DSL, …

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

5

Data Segments Packets Frames Bits SMTP, FTP, HTTP, … SSL, TLS, … RPC, SQL, … TCP, UPD, … IP, ICMP, … MAC, LLC, 802.11, … In part 802.3, DSL, … It is a model, not a running system or exact science! Some protocols might be assignable to more than one layer!

How does this look for sending emails?

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Reference Models: OSI versus TCP/IP

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Data/Packet Encapsulation

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