מודל osi או : איך המידע עובר באינטרנט ?. OSI Model.

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    24-Dec-2015

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  • Slide 1
  • osi : ?
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  • OSI Model
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  • '
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  • Application Layer 7: The Application Layer The application layer is the OSI layer that is closest to the user It provides network services to the user's applications. It differs from the other layers in that it does not provide services to any other OSI layer, but rather, only to applications outside the OSI model.
  • Slide 15
  • Presentation Layer 6: The Presentation Layer The presentation layer ensures that the information that the application layer of one system sends out is readable by the application layer of another system. Responsible for compression and encryption 2? $ * ^ ## ^% ()? Encryption\ Data Format Change
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  • Session Layer 5: The Session Layer the session layer establishes, manages, and terminates sessions between two communicating hosts. session session session ( $ * ^ ## ^% ()?) 2?
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  • Transport Layer 4: The Transport Layer The transport layer segments data from the sending host's system. Reassembles the data into a data stream on the receiving host's system. Provides Reliability ( $ * ^ ## ^% ()?) 1234 Segmentation 2?
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  • 3 Network Layer 3: The Network Layer provides connectivity and path selection between two host systems that may be located on geographically separated networks. 192.168.13.176192.168.13.191 To IPFrom IP Send to internet IP uses in WAN traffic
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  • Send to LAN Data Link Layer 2: The Data Link Layer The data link layer provides reliable transmit of data across a physical link. The data link layer is concerned with physical (as opposed to logical). 11-2D-34-56-F1-B2-33C2-B1-44-11-23-A5-67 To Mac From Mac Frame (packet) 192.168.13.176192.168.13.191 To IPFrom IP 1
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  • Send to Media 01001001 Physical Layer 1: The Physical Layer The physical layer defines the electrical, mechanical, procedural, and functional specifications for activating, maintaining, and deactivating the physical link between end systems. 010011010100100 F1-B2-33 C2-B1-44 To Mac From Mac 192.168.13.176192.168.13.191 To IPFrom IP 1
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  • Send to NIC 01001001 Physical 010011010100100 1 192.168.13.176 To IP F1-B2-33C2-B1-44 To Mac From Mac F1-B2-33 192.168.13.176 192.168.13.191 From IP
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  • Data Link 1 192.168.13.176192.168.13.191 To IPFrom IP F1-B2-33 C2-B1-44 To Mac From Mac F1-B2-33 192.168.13.176
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  • 1 Network 192.168.13.176192.168.13.191 To IPFrom IP
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  • Transport ( $ * ^ ## ^% ()?) Organizing segment 2? 1 2 3 4 2?
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  • Session session session session ( $ * ^ ## ^% ()?) 2?
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  • Presentation decryption\ Data Format Change $ * ^ ## ^% ()? 2?
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  • Application
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  • ' Layers 7-4 Layer 2 Layer 3 Layer 1 Layer 2 Layer 1