OSI Model OSI Model Application Layer 7 The

OSI Model

OSI Model

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.

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 מה נשמע תומר איך הייתה בחינת פרק Encryption Data Format Change ? () %^ ת פ # י # כ גורצ ח*ח בה^יב ב $ גכ כג

מר Session n מ עם s e s si o ו טי תו עם se ss io n (? () %^ ת פ # י # כ גורצ ח*ח בה^יב ב $ )גכ כג עם משה session ? 2 מה נשמע תומר איך הייתה בחינת פרק Layer 5: The Session Layer • the session layer establishes, manages, and terminates sessions between two communicating hosts.

? 2 פרק הייתה בחינת תומר איך מה נשמע (? () %^ ת פ # י # כ גורצ ח*ח בה^יב ב $ )גכ כג מר Segmentation 4 3 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 2 1 שי ח ה ע ם תו

Se nd to in te rn et To IP From IP 192. 168. 13. 176 192. 168. 13. 191 3 הייתה בחינת Network Layer 3: The Network Layer • provides connectivity and path selection between two host systems that may be located on geographically separated networks. IP uses in WAN traffic

To Mac C 2 -B 1 -44 -11 -23 -A 5 -67 From IP 1 192. 168. 13. 176 192. 168. 13. 191 מה נשמע Se nd to LA N 11 -2 D-34 -56 -F 1 -B 2 -33 To IP From Mac 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). Data Link Frame (packet)

To Mac To IP From Mac From IP 1 010011010100100 Se nd to M ed ia F 1 -B 2 -33 C 2 -B 1 -44 192. 168. 13. 176 192. 168. 13. 191 מה נשמע 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. Physical 01001001

IC Se nd to N 010011010100100 To Mac From Mac To IP From IP 1 F 1 -B 2 -33 C 2 -B 1 -44 192. 168. 13. 176 192. 168. 13. 191 מה נשמע 192. 168. 13. 176 F 1 -B 2 -33 Physical 01001001

From Mac To IP 1 From IP F 1 -B 2 -33 192. 168. 13. 176 מה נשמע 192. 168. 13. 191 C 2 -B 1 -44 192. 168. 13. 176 F 1 -B 2 -33 Data Link

To IP From IP 1 192. 168. 13. 176 מה נשמע 192. 168. 13. 191 Network

Application

תומר מחזיר תשובה לאושר במסנג'ר Layers 7 -4 Layer 1 Layers 7 -4 Layer 2 אושר Layer 2 Layer 3 Layer 1 תומר