OSI Model-Network (updated version) .pdf
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The OSI model is a framework that outlines how devices connect and facilitates compatibility among network protocols, offering guidelines for data encapsulation and transmission. It consists of seven layers, each serving specific functions, while the more practical TCP/IP model is used for implementation in current networks like the internet. Key differences between the two models include that the OSI model is theoretical and aimed at standardizing communication processes, whereas TCP/IP is based on practical protocols for actual network usage.
OSI Model-Network (updated version) .pdf
- 1. Networking Fundamentals « Open system interaction model » ❑ The OSI model is a general framework that define how we connect our devices and enables network protocols, software, and systems to be designed around a general set of guidelines. ❑ Common guidelines allow higher probability of system compatibility and logical traffic flow. In other words, if we all play by the same rules, everyone will get along with as few errors as possible. ❑ OSI Model
- 2. OSI LAYERS OSI Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer
- 3. OSI LAYERS OSI Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer • Data wanted to be sent in the network(https header , files...) • Lunshed by an applications like(browsers , games..)
- 4. OSI LAYERS OSI Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer • Data compression/ decompression • Data encryption/decryption • Defining data format (JPG,HTML,TXT...)
- 5. OSI LAYERS OSI Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer • Creating , terminating logical sessions . • Defining communication modes(single, half-duplex, full-duplex)
- 6. OSI LAYERS OSI Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer • How to Transport the data? • Reliably • Fast & unreliably • L4 header
- 7. OSI LAYERS OSI Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer • Routing protocols • choosing the best path for routing depending in used protocol
- 8. OSI LAYERS OSI Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer • Data Encoding from Ascii to binary , Decoding binary to Ascii
- 9. OSI LAYERS OSI Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer • Physical connection (Ethernet connections 802.3, wireless connections 802.11)
- 10. OSI & TCP/IP Models
- 11. OSI & TCP/IP Models • The TCP/IP model, which is more pragmatic and widely used in current networks, particularly the Internet, consists of four layers: Network Access, Internet, Transport, and Application. Key differences between OSI model and TCP/IP model : • Although both models aim to facilitate network communication, the TCP/IP model is based on practical and implemented protocols, such as TCP and IP, whereas the OSI model remains a theoretical reference framework. • The main difference lies in their application: the OSI model is primarily used for understanding and standardizing network communication processes, while the TCP/IP model is used for the actual implementation of networks, especially in practical contexts like the Internet.
- 12. OSI VS TCP/IP TCP/IP Application Layer Host-To-Host Transport Internet Layer Network interface Layer OSI Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer
- 14. Encapsulation & Decapsulation • Encapsulation: is the process of adding additional information when data is traveling in an OSI or TCP/IP model • Decapsulation: reverses the process by removing the info one by one, so a destination device can read the original data.
- 15. Encapsulation https://www.youtube.com DATA (https header) DATA (https header) L4 header L3 header DATA (https header) L4 header DATA (https header) L4 header L3 header L2 header L2 trailer HASH PAYLOAD
- 16. Encapsulation https://www.youtube.com DATA (https header) DATA (https header) L4 header L3 header DATA (https header) L4 header DATA (https header) L4 header L3 header L2 header L2 trailer HASH PAYLOAD SEQUENCE PACKET FRAME
- 17. Decapsulation https://www.youtube.com DATA (https header) DATA (https header) L4 header L3 header DATA (https header) L4 header DATA (https header) L4 header L3 header L2 header L2 trailer HASH PAYLOAD
- 18. COMMON ATTACKS IN THE OSI MODEL
- 19. COMMON ATTACKS IN THE OSI MODEL