OSI Model vs. TCPIP by InfosecTrain .pdf
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Ever wonder how your data travels across the internet? ๐ค Letโs break it down: ๐ง ๐๐๐ ๐๐จ๐๐๐ฅ โ 7 layers of theory, great for learning & troubleshooting โ๏ธ ๐๐๐/๐๐ ๐๐จ๐๐๐ฅ โ 4 layers built for real-world internet communication ๐ OSI = Clear structure ๐ TCP/IP = Practical performance ๐ก Learn the difference. Use both wisely. Build better networks.
OSI Model vs. TCPIP by InfosecTrain .pdf
- 1. OSI Model vs. TCP/IP Understanding the architecture that powers your network
- 2. OSI Model (7 Layers) TCP/IP Model (4 Layers) Layer 7: Application Layer 6: Presentation Layer 5: Session Layer 4: Transport Layer 3: Network Layer 2: Data Link Layer 1: Physical TCP/IP combines layers for efficiency, while OSI keeps each function distinct OSI Model: A theoretical blueprint that clearly separates network responsibilities to ease learning and troubleshooting. TCP/IP Model: A real-world implementation model built to support scalable, robust communication over the Internet. OSI vs. TCP/IP Application Transport Internet Network Interface
- 3. OSI Layer vs. TCP/IP Model: Layer-wise Functionality OSI Layer OSI Model Main Role Layer 7: Application Layer 6: Presentation Layer 5: Session Layer 4: Transport Layer 3: Network Layer 2: Data Link Layer 1: Physical User interaction (e.g., HTTP, FTP) Data format, encryption (e.g., SSL) Session control (e.g., API calls) Reliable delivery (e.g., TCP, UDP) Routing and addressing (e.g., IP) Frame transfer (e.g., Ethernet, PPP) Signal transmission (e.g., cables)
- 4. Layer Functionality Examples 1. Network Interface (Link Layer) 2. Internet Layer 3. Transport Layer 4. Application Layer TCP/IP Model Handles hardware addressing, access to physical media, and frame transmission over LAN/WAN. Responsible for logical addressing, routing, and packet forwarding between networks. Ensures reliable or best-effort delivery of data between hosts; manages segmentation and reassembly. Supports user applications, data formatting, and session controlโall in one layer. Ethernet, Wi-Fi, ARP, MAC, PPP IP, ICMP, IGMP TCP (reliable), UDP (fast, connectionless) HTTP, FTP, SMTP, DNS, Telnet, SSH TCP/IP absorbs 5, 6, 7 into one โApplicationโ and 1 and 2 into โNetwork Interface.
- 5. Key Differences Aspect OSI Model TCP/IP Model Origin Layer Count Flexibility Adoption Approach ISO โ International Organization for Standardization (theoretical model) ISO โ International Organization for Standardization (theoretical model) 7 4 Strict layer separation Layer interdependence allowed Rare in implementation Used in all modern networks Top-down Bottom-up Protocol Examples by Layer OSI is best for: โข Learning โข Troubleshooting โข Explaining abstract network concepts TCP/IP is best for: โข Implementing internet protocols โข Real-world communication stacks โข Designing scalable networks When to Use What TCP/IP Layer Common Protocols Application Transport Internet Network Interface HTTP, SMTP, FTP, DNS TCP, UDP IP, ICMP, ARP Ethernet, Wi-Fi, MAC, PPP