17/12/2025
🌐 OSI MODEL & TCP/IP – Fahamkooda si Sahlan oo Qoto Dheer
Dad badan waxay maqlaan OSI Model iyo TCP/IP, balse si dhab ah uma fahmaan waxa ay yihiin iyo sababta ay muhiim u yihiin. Qoraalkan waxaan si kooban oo cad kuugu sharxayaa labadaas tiir ee shabakadaha Internet-ka 💡
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📘 OSI MODEL (Open Systems Interconnection)
OSI Model waa qaab waxbarasho (theoretical model) oo sharaxaya sida xogtu uga safarto computer-kaaga ilaa computer kale.
👉 Waxay ka kooban tahay 7 layers (heerar)
Heer kasta wuxuu leeyahay shaqo gaar ah.
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1️⃣ Physical Layer
📌 Xogta sidee u safartaa jir ahaan?
Cable (LAN)
Fiber optic
WiFi signals
Voltages & bits (0 & 1)
🧠 Tusaale: Sida korontadu u marto xadhigga.
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2️⃣ Data Link Layer
📌 Sidee qalabyadu isu aqoonsadaan?
MAC Address
Switch
Frame
🧠 Tusaale: Switch ayaa hubiya kombiyuutarka saxda ah ee xogta la gaarsiinayo.
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3️⃣ Network Layer
📌 Xogtu waddo noocee ah ayay martaa?
IP Address
Router
Routing
🧠 Tusaale: Google Maps oo kuu dooranaya jidka ugu gaaban.
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4️⃣ Transport Layer
📌 Xogta ma dhammaatay mise way luntay?
TCP (Ammaan & hubin)
UDP (Degdeg & fudud)
Ports (80, 443, 22)
🧠 Tusaale: Hubin in fariintaadu gaartay qofka oo dhammeystiran.
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5️⃣ Session Layer
📌 Xiriirka ma furan yahay?
Session management
Authentication
🧠 Tusaale: Marka aad login gasho website.
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6️⃣ Presentation Layer
📌 Xogta sidee loo soo bandhigayaa?
Encryption / Decryption
Compression
Formatting
🧠 Tusaale: HTTPS oo xogta qarinaya.
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7️⃣ Application Layer
📌 User-ka maxuu isticmaalayaa?
HTTP / HTTPS
FTP
SMTP
DNS
🧠 Tusaale: Browser, Email, WhatsApp.
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🧠 Xusuus fudud:
> All People Seem To Need Data Processing
(Application → Physical)
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📗 TCP/IP MODEL
TCP/IP waa model-ka dhabta ah ee Internet-ku ku shaqeeyo 🌍
Wuxuu leeyahay 4 layers oo keliya.
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1️⃣ Application Layer
HTTP
FTP
SMTP
DNS
🧠 La mid ah OSI layer 7,6,5
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2️⃣ Transport Layer
TCP
UDP
Ports
🧠 La mid ah OSI layer 4
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3️⃣ Internet Layer
IP
ICMP
Routing
🧠 La mid ah OSI layer 3
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4️⃣ Network Access Layer
Ethernet
WiFi
MAC
🧠 La mid ah OSI layer 1 & 2
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🔥 Farqiga u Dhexeeya OSI & TCP/IP
OSI MODEL TCP/IP
7 Layers 4 Layers
Waxbarasho Dhab ahaan loo isticmaalo
Theory Practical
ISO sameeyay DARPA sameeyay
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🧠 Maxay muhiim u yihiin?
✔ Fahamka Internet-ka
✔ Cybersecurity & Hacking
✔ Networking (CCNA, Network+)
✔ Troubleshooting
✔ IT Jobs
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🔐 Qof walba oo raba:
Ethical Hacking
Networking
SOC Analyst
IT Support
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📌 Haddii aad rabto casharro sawirro leh, practical labs, ama PDF buug ah – ii sheeg!
👍 Like, Share & Comment haddii aad wax ka faa’iiday 🖤
