OSI Model Kya Hai ? !! How Many Type Of Layer In OSI ?

OSI (Open Systems Interconnection) Model ek conceptual framework hai jo network protocols aur communication processes ko seven layers me divide karta hai. Har layer specific tasks perform karti hai aur upper aur lower layers ke sath interact karti hai. Ye model network systems ko design, implement, aur troubleshoot karne me help karta hai, aur ise International Organization for Standardization (ISO) ne 1984 me introduce kiya tha. OSI Model ka main goal tha different network systems ke beech interoperability ko facilitate karna aur networking protocols ko standardize karna.

OSI Model ke seven layers is prakar hain:

  1. Physical Layer (Layer 1): Ye sabse neeche wali layer hai jo hardware transmission technologies se deal karti hai. Iska kaam hai data ko raw bit stream ke roop me physical medium (jaise ki copper wire, fiber optic cable, ya wireless signal) ke through transmit karna.
  2. Data Link Layer (Layer 2): Ye layer physical layer ke upar hoti hai aur network entities ke beech frame transmission ko reliable banane ke liye responsible hoti hai. Isme error detection aur correction bhi shamil hai.
  3. Network Layer (Layer 3): Ye layer routing aur forwarding ke liye responsible hoti hai. Iska main kaam hai packets ko source se destination tak pahunchana, chahe vo different networks me hi kyu na ho.
  4. Transport Layer (Layer 4): Is layer ka kaam hai end-to-end communication services provide karna, jaise ki data transfer, error recovery, aur flow control.
  5. Session Layer (Layer 5): Ye layer sessions ko establish, manage, aur terminate karta hai between applications. Iska main kaam hai communication sessions ko control karna.
  6. Presentation Layer (Layer 6): Is layer ka kaam hai data formats ko translate karna, encryption/decryption, aur compression/decompression provide karna. Ye ensure karta hai ki data correct format me transfer ho.
  7. Application Layer (Layer 7): Ye sabse upar wali layer hai jo end-user processes aur network services ko enable karta hai, jaise ki email, file transfer, aur web browsing.

OSI Model ka main purpose hai network communication ko modularize karna, jisse different types ke systems aasani se communicate kar sake. Is model ka use karke, developers aur engineers network components ko aasani se understand, design, aur troubleshoot kar sakte hain.

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