OSI Model
Computers · OSI मॉडल · 12 facts
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OSI Model has 7 layers for network communication
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Layer 1: Physical — cables, signals, hardware
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Layer 2: Data Link — MAC address, switches
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Layer 3: Network — IP address, routing
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Layer 4: Transport — TCP/UDP, port numbers
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Layer 5: Session — manages communication sessions
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Layer 6: Presentation — encryption, data formatting
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Layer 7: Application — HTTP, FTP, SMTP, DNS
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TCP/IP model has 4 layers (simplified version of OSI)
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Router operates at Network Layer (Layer 3)
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Switch operates at Data Link Layer (Layer 2)
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Hub operates at Physical Layer (Layer 1)