01. Before OSI
Network Security - Common Security Attacks/Mitigation's - Hacking - Malicious Codes (Virus, Worms) - Threat Defense
01. Before OSI
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02. OSI Layers
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03. Application Layers
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04.  Presentation Layer
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05.  Session layer
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06.  Transport Layer
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07.  Network Layer part 1
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08.  Network Layer part 2
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09.  Protocol & port no
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10.  Data Link Layer
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11.  Physical Layer
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12.  Devices on OSI Layers
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13.  What is PDU
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14.  Data encapsulation & De-encapsulation process
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15.  OSI Peer to Peer model
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16. OSI & TCP-IP
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5. Introduction of GRE
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22. Object Group & Its Type
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