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| Question | Answer |
| OSI Layer 7 | Application Layer (DATA) HTTP, HTTPS, SSH, FTP, SFTP |
| OSI Layer 6 | Presentation Layer (DATA) ASCII,Encryption, Decryption |
| OSI Layer 5 | Session Layer (DATA) Starts, maintains and ends Sessions |
| OSI Layer 4 | Transport Layer (Segments) TCP, UDP, ACK,NACK,WINDOWING,SEQUENING |
| OSI Layer 3 | Network Layer (Packets) IP, IPX, RIP, OSPF, EIGRP, Routers |
| OSI Layer 2 | Data-Link Layer (FRAMES) MAC, Frame-Relay, PPP, Wireless, Switches, Bridges |
| OSI Layer 2 Sub-Layers | Logic-Link Layer Media Acces Controll Layer |
| OSI Layer 1 | Physical Layer (Bits) Cabling, Voltage, HUB, Repeaters |
| Encapsulation Order | The lower Layer encapsulates the upper. Data=>Segments=>Packets=>Frames=> Bits |
| PDU | Protocol Data Units (Data, Segments, Packets, Frames, Bits) Information that is delivered as a unit among peer entities of a network. |
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