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+OSI model:
+7. Application layer smtp, http, ssh
+6. Presentation layer encryption, compression, data formating
+5. Session layer Sockets(tcp,ip,port)? Start, stop session (data transfer), still no tcp (net socket init)?
+4. Transport layer tcp/udp
+3. Network layer ip, routing
+2. Data link layer mac, switch
+1. Physical layer cable, nic, hub
+
+Network Interface Card and cables 1PHYSICAL
+Frame header | | frame footer 2DATA LINK frame
+ | ip header | ip date | 3INTERNET packet
+ | tcp header | tcp data | 4TRANSPORT segment
+ | app data | 5APP
+
+APP -> OSI app, presentation, session
+
+
+
+Internet protocol suite (TCP/IP model):
+
+Frame header | | frame footer 1LINK
+ | ip header | ip date | 2INTERNET
+ | tcp header | tcp data | 3TRANSPORT
+ | app data | 4APP