Chapter 2 OSI Model and TCP/IP
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1 Chapter OSI Model and TCP/IP The OSI Model Layers in the OSI Model TCP/IP Protocol Suite Addressing TCP/IP Versions - Figure - The OSI model -
2 Figure - OSI s Device A Intermediate node Intermediate node Device B - interface - interface - interface - interface - interface - interface rd nd st Peer-to-peer protocol (th ) Peer-to-peer protocol (th ) Peer-to-peer protocol (th ) Peer-to-peer protocol (th ) rd nd st rd nd st - interface - interface - interface - interface - interface - interface communication - Figure - An exchange using the OSI model H H H H H H H H Transmission medium -
3 Figure - From data link To data link L data L data Transmission medium - Figure - From network To network Data link H Frame Frame H Data link L data To physical L data From physical -
4 Figure - From transport To transport H Packet Packet H To data link From data link - Figure - From session To session To network From network -8
5 Figure -8 From presentation To presentation H H To transport From transport -9 Figure -9 From application To application Encoded, encrypted, and compressed data H Decoded, decrypted, and decompressed data H To session From session -0
6 Figure -0 User User X.00 FTAM X.00 X.00 FTAM X.00 To presentation From presentation - Figure - TCP/IP and OSI model s SMTP FTP TELNET DNS SNMP NFS RPC TFTP TCP UDP ICMP IGMP IP ARP RARP Protocols defined by the underlying networks -
7 Figure - Addresses in TCP/IP Addresses IP Port - Figure - Relationship of s and es Processes TCP UDP Port IP and other protocols IP Underlying physical networks -
8 Figure - es Data 0 8 Trailer Source Destination - Figure - A E IP es 0 8 Bus Data A P 0 0 G 99 F 0 R T H Ring Data A P 9 N R Z Data A P 99 P M 9 Bus -
9 Figure - Port es A B Data j k Data j k j Data- k A P j Data- k A P Data- j k A P j Data- k A P Data- j k A P H Data- j k A P H Data- j k A P H j Data- k A P H Internet -
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