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TCP/IP Model:

• Built around the TCP/IP protocol suite – A protocol suite is a large number of related protocols that work together to allow networked computers to communicate

• Layers with same names as OSI Model don’t function exactly the same

tcp/ip

Application Layer of TCP/IP Model:

Application Layer of TCP/IP Model

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Transport Layer of TCP/IP Model:

• Functions the same as the Transport layer in OSI Model and part of Session layer – TCP and other similar protocols take on some of the function of the Session layer 

•Synchronize source and destination computers to set up the session between the respective computers

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Internet Layer of TCP/IP Model

 • Performs: – Same functions as OSI Model Network Layer – Many of the functions of the Logical Link Control sublayer of the OSI Model’s Data Link layer • Primary protocol is Internet Protocol (IP) • Also uses Address Resolution Protocol (ARP), which performs much of the LLC sublayer’s job in the area of physical addressing

Interface Layer of TCP/IP Model 

• Performs much of the job of the MAC portion of the Data Link and Physical layers of the OSI Model 

• TCP/IP Protocol does not dictate what happens on Network Interface layer 

• TCP/IP protocol suite relies on standards created by the various standards organizations concerning how to encode bits onto media to do the work on this layer

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Alternate Layer Names for the TCP/IP Model 

• CompTIA Network+ objectives recognize alternate layer name for last layer in TCP/IP Model – the Link layer

Alternate Layer Names for the TCP/IP Model 

How the Layers Work Together:

• Different protocols located on the Application layer of the TCP/IP Model connect to different Transport layer protocols – Exception: DNS protocol on the Application layer connects to both TCP (Transport Control Protocol) and UDP (User Datagram Protocol) protocols on the Transport layer.

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TCP/IP Model and its Relation to Protocols of the TCP/IP Suite

TCP/IP Model and its Relation to Protocols of the TCP/IP Suite