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This web page ccnaguider.blogspot.com states the following, "The OSI and TCPIP Networking Models." We saw that the webpage said " Friday, June 27, 2008." It also said " The OSI and TCPIP Networking Models. OSI Open Systems Interconnection is a standard description or reference model for how messages should be transmitted between any two points in a telecommunication network. It is the Open System Interconnection reference model for communications. Its purpose is to guide product implementors so that their products will consistently work with other products. Functional Description of Layers -." The header had Cisco as the highest ranking optimized keyword. It is followed by ccna, ccna guide, and cisco press which isn't as ranked as highly as Cisco. The next words ccnaguider.blogspot.com used was ccna notes. osi was included but will not be viewed by search engines.