Before I show you how to setup and configure your Cisco Router and Switch I thought that I would go over the OSI Model with you. The OSI Model is probably the topic that shows up most frequently on the ICND1 Exam.

The OSI Model was created because when the internet was in its infancy there were many companies producing different types of networking technologies. Networks during this time were increasing very rapidly and many problems began to arise when networks from different vendors could not talk to one another.

By following the OSI Model networks created by different vendors can now communicate with one another.

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There are two protocalls that operate in the transport layer: TCP and UDP. TCP Is reliable and connection oriented Breaks data into segments Numbers the segments through sequencing Assembles the segments at the destination Resends segments if lost UDP Is connectionless and does not verify UDP just sends the data and hopes it gets there. [...]

The OSI Model was created in 1984 because in the early 1980′s there were many companies producing different types of networking technologies. Networks during this time were increasing very rapidly and many problems began to arise when networks from different vendors could not talk to one another. By following the OSI Model networks created by [...]