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ISO developed the seven-layer model to help vendors and network administrators gain a better understanding of how data is handled and transported between *Layer 1: Network Interface - This layer combines the Physical and Data layers and routes the data betw ...

*Administration - this is not a course for system administrators or though who maintain Unix systems full time although it could be first st ...attempt to unify the two branches of unix called Portable Operating System Interface [for Unix] or POSIX. ...