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Instructions provide a tutorial (data provided) with the steps for cleaning up data and adding new fields used by Network Analyst.
Note: This article is intended for ArcGIS Desktop 10.1 and later, and this solution does not work with earlier versions.
Download and unzip the data, NA_Data_Prep_Tutorial.zip, from the Related Information section below. After the download is complete, follow the instructions located in ArcGIS Network Analyst data prep tutorial.docx.