27 21 00 Data Communications Network Equipment

27 21 26 Data Communications Network Management

27 21 13 Data Communications Firewalls 27 21 16 Data Communications Routers, CSU/DSU, Multiplexers, Codecs, and Modems 27 21 26 Data Communications Network Management 27 21 29 Data Communications Switches and Hubs 27 21 33 Data Communications Wireless Access Points

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