Distribution System (DS)
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Distribution System (DS)

• A distribution system (DS) is used to interconnect a set of basic service sets (BSSs) via integrated LANs to create an extended service set (ESS).
• Access points by their very nature are portal devices. Wireless traffic can be destined back onto the wireless medium or forwarded to the integration service.
  

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Reference:
Coleman, David D.,Westcott, David A. CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106 Wiley.