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CompTIA Security+ Exam Prep

Category - Communication

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Why is SSID filtering not considered a secure form of access control?
  1. SSID is uni-casted in the clear to every access point beacon by default.
  2. The SSID of a wireless LAN client must match the SSID on the access point in order for the client to authenticate and associate to the access point.
  3. SSID of a network can be easily found out using a protocol analyzer.
  4. SSID encryption is easy to decrypt using freeware utilities.
Explanation
Answer: C - SSID filtering is not considered a secure form of access control because a network SSID can be easily found out using a protocol analyzer.

SSID is sent as part of each beacon frame and probe response frame. A protocol analyzer is computer software or hardware that can intercept and log traffic passing over a digital network or part of a network. As data streams flow across the network, the sniffer captures each packet, and if needed, decodes and analyzes its content according to the appropriate RFC or other specifications.
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