title: the meaning of the output from iwlist scan
body: <p>i have a question to the output of iwlist scan. for instance i have the following result.
  There are multiple entries with IE. What does the IE stand for? Becasue there are multiple entries i guess there are different encryption options for this Wifi. What are all options can be displayed there? "WPA Version 1","IEEE 802.11i/WPA2 Version 1","unkonw" what is about WEP? Or EAP? How this will be displayed?</p>
  
  <pre><code>      Cell 01 - Address: 00:1F:F3:02:04:81
                  ESSID:"Apple Network"
                  Mode:Master
                  Channel:1
                  Frequency:2.412 GHz (Channel 1)
                  Quality=42/100  Signal level:-84 dBm  Noise level=-127 dBm
                  Encryption key:on
                  IE: WPA Version 1
                      Group Cipher : TKIP
                      Pairwise Ciphers (1) : TKIP
                      Authentication Suites (1) : PSK
                  IE: IEEE 802.11i/WPA2 Version 1
                      Group Cipher : TKIP
                      Pairwise Ciphers (2) : CCMP TKIP
                      Authentication Suites (1) : PSK
                  IE: Unknown: 2D1A2C0217FFFF000000000000000000000000000000000000000000
  </code></pre>