Successfully reported this slideshow.
Wireless Fundamentals Examining Wireless Media Access
Sending a Frame
Sending a Frame (Cont.)
Sending a Frame (Cont.)
After a Frame Is Sent
802.11 Frame Shape
Frame Types <ul><ul><li>Management:   </li></ul></ul><ul><ul><ul><li>Beacon, probe request, probe response </li></ul></ul>...
Frame Types (Cont.) <ul><ul><li>Control:  </li></ul></ul><ul><ul><ul><li>Request to send (RTS), clear to send (CTS), ackno...
802.11 Frame Speeds
Discovering the Network (Mgmt Frames)
Connecting (Mgmt Frames)
Staying Connected (Mgmt Frames)
Control Frames <ul><li>ACK is used after each frame. </li></ul>RTS and CTS are used in 802.11b and g mixed cells and in hi...
WMM Enhancement
Power Save Mode
Summary <ul><ul><li>Sending a frame requires a timing and acknowledgment system that is based on CSMA/CA. </li></ul></ul><...
 
Upcoming SlideShare
Loading in …5
×

Iuwne10 S01 L07

373 views

Published on

Published in: Technology, Education
  • Be the first to comment

  • Be the first to like this

Iuwne10 S01 L07

  1. 1. Wireless Fundamentals Examining Wireless Media Access
  2. 2. Sending a Frame
  3. 3. Sending a Frame (Cont.)
  4. 4. Sending a Frame (Cont.)
  5. 5. After a Frame Is Sent
  6. 6. 802.11 Frame Shape
  7. 7. Frame Types <ul><ul><li>Management: </li></ul></ul><ul><ul><ul><li>Beacon, probe request, probe response </li></ul></ul></ul><ul><ul><ul><li>Authentication request, authentication response </li></ul></ul></ul><ul><ul><ul><li>Association request, association response </li></ul></ul></ul><ul><ul><ul><li>Deauthentication, reassociation request, reassociation response </li></ul></ul></ul><ul><ul><ul><li>Announcement Traffic Indication Message (ATIM) </li></ul></ul></ul>
  8. 8. Frame Types (Cont.) <ul><ul><li>Control: </li></ul></ul><ul><ul><ul><li>Request to send (RTS), clear to send (CTS), acknowledgment (ACK), </li></ul></ul></ul><ul><ul><ul><li>Power Save Poll (PS-Poll), </li></ul></ul></ul><ul><ul><li>Data: </li></ul></ul><ul><ul><ul><li>Simple data </li></ul></ul></ul><ul><ul><ul><li>Null function (empty frame) </li></ul></ul></ul>
  9. 9. 802.11 Frame Speeds
  10. 10. Discovering the Network (Mgmt Frames)
  11. 11. Connecting (Mgmt Frames)
  12. 12. Staying Connected (Mgmt Frames)
  13. 13. Control Frames <ul><li>ACK is used after each frame. </li></ul>RTS and CTS are used in 802.11b and g mixed cells and in hidden node situations.
  14. 14. WMM Enhancement
  15. 15. Power Save Mode
  16. 16. Summary <ul><ul><li>Sending a frame requires a timing and acknowledgment system that is based on CSMA/CA. </li></ul></ul><ul><ul><li>802.11 frames have a specific shape with headers containing specific information and different parts that are sent at different speeds. </li></ul></ul><ul><ul><li>Beacons and probes help discover the network. </li></ul></ul><ul><ul><li>Authentication and association frames are used to join the cell. </li></ul></ul><ul><ul><li>Some other management frames may be used while the client is connected. </li></ul></ul><ul><ul><li>Control frames improve the communication framework by allowing special messages in specific cases, such as RTS and CTS or PCF. </li></ul></ul><ul><ul><li>Some stations may use the power save mode to increase battery time, which means there must be specific exchanges with the AP. </li></ul></ul>

×