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Flashcards

802.11 Layer 2

jeriel.juarbe2031 Wireless college English 34 cards

Cards in this deck (34)

  1. 1What is the Max Payload for 802.11?2304 Bytes
  2. 2What are the 3 types of Encryption?1) WEP
    2) WPA
    3) WPA2
  3. 3802.11 standard specifies that all stations(AP's and Clients) will use this network access method to avoid Layer 2 collisionsCarrier Sense Multiple Access with collision
    CSMA/CA
  4. 4What are the 3 key things I need to know about CSMA/CA ?1) it is the 802.11 network access method
    2) CA= a) Physical = Listening
    3) CA b) Virtual = Duration ID (IE:500ms)
    NAV Timer
  5. 5T or F: CSMA/CA uses ACK frames to detect collisions. 802.11 devices expect an ACK for each unicast frame transmitted.True
  6. 6802.11 MAC Address Normal Traffic?3 MACs:
    SMAC, TMAC, and BSSID
  7. 7What are the 3 steps for connecting to a WLAN?Discovery
    Authentication
    Association
    Optional 4th step: WPA/WPA2
  8. 8What is expected after every unicast frame?ACK Frame
  9. 9In the Discover State, what are the 2 ways to to discover networks?Passive scanning
    Active scanning
  10. 10Discover state, Passive Scanning =?client Listening for Beacons (SSID's)
  11. 11Discover state, Active Scanning =?client Transmits a Probe Request
    (*SSID)
  12. 12In the Discover state, when active scanning (probe Request) is occurring , per the 802.11 standard what will the AP's SSID or Null SSID do?it will reply with a PROBE Response
    (*SSID)
  13. 13What are the 2 types of Authentication in state 2?1) Open State
    2) Shared Key
  14. 14What the 4 key points/info to know for Open System?1) it is the Default
    2) No encryption (WEP/WPA/WPA2)
    3) 2 step Process (with can include MAC Filtering on the SMAC)
    4) More Secure
  15. 15What are the 2 Key points/features of Shared Key?1)Requires WEP
    2) 4 Step Process
  16. 16In state 3 Association, who sends the association Request?Client
    (*SSID)
  17. 17When an AP receives an Association Request it checks if the requester successfully authenticated and if any restriction applies. if good to go then a Association Response is sent. if associated then clients MAC is added to the AP's association Table. T or F?True
  18. 18T or F: clients will receive IP addresses once they associate (if the network does not implement 802.1xEAP).True
  19. 19T or F: An 802.11 station can associate to how many AP's at a time?1 and only 1
  20. 20802.11 Frame Structure: Every Frame has a type. What are the 3 types of Frame Type/Subtype?0 = Management
    1= Control
    3= Data
  21. 21in the To/From DS flags which describe whether or not the frame is going to or from a DS, what flags will be present if it is a AD HOC network?00
  22. 22This bit is set if the frame is being transmitted because station did not receive an ACK frame for previous transmission. (unicast)Retry
  23. 232 packets with the same seq#'s is because?the packet is getting re-transmitted cause the ACK was not received
  24. 24Management Frames are in plain text. True or FalseTrue
  25. 25these are types of management frames: -Discover, Authentication, association -Beacon Frame -Probe Request, Probe Response Frames -Authentication frame -Association Request/Response Frames --Reassociation Frames
    -Deauthentication Frame
    -Disassociation Frame
  26. 26T or F: A station may Authenticate with more than one AP at a time?True
  27. 27T or F: A station may associate with only 1 AP at a time?True
  28. 28these Frames.....used by stations to move their association from one AP to another with in an ESS (contains SSID)Reassociation Request/Response Frames
  29. 29T or F: Both Deauthentiation and Disassociation Frames are one-way comms; no reply from the receiving end is required.True
    GET OFF (64 times)
  30. 30What Type of Frame is described below? Plain text ACK, RTS/CTSControl Frames
  31. 31This subtype of Control Frame minimize excessive collisions caused by a client who is unaware other clients are transmitting on the same network.Request to Send/Clear to Send Frames
    RTS/CTS Frames
  32. 32T or F: The extra overhead of RTS/CTS reduces Maximum throughput on the networkTrue
  33. 33This Type of Frame can be encrypted and is L3 (PAYLOAD) and Above...DATA Frames
  34. 34Only what type of clients can send a null function frame (Subtype of Data Frames)?Only Wireless Clients
    I'm going to sleep. ... I'm waking up... etc

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college Wireless (802.11 Layer 2) Flashcards on 802.11 Layer 2, created by jeriel.juarbe2031 on 04/10/2014.
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