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17 Cards in this Set
- Front
- Back
Used by 802.11 networks this listens to see whether any other device is transmitting. Used to limit packet collisions. |
CSMA/CA (Carrier sense multiple access/collision avoindance) |
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The ______ frame is a method of delivery verification of unicast frames. |
ACK (acknowledgment) |
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What two frames do not require an acknowledgment? |
broadcast and multicast |
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When a unicast frame is corrupted, what will fail and cause the receiving radio to not send an ACK frame to the transmitting radio? |
cyclic redundancy check (CRC) |
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What is the mandatory access method of the 802.11 standard? |
Distributed coordination function (DCF) |
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What is the optional access method used by the 802.11 standard? |
Point coordination function (PCF) |
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The four main components of distributed coordinated function (DCF) are: |
Interframe space Duration/ID field Carrier Sense Random backoff timer |
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The period of time that exist between transmissions of wireless frames is called what? |
Interframe space (IFS) |
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The six type of interframe space are: |
Reduced interframe space (RIFS) Short interframe space (SIFS) PCF interframe space (PIFS) DCF interframe space (DIFS) Arbitration interframe space (AIFS) Extended interframe space (EIFS) |
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The two most common interframe spaces used are: |
SIFS and DIFS |
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What field in a MAC header displays a value of time, in microseconds, that is required to transmit an active frame exchange process so that other radios do not interrupt the process. |
Duration/ID field |
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This maintains a prediction of future traffic on the medium based on Duration value information. |
Network allocation vector (NAV) |
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Point coordination function cannot be utilized in an ________ network because no AP exists in an independent basic service set (IBSS) |
ad-hoc |
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The 802.11 standard defines an optional function called ________ ________ ___________ that allows the AP to poll client stations about their need to transmit. |
Point Coordination Function (PCF) |
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The two ways that a carrier sense is performed are: |
virtual carrier sense and physical carrier sense |
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EDCA (enhanced distributed channel access) define how man access categories, based on the eight UPs? |
4 AC_BK (background) AC_BE (best effort) AC_VI (video) AC_VO (voice) |
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Physical carrier sense has two purposes: |
To determine if a frame transmission is inbound for a station to receive. To determine if the medium is b busy before transmitting. |