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17 Cards in this Set

  • Front
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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)

The ______ frame is a method of delivery verification of unicast frames.

ACK (acknowledgment)

What two frames do not require an acknowledgment?

broadcast and multicast

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)

What is the mandatory access method of the 802.11 standard?

Distributed coordination function (DCF)

What is the optional access method used by the 802.11 standard?

Point coordination function (PCF)

The four main components of distributed coordinated function (DCF) are:

Interframe space


Duration/ID field


Carrier Sense


Random backoff timer

The period of time that exist between transmissions of wireless frames is called what?

Interframe space (IFS)

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)

The two most common interframe spaces used are:

SIFS and DIFS

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

This maintains a prediction of future traffic on the medium based on Duration value information.

Network allocation vector (NAV)

Point coordination function cannot be utilized in an ________ network because no AP exists in an independent basic service set (IBSS)

ad-hoc

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)

The two ways that a carrier sense is performed are:

virtual carrier sense and physical carrier sense

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)

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.