unit 5 Flashcards
How many active slaves can be handled by a master equiped with Bluetooth?
seven
In wireless networks, since collisions cannot be directly detected, what method is employed to deduce that a collision has occurred?
acknowledgements (ACKS)
____________ has two key components: tags and readers. RFID tags are small, inexpensive devices that have a unique 96-bit EPC identifier and a small amount of memory that can be read and written by the RFID reader.
EPC Gen 2 RFID
_____________ is a collection of computers that are associated so that they can directly send frames to each other on wireless networks.
ad hoc network
802.11 tries to avoid collisions with channel sensing before sending and exponential backoff after collisions. What protocols are used for 802.11?
CSMA/CA
To reduce ambiguities about which station is sending, 802.11 defines channel sensing to consist of both physical sensing and virtual sensing. Physical sensing checks the medium to see if there is a valid signal. With virtual sensing, each station keeps a logical record of when the channel is in use by tracking _______________.
network allocation vector
What is the interval between regular data frames in IEEE 802.11 called?
DIFS
What is NOT a class of the services for 802.16 MAC Sublayer protocols?
real time variable bit rate service
. In response to customer requests for more flexibility, network vendors began working on a way to rewire buildings entirely in software. The resulting concept is called a ____________.
Virtual LAN
What is a basic unit of a Bluetooth system?
piconet
