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CIT228 Chapter 6

CIT228 Wireless Networks Chapter 6 - Media Access Control

QuestionAnswer
access category (AC) The classes of an EDCA.
active scanning A process in which a station first sends out a management probe request frame on an available channel.
ad hoc mode A wireless network that does not use an AP.
Aggregate MAC Protocol Data Unit (A-MPDU) A data unit that allows multiple MPDUs to be aggregated together.
Aggregate MAC Service Data Unit (A-MSDU) A data unit that allows multiple MSDUs to be combined together.
Arbitration IFS (AIFS) An interframe space that is used when setting priorities to different types of transmissions.
association The final step in the process of a station being accepted into the wireless network.
authentication The process of a station being accepted by the AP into the WLAN.
backoff interval A random amount of time that two sending devices pause after a collision.
Basic Service Area (BSA) The physical area of RF coverage provided by the AP of a BSS.
Basic Service Set (BSS) One or more stations that are served by a AP.
Basic Service Set Identifier (BSSID) The media access control (MAC)
beaconing The process by which the AP sends a beacon frame to both announce its presence and to provide the necessary information for wireless stations wanting to join the network.
block acknowledgment An IEEE 802.11n feature that supports multiple MPDUs in an A-MPDU.
broadcast probe A probe request frame sent by a station with a null value as the SSID so that all APs will respond.
care-of address A new and temporary IP number assigned in Mobile IP.
Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) The IEEE 802.11 standard that is designed to handle collisions when they occur.
Carrier Sense Multiple Access with Collision Detection (CSMA/CD) A channel access method used by Ethernet.
carrier sensing The process in which a network device first listens on the wire to see if any
other device is currently transmitting.
challenge text The text that is encrypted in shared key authentication.
channel access methods The different ways of sharing the network medium.
contention A channel access method in which devices contend or compete with each other to use the network medium.
control frames Frames that provide assistance in delivering frames that contain the data by controlling access to the medium.
CTS-to-self A process used when 802.11g devices are mixed with 802.11b devices together.
data frame Frame that carries the information to be transmitted to the destination device.
directed probe A probe request frame sent by a station that contains a specific SSID that the device is searching for.
Distributed Coordination Function (DCF) The standard IEEE 802.11 contention method.
Distributed Coordination Function IFS (DIFS) An interframe space that is the standard interval between the transmission of data frames.
distribution system (DS) A system that is used by an AP to determine what communication needs to take place with other APs in the ESS or with the wired network.
distribution system media The media, either wired network, a wireless radio, or special purpose device, that interconnects APs.
dynamic rate switching A technology that allows a station farther away from an AP to still remain connected to the network but at a slower speed.
Enhanced Distributed Channel Access (EDCA) An HCF that divides transmissions into four different classes.
Extended IFS space (EIFS) An interframe space that is used when frames must be retransmitted.
Extended Service Set (ESS) Two or more BSS networks that are interconnected.
foreign agent A device that provides routing services to the mobile computer in Mobile IP.
foreign network A different network in Mobile IP.
frame acknowledgment An acknowledgment frame sent by the receiving device back to the sending device to confirm that the data frame arrived intact.
Greenfield Mode A mode in which all of the stations in the BSS or ESS are 802.11n devices operating at the same HT speed with the same parameters.
handoff The process by which a station associates with a new AP.
HCF Controlled Channel Access (HCCA) The process of using polling along with centralized scheduling that is controlled by the AP.
hidden node problem A station that is within range of an AP but not another station.
home agent A forwarding mechanism in Mobile IP that keeps track of where the mobile computer is located.
HT 20 MHz Protection Mode An HT Operation Mode in which a 20-MHz-only HT device associated with a 20/40-MHz AP cannot transmit simultaneously with a 40-MHz device.
HT Dual-CTS Protection A protection mechanism used with 802.11n devices in a mixed environment with 802.11a/b/g devices.
HT L-SIG Protection A protection mechanism used with 802.11n devices in a mixed environment with 802.11a/b/g devices.
HT Mixed Mode A mode in which both 802.11n and 802.11a/b/g devices can interoperate in the same BSA.
HT Nonmember Protection Mode A mode in which all stations use the non-HT 802.11a/b/g format to ensure backwards compatibility.
HT Operation Modes Different modes that allow faster HT devices to interoperate with slower devices.
hybrid coordination function (HCF) The IEEE 802.11 optional function that allows for different types of wireless traffic to be given different levels of priority.
Independent Basic Service Set (IBSS) A wireless network that does not use an AP.
infrastructure mode A wireless network that uses an AP.
interframe spaces (IFS) The standard spacing intervals between the transmissions of the data frames.
jumbo frame support The ability of network devices to accept frames that are between 1,500 and 9,000 bytes.
Layer 2 roaming A roaming process that occurs between APs on the same subnet.
Layer 3 roaming A roaming process that occurs between APs on a different subnet.
MAC Protocol Data Unit (MPDU) A data unit that is simply an IEEE 802.11 frame.
MAC Service Data Unit (MSDU) A data unit that contains data from Layers 3-7 along with LLC data.
management frames Frames that are used to set up the initial communications between a device and the access point (for infrastructure mode)
maximum transmission unit (MTU) The frame size in an IEEE 802.11 network.
Mobile IP A mechanism within the TCP/IP protocol to better support mobile computing.
net allocation vector (NAV) The field in which the time reserved for the medium in RTS/CTS is stored.
open system authentication The process of a station sending an association request frame to an AP to be accepted into the WLAN.
passive scanning A process in which a station changes to the different channels that it supports and listens for a beacon frame for a set period of time.
peer-to-peer A wireless network that does not use an AP.
PLCP Protocol Data Unit (PPDU) A data unit that is created by adding a header and other information to it.
PLCP Service Data Unit (PSDU) The result of the PMDU sent to the PLCP sublayer.
Point Coordination Function (PCF) The IEEE 802.11 optional polling function.
Point Coordination Function IFS (PIFS) An interframe space used by a device to access the medium after it has been asked and then given approval to transmit.
polling A channel access method in which each device is polled or asked in sequence if it wants to transmit.
Protocol Data Unit (PDU) A unit of data that will be sent to the peer protocol layer at the receiving device instead of that being sent to a lower layer level.
Reduced IFS (RIFS) An interframe space that is used by 802.11n devices to reduce the amount of “dead space” required between OFDM transmissions.
Request to Send/Clear to Send (RTS/CTS) An optional IEEE 802.11 channel access method that reserves the medium for a period of time.
roaming The movement between cells.
RTS threshold Transmitted short data packets without RTS/CTS.
Service Data Unit (SDU) A specific unit of data that has been passed down from a higher OSI layer to a lower layer but has not yet been encapsulated by that lower layer.
Service Set Identifier (SSID) A logical network name that is a unique identifier to differentiate WLANs.
shared key authentication The process of a station encrypting text in order to be accepted into the WLAN.
Short IFS (SIFS) An interframe space used for immediate response actions such as ACK and has the highest level of priority.
slot time The amount of time that a station must wait after the medium is clear.
transmission opportunities (TXOP) The process of scheduling access to the channel by allocating to the stations.
virtual carrier sensing An optional polling IEEE 802.11 channel access method.
wireless distribution system (WDS) A distribution system that provides services through a wireless infrastructure.
Created by: Leisac