Flashcards
00 Exam Terms
Flashcards do conjunto (52)
- 1Active ModePower management of a station. Always in an awake state.
- 2Adjacent Overlapping ChannelChannels that are directly next to each other and overlapping.
- 3Adjacent Non-overlaping ChannelChannels that are not overlapping such as 1, 6, and 11
- 4Adjacent Channel InterferenceWhen two or more radios are providing RF coverage to the same physical area on overlapping frequencies
- 5A-MSDUContains multiple MSDUs, transported in a single MSDU or multiple MSDUs.
- 6A-MPDUContains multiple MPDUs, transported as a single PSDU by the PHY
- 7Announcement Traffic Indication Message (ATIM)Frame sent between peers in an Ad Hoc network indicating that data is awaiting delivery to the station that receives the ATIM frame
- 8Autonomous Access PointAccess point containing full MAC layer processing locally on the AP. Also known as "fat" or "thick" APs.
Required individual management. - 9Channel Stacking / Channel Spanning / Channel BlanketsUsed in Single Channel Architectures with WLANs being co-located in the same physical area on different 802.11 channels.
- 10Co-channel InterferenceOccurs when two access point radios are providing RF coverage to the same physical area using the same channel.
- 11Controller-based access pointAccess point part of a controller system. Also called "Split MAC" architecture. WLAN controllers communicate with controller-based APs (also called lightweight or thin).
Controller does most of the intelligence in architecture. - 12DSSSDirect Sequence Spread Spectrum
Clause 15. Specified in 802.11-1999.
Uses 1 and 2 Mbps data rates.
Supported by 802.11b and 802.11g - 13DSSS-OFDMOptional ERP modulation.
Specified in 802.11g amendment.
Combines DSSS preamble and header with an OFDM payload transmission.
Data rates of 6, 9, 12, 18, 24, 36, 48, and 54 Mbps - 14Dynamic Rate Switching (DRS)Used in 802.11g
Stations can change their data rate as they move toward or away from an AP to maintain high quality connection - 15Enterprise Encryption Gateway (EEG)L2 encryption device
Strong authentication and encryption - 16ERPExtended Rate Physical (clause 19)
Rate extension of the PHY for DSSS of Clause 15 and Clause 18 (HR/DSSS) - 17ERP-DSSSRequired ERP modulation specified by 802.11g amendment.
Has exceptions:
Support of short PLCP PPDU header
CCA
Max input signal level is -20 dBm
Locking transmit center frequency and symbol clock frequency to the same reference oscillator is mandatory - 18ERP-OFDMRequired ERP modulation specified by 802.11g amendment
Exceptions:
Frequency plan in accordance with 18.4.6.1 and 18.4.6.2
CCA
Frequency accuracy is +/- 25 PPM
Max input signal level is -20 dBm
Slot time is 20 microseconds
SIFS time is 10 microseconds - 19ERP-PBCCOptional ERP modulation in 802.11g
Single carrier modulation - 20Fast BSS Transition (FT) / Fast Secure Roaming (FSR)Fast, secure handoffs between APs within an ESS.
Uses Robust Security Network features
Roams using 4-Way handshake (802.11i) or over-the-air / over-the-DS exchanges (802.11r FT) - 21High ThroughputRepresents 802.11 Clause 20 PHY
MIMO is used - 22HR/DSSS definition, data rates, supported by...High Rate Direct Sequence Spread Spectrum
Introduced 5.5 and 11 Mbps data rates
Backwards compatible with DSSS
First supported by 802.11b
Supported by 802.11g - 23IEEE 802.3-2005 Clause 33 PoERefers to Power over Ethernet
802.3af
DC power over Category 5 or greater - 24IEEE 802.11 standard802.11-2007
- 25Information ElementAre flexible data structures within 802.11 management frames
- 26Information FieldFixed-length, mandatory component in 802.11 management frames
- 27MMPDUMedium Access Control (MAC) Management Protocol Data Unit
Unit of data exchanged between two peer MAC entities using services of the PHY - 28MPDUMedium Access Control (MAC) Protocol Data Unit
Exchanged between two peer MAC entities using the services of the PHY.
Comprised of MSDU, MAC header, and a trailer - 29MSDUMedium Access Control (MAC) Service Data Unit
Data presented to MAC service access point by upper layer protocols
Can be comprised of data from LLC sublayer and/or any number of layers above the Data Link layer - 30MCAMultiple Channel Architecture
Three or more channels used - 31Non-ERPNon Extended Rate Physical (clauses 15 and 18)
Stations not ERP STAs but can interoperate with ERP STAs, specifically DSSS and HR/DSSS - 32OctetDescribes 8 bits of data
- 33OFDM, amendment use, frequency, and data ratesOrthogonal Frequency Division Multiplexing
Introduced with IEEE 802.11a
Used in 5 GHz
6, 9, 12, 18, 24, 36, 48, and 54 Mbps
Mandatory of 6, 12, and 24 Mbps
Not backwards compatible with HR/DSSS or DSSS - 34Power Save (PS) modePower management of a station
Operates in active mode or power-save mode
STA in power-save mode is in awake or doze state
Also known as Power Save Poll (PSP) - 35Robust Security Network (RSN)Network that allows only robust security network associations (RSNAs)
Can be identified in RSN Information Element of beacon frames - 36Single Channel Architecture (SCA)All APs deployed on one channel in 2.4 GHz or 5 GHz
Transmissions coordinated by a WLAN controller on single 802.11 channel - 37Unlicensed National Information Infrastructure (UNII) Bands5.15 - 5.25 Lower UNII-1
5.25 - 5.35 Middle UNII-2
5.470 - 5.725 GHz Extended UNII-2E
5.725 - 5.825 GHz Upper UNII-3 - 38Lower UNII-15.15 - 5.25 GHz
- 39Middle UNII-25.25 - 5.35 GHz
- 40UNII-2 Extended5.470 - 5.725 GHz
- 41Upper UNII-35.725 - 5.825 GHz
- 42Virtual BSSID / Virtual CellWhen 2 or more access points coordinated by a WLAN controller appear to be the same access point and have the same BSSID
- 43VoWiFi / VoWi-Fi / wVoIP / VoWLAN / VoFiRefers to transmitting voice over Internet Protocol over an 802.11 data link
- 44Wi-Fi AllianceFormally known as Wireless Ethernet Compatibility Alliance (WECA)
Nonprofit formed in 1999
Certifies interoperability of WLAN products based on IEEE 802.11 standard and amendments - 45Wi-Fi Multimedia (WMM), amendmentCreated by Wi-Fi Alliance for support of multimedia applications with QoS
Started with 802.11e - 46WMM Access CategoriesVoice
Video
Best effort
Background - 47WNMSWireless Network Management System
Monitoring, configuring, and updating autonomous access points or WLAN controllers w/ controller-based access points - 48WLAN ControllerAlso known as a WLAN switch
Communicate with lightweight or thin access points
Often called Split MAC architecture - 49WLAN ProfileGroup of settings within an 802.11 WLAN controller that has parameters for a client to connect to the network infrastructure
- 50WMM-PS or U-APSDIEEE 802.11e amendment
Automatic Power Save Delivery (APSD) - 51WPA-Enterprise and WPA2-Enterprise, amendmentLeverages IEEE 802.1X
Uses EAP
802.11i amendment - 52WPA-Personal - and WPA2-PersonalDesigned for SOHO
Uses PSK instead of 802.1X/EAP