Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
80 Cards in this Set
- Front
- Back
|
Will OFDM clause 17 radio interference with ERP clause 19 radio?
|
NO, OFDM radios transmit in the 5 GHz bands and ERP radios transmit in the 2.4 GHz band
|
|
|
Will OFDM radio interfere with HR-DSSS radio?
|
NO,
|
|
|
Which 802.11 amendments is often referred to as Wireless InterWorking with External Networks (WIEN)?
|
802.11u
|
|
|
What does the WEP stand for?
|
Wild Equivalent Privacy
|
|
|
What are the required HR-DSSS data rates as defined by the 802.11-2007 standard?
|
1, 2,5.5 and 11 Mbps
|
|
|
What are the data rates for DSSS as defined by 802.11?
|
1,2 Mpbs
|
|
|
What are the data rates for FHSS as defined by 802.11?
|
1,2 Mpbs
|
|
|
What are the required data rates for OFDM as defined by 802.11a?
|
6,12,24 Mbps
|
|
|
What are the supported data rates for OFDM as defined by 802.11a?
|
6,9,12,18,24,36,48 and 54 Mbps
|
|
|
What are the required data rates for ERP-OFDM as defined by 802.11g?
|
6,12,24 Mbps
|
|
|
What are the supported data rates for ERP-OFDM as defined by 802.11g?
|
6,9,12,18,24,36,48 and 54 Mbps
|
|
|
The 802.11b amendment specified what type of radio device?
|
ER-DSSS
|
|
|
The 802.11a amendment specified what type of radio device?
|
OFDM
|
|
|
The 802.11g amendment specified what type of radio device?
|
ERP-OFDM and ERP-DSSS/CCK
|
|
|
what allows DSSS and OFDM technologies to coexit in the 2.4 GHz ISM band?
|
Protection mechanism
|
|
|
The original 802.11 standard defined what PHY?
|
FHSS, DSSS and Infrared
|
|
|
The 802.11b amendment mandated which PHY?
|
HR-DSSS
|
|
|
The 802.11a amendment mandated which PHY
|
OFDM
|
|
|
HT clause 18 radios transmit in what frequency bands?
|
5 GHz UNII bands and 2.4 GHz ISM bands
|
|
|
Legacy FHSS clause 14 and legacy DSSS clause 15 radios transmit in what frequency band?
|
2.4 GHz ISM bands
|
|
|
HR-DSSS clause 18 radio transmit in what frequency band?
|
2.4 GHz ISM bands
|
|
|
ERP clause 19 radio transmit in what frequency band?
|
2.4 GHz ISM bands
|
|
|
OFDM clause 17 radio transmit in what frequency band?
|
5 GHz UNII bands
|
|
|
Are 802.11b radios backward compatible with 802.11 radios?
|
Yes, but not 802.11 FHSS or Infrared devices
|
|
|
Give two reasons why 802.11a can not backward compatible 802.11b?
|
Frequency and RF technologies.
|
|
|
Will 802.11a radio interfere with 802.11b/g radio?
|
No, different frequencies
|
|
|
What are the operational modes of an 802.11g(ERP) AP?
|
B-only, G-only and B/G mixed mode
|
|
|
The 802.11g amendment defined which PHY as optional?
|
ERP-PBCC and DSSS-OFDM
|
|
|
What is the frequency space of the 2.4 GHz ISM band?
|
2.4 GHz ~ 2.4835 GHz
|
|
|
The 802.11b amendment defined which PHY as optional?
|
PBCC
|
|
|
The 802.11h amendment defined what two mechanisms?
|
Dynamic frequency selection(DFS)
Transmitted power control (TPC) |
|
|
Dynamic frequency selection is designed for what purpose?
|
To avoid interfering with radar transmission in the 5 GHz UNII band
|
|
|
The 802.11i amendment mandated which type of encryption?
|
Counter Mode with Cipher Block Chaining Message Authentication Code Protocol (CCMP)
|
|
|
The 802.11i amendment optional which type of encryption?
|
Temporal Key Integrity Protocol (TKIP)
|
|
|
The 802.11e amendment defined what type of mechanisms at layer 2?
|
Quality of service (QoS)
|
|
|
What is the main function that was defined by the 802.11e amendment?
|
Hybird Coordination Function (HCF)
|
|
|
What is the QoS certification of the Wi-Fi Alliance?
|
Wi-Fi Multimedia (WMM)
|
|
|
Which 802.11 draft defines the use of MIMO antenna technology?
|
802.11n
|
|
|
Which 802.11 amendment is known as the fast secure roaming amendment?
|
802.11r
|
|
|
Which 802.11 draft defines the use of wireless mesh networking ?
|
802.11s
|
|
|
Which 802.11 draft is known as the protected management frame amendment?
|
802.11w
|
|
|
802.11n draft can transmit in which frequency band?
|
It can transmit in 2.4 GHz ISM band and all four of the 5GHz UNII band
|
|
|
In North America, the 802.11 standard designates what frequency space for use of FHSS transmission?
|
FHSS will use 79MHz of frequencies, from 2.402 GHz to 2.480 GHz.
|
|
|
OFDM uses how many 312.5 KHZ subcarriers for transmitting data?
|
OFDM uses 52 subcarriers, buy only 48 of them carry data. The other 4 subcarriers are used as pilot carriers.
|
|
|
What is the measurement of resistance to an alternating current?
|
Impedance
|
|
|
A _____ signal is a signal where the bandwidth wider than what is required to carry the data.
|
Spread spectrum
|
|
|
A narrowband signal is characterized by _____ frequency bandwidth and ____ amplitude.
|
narrow, strong
|
|
|
A spread spectrum signal is characterized by _____ frequency bandwidth and ____ amplitude.
|
wide, low
|
|
|
What is the term that describes the period when an FHSS radio card moves between carriers?
|
Hop time
|
|
|
What is the term that describes the period when an FHSS radio card is transmitting on a specific frequency?
|
Dwell Time
|
|
|
What is frequency range that IEEE designates for frequency hopping transmissions for 802.11 FHSS radio?
|
2.402-2.480 GHz, 79MHz wide
|
|
|
How wide are the DSSS channels in the 2.4 GHz ISM band?
|
22 MHz
|
|
|
How much theoretical frequency separation is there between channel 6 and 11?
|
25 MHz
|
|
|
The original 802.11 standard required how much separation between the center frequencies for DSSS channels to be considered nonoverlapping?
|
30 MHz
|
|
|
The original 802.11 amendment required how much separation between the center frequencies for HR-DSSS channels to be considered nonoverlapping?
|
25 MHz
|
|
|
The original 802.11g amendment required how much separation between the center frequencies for ERP-DSSS/ERP-OFDM channels to be considered nonoverlapping?
|
25 MHz
|
|
|
The original 802.11a amendment required how much separation between the center frequencies for OFDM channels to be considered nonoverlapping?
|
20 MHz
|
|
|
ERP-OFDM is more resistant to multipath than HR-DSSS?
|
Yes
|
|
|
ERP-DSSS is less susceptible to narrowband interference than FHSS?
|
No
|
|
|
Which RF technology uses convolution coding and forward error correction?
|
OFDM
|
|
|
The three original 5 GHz UNII bands are ____ wide, and each has ____ channels
|
100 MHz, 4
|
|
|
Carrier sense Multiple Access with Collision Avoidance (CSMA/CA), the aggregate throughput is typically ___ % or less of the actual data rate.
|
50%
|
|
|
What value must the network allocation vector (NAV) have before an 802.11 radio card can contend for the medium ?
|
Zeros
|
|
|
What are the types of carrier senses?
|
Virtual carrier sense and Physical carrier sense.
|
|
|
What is another name for physical carrier sense?
|
Clear channel Assessment (CCA)
|
|
|
What is another name for virtual carrier sense?
|
Network Allocation Vector (NAV)
|
|
|
What is the medium access method where all 802.11 radio cards randomly access the medium with on priority?
|
Distribution Coordination Function (PDF)
|
|
|
What is the medium access method the access point temporally take control of the medium and polls client stations?
|
Point Coordination Function (PCF)
|
|
|
An Independent basic service set can operate in PCF mode?
|
No
|
|
|
What device is point coordinator during PCF mode?
|
Access point
|
|
|
What amendment is known as the fast basic service set transition amendment?
|
802.11r
|
|
|
Which amendment defined the use of transmit power control (TPC) ?
|
802.11h
|
|
|
What amendment were added to 802.11-2007 standard?
|
802.11a,b,d,g,h,e,i,j
|
|
|
What is the method of calculating all of the gains and losses from the transmitting radio, through the RF medium to the receiver radio, to determine a bridge link reliability?
|
Link budget
|
|
|
What is the frequency space of the UNII-1 band?
|
5.15-5.25 GHz
|
|
|
What is the frequency space of the % GHz ISM band?
|
5.725-5.875 GHz
|
|
|
What is the frequency space of the 900 MHz ISM band?
|
902~928 MHz
|
|
|
What is the frequency space of the UNII-2 band?
|
5.25~5.35 GHz
|
|
|
What is the frequency space of the UNII-3 band?
|
5.725~5.825 GHz
|
|
|
What is the frequency space of the UNII-2E band?
|
5.47~5.725GHz
|
