Direct Sequence Spread Spectrum (DSSS) technology uses Mhz carriers on which to transmit data.
Answer(s): A
DSSS utilizes 1 Mhz carriers (Chapter 3, page 76).
Which of these has an effect on Wireless LAN throughput? (Choose two)
Answer(s): A,B
Wireless LAN throughput is affected by the distance between the transmitter and receiver (lesser distance, lesser error-rate, thus greater throughput) and the amount of fragmentation being utilized. The lesser the fragmentation, the fewer packets need to be sent and the greater the throughput. Therefore, the answer should be A, B.
Wireless LAN throughput is based, in part, on which two of these?
Answer(s): A,C
Wireless LAN throughput is also affected by usage of Proprietary data-link layer protocols and RTS/CTS. Using RTS/CTS increases overhead over the network due to the continous handshaking process for each packet sent on the network. This reduces WLAN throughput. Thus the answer should be A, C.
Which spread spectrum technology is recommended for environments that have narrowband interference?
Answer(s): C
According to the study guide, FHSS systems are more resistent to Narrowband interference then DSSS systems. This is due to the agility of FHSS systems and their utilization of the entire 2.4 Ghz band (83.5 Mhz). Since HomeRF is an FHSS implementation and IrDA does not utilize RF technology.
Wireless LAN throughput is partially based on which of the following variables?
Answer(s): B,C
Infrared (IR) is a light-based transmission technology and is not spread spectrum-spreadspectrum technologies all use RF radiation. IR devices can achieve a maximum data rate of 4 Mbps at close range, but as a light-based technology, other sources of IR light can interfere with IR transmissions. The typical data rate of an IR device is about 115 kbps, which is good for exchanging data between handheld devices. An important advantage of IR networks is that they do not interfere with spread spectrum RF networks. For this reason, the two are complementary and can easily be used together.
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