The number of simultaneously active co-located systems is more scalable with which spread spectrum technology?
Answer(s): A
It is clearly stated in the study guide that FHSS systems are more co-locatable than DSSS systems. Specifically you can co-locate upto 26 FHSS systems (non-synchronised), where as only 3 are allowed with DSSS systems. Thus, in this question, the answer is A (FHSS).
An advantage of DSSS over FHSS is:
Answer(s): D
An understood advantage and also one of the biggest advantages of DSSS systems over FHSS systems is greater system throughput (speed). In DSSS, speeds of upto 11 mbps can be acheived whereas FHSS only allows a max. of 2 Mbps (while simultanously operating in 802.11 compliant mode).
DSSS systems use what type of modulation when transmitting at 2 Mbps?
Answer(s): B
Narrowband RF interference will cause significant problems for implementing of which of the following technologies?
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, the answer should be B (DSSS).
Direct Sequence Spread Spectrum (DSSS) technology uses Mhz carriers on which to transmit data.
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.
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