Cisco Specialist-certification Exam 642-066

Which of the following statements is TRUE?

A. Both IEEE 802.11b and IEEE 802.11g operates at the 2.4 GHz radio frequency band
while Bluetooth operates at 5.0 GHz.
B. IEEE 802.11a operates 250-503 at the 2.4 GHz radio frequency band and has a maximum
transmission speed of 11 Mbps.
C. Both Bluetooth and IEEE 802.11g operates at the 2.4 GHz radio frequency band but
Bluetooth does not interfere with IEEE 802.11g 642-054 because it uses a frequency hopping
spread spectrum signaling method while IEEE 802.11g uses a direct sequence spread
spectrum signaling method.
D. IEEE 802.11a and IEEE 802b are compatible because they operate at the same 2.4
GHz radio frequency band.
Answer: C
Explanation:
Bluetooth and IEEE 802.11g uses different spread spectrum signaling methods which
prevents interference between that two. 642-055 Bluetooth uses the frequency hopping spread
spectrum (FHSS) signaling method while IEEE 802.11g uses a direct sequence spread
spectrum (DSSS).

Incorrect Answers:
A: IEEE 802.11b, IEEE 802.11g and Bluetooth 642-061 all use the 2.4 GHz frequency band
frequency band.
B: IEEE 802.11a operates at the 5 GHz radio frequency band, not the 2.4 GHz radio
frequency band and has a maximum transmission speed of 54 Mbps, not 11 Mbps.
D:
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IEEE 802.11a and IEEE 802.11b are not compatible because IEEE 802.11a operates at
the 5 GHz radio frequency band while IEEE 802.11b operates at the 2.4 GHz radio
frequency band.

References:
David Groth and Toby Skandier, Network+ Study Guide (4th Edition), Sybex, Alameda
CA, 2005, pp. 249-252