QUESTION: 109

Because of the limited number of non-overlapping channels available in the 2.4 GHz 802.11b standard, what is the maximum number of access points that can be co-located without causing contention in the wireless network?

1
2
3
15

Answer(s): C

Explanation:

This question is slightly ambiguous. Since it does not use the word "theoretical max." or "practical max.", there really can be 2 answers to this. However, since the study guide mentions that for most purposes (including channel re-use), 3 co-locatable systems can be setup, thus the answer should be C (3) Note: 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.

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QUESTION: 110

1mW of power is the equivalent to which of the following?

0dB
+10dB
+10dBi
0 dBm

Answer(s): D

Explanation:

For absolute measurements, the reference power P2 is defined at 1 milliwatt, hence dBm, and 0 dBm = 1 mW:
dBmPower unit mWpower unit dBmPower unit mWpower unt
+20 100 mW -30 1 µW
+10 10 mW -40 100 nW
0 1 mW -50 10 nW
-10 100 µW -60 1 nW
-20 10 µW -70 100 pW

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