Free PW0-100 Exam Braindumps (page: 77)

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What stream cipher is used for encryption as part of WEP?

  1. DES
  2. RC4
  3. SSL
  4. 3DES

Answer(s): B

Explanation:

Wired Equivalent Privacy (WEP) was intended to provide the same level of privacy over wireless networks that one would expect from wired networks. WEP is part of the IEEE 802.11 standard document, and defines how encryption must support the authentication, integrity, and confidentiality of packets transmitted using wireless equipment. The IEEE standards committee chose to use RC4, a proven encryption algorithm, for wireless security. All wireless vendors support 802.11.



The measure of 1 mW of power is equivalent to which of the following logarithmic units of measure?

  1. 0 dB
  2. +10 dB
  3. +10 dBi
  4. 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



Which of the following statement indicates a key principle of RF propagation and communication?

  1. The range of RF transmissions increases as the frequency in use increases.
  2. Even if low RF signal strength is indicated, signal quality may be high enough for good communication.
  3. Low signal quality, when coupled with high signal strength, always yield good communication.
  4. Due to the distance involved, sun spots do not affect RF communication.

Answer(s): B



Earth Bulge is a factor when planning wireless data transmission paths longer than what length?

  1. 3 miles / 4.8 kilometers
  2. 7 miles / 11.2 kilometers
  3. 15 miles / 24 kilometers
  4. 22 miles / 35.2 kilometers

Answer(s): B

Explanation:

The ESTeem Model 192E is a IEEE 802.11b compatible wireless LAN transceiver that can used to build a Wireless Local Area Network (WLAN) for line-of-sight distances to 7 miles for fixed base and mobile applications.
Earth bulge must be calculated into tower height for radio links greater than 7 miles.


Reference:

CWNA official Study Guide, Pg. 352






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