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CWNP PW0-100 Exam Questions
PW0-100 Wireless LAN Administration, Certified Wireless Network Administrator (CWNA) (Page 11 )

Updated On: 24-Feb-2026
Page 11 of 122
PDF with 477 Questions

Identify all true statements below.

  1. FHSS is inherently more secure than DSSS.
  2. FHSS uses frequently agility to enhance security.
  3. The FHSS hopset can be determined by listening to traffic on each of the hopping channels.
  4. Both FHSS and DSSS rely on user authentication and data encryption for security.

Answer(s): C

Explanation:

A frequency hopping system will operate using a specified hop pattern called a channel. Frequency hopping systems typically use the FCC's 26 standard hop patterns or a subset thereof. Some frequency hopping systems will allow custom hop patterns to be created, and others even allow synchronization between systems to completely eliminate collisions in a co-located environment.


Though it is possible to have as many as 79 synchronized, co-located access points, with this many systems, each frequency hopping radio would require precise synchronization with all of the others in order not to interfere with (transmit on the same frequency as) another frequency hopping radio in the area. The cost of such a set of systems is prohibitive and is generally not considered an option. If synchronized radios are used, the expense tends to dictate 12 co-located systems as the maximum. In frequency hopping systems, the carrier changes frequency, or hops, according to a pseudorandomsequence. The pseudorandom sequence is a list of several frequencies to whichthe carrier will hop at specified time intervals before repeating the pattern. The transmitteruses this hop sequence to select its transmission frequencies. The carrier will remainat a certain frequency for a specified time (known as the dwell time), and then use asmall amount of time to hop to the next frequency (hop time). When the list of frequencieshas been exhausted, the transmitter will repeat the sequence.
In order for a frequency hopping system to be 802.11 or
OpenAir compliant, it must operate in the 2.4 GHz ISM band (which is defined by the FCC as being from 2.4000 GHz to 2.5000 GHz). Both standards allow operation in the range of 2.4000 GHz to 2.4835 GHz.



What is a disadvantage of having a short dwell time when using a FHSS system?

  1. Decreased range.
  2. Decreased data throughput.
  3. Decreased security.
  4. Decreased resistance to narrowband interference.

Answer(s): B

Explanation:

When a frequency hopping radio jumps from frequency A to frequency B, it must change the transmit frequency in one of two ways. It either must switch to a different circuit tuned to the new frequency, or it must change some element of the current circuit in order to tune to the new frequency. In either case, the process of changing to the new frequency must be complete before transmission can resume, and this change takes time due to electrical latencies inherent in the circuitry. There is a small amount of time during this frequency change in which the radio is not transmitting called the hop time. The hop time is measured in microseconds (µs) and with relatively long dwell times of around 100-200 ms, the hop time is not significant. A typical 802.11 FHSS system hops between channels in 200-300 µs.
With very short dwell times of 500 - 600µs, like those being used in some frequency hoppingsystems such as Bluetooth, hop time can become very significant. If we look at theeffect of hop time in terms of data throughput, we discover that the longer the hop timein relation to the dwell time, the slower the data rate of bits being transmitted. This translates roughly to longer dwell time = greater throughput.



What does the PRNG acronym stand for in regards to the WEP protocol?

  1. Passive Request Next Generation.
  2. Pseudorandom Number Generator.
  3. Protected Result Null Group.
  4. Persistent Routing Network Gateway.

Answer(s): B

Explanation:

The IEEE 802.11 standard specifies the use of WEP.
WEP is a simple algorithm that utilizes a pseudo-random number generator (PRNG) and theRC4 stream ciphe r



Which of the following is true of a 2.4 GHz RF link at a distance of 5 miles (8 kilometers).
(Choose all that apply)

  1. RF Line of Sight is required.
  2. Visual Line of Sight is required.
  3. Earth bulge must be factored into calculations.
  4. The Fresnel Zone must be at least 60% clear of obstructions.
  5. High gain omni-directional antenna.

Answer(s): A,D

Explanation:

From the study guide, Visual LOS is not required for a successful point-to-point connection. However RF LOS is required. Additionally, the Fresnel zone must be at least 60% clear of obstructions. Earth bulge is only factored in for greater then 7 mile links.



Which two RF spread spectrum technologies does IEEE specify in the 802.11 standard? (Choose two)

  1. Infrared
  2. Frequency Hopping
  3. Direct Sequencing
  4. Wide Band

Answer(s): B,C

Explanation:

REF FOR B: a typical 802.11 frequency hopping WLAN might be implemented as an enterprise wireless networking solution while HomeRF is only implemented in home environments due to lower output power restrictions by the FCC OR
Frequency agility refers to the radio's
ability to change transmission frequency abruptly within the usable RF frequency band. In the case of frequency hopping wireless LANs, the usable portion of the 2.4 GHz ISM band is 83.5 MHz, per FCC regulation and the IEEE 802.11 standard.
REF FOR C//
In the 2.4 GHz ISM band, the IEEE specifies the use of DSSS at a data rate of 1 or 2 Mbps under the 802.11 standard.Under the 802.11b standard-sometimes called highrate wireless-data rates of 5.5 and 11 Mbps are specified.






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