Chapter 7 Answers to Review Questions
1. The process of planning a wireless LAN to meet the stated design goals is known
as a(n)
a. network planning report (NPR)
b. instrument review
c. documentation report
d. site survey
2. Each of the following is a design goal of a site survey except
a. implement a wired network infrastructure
b. achieve the best possible performance from a WLAN
c. determine the best location for access points
d. develop wired networks optimized for a variety of applications
3. Each of the following are times that a site survey should be performed except
a. before installing a new wireless network
b. before changing an existing wireless network
c. after adding a wired user to the subnet
d. when there are significant changes in personnel
4. Access points used as wireless tools in site surveys should have the ability to
adjust the
a. output power
b. antenna width
c. spectrum allocation
d. frame count
5. A device that converts direct current from a battery to alternating current is a(n)
a. DC-to-AC converter
b. AC-to-DC converter
c. Universal Power Adapter (UPA)
d. Power Converter (PC)
6. A site survey analyzer is a measurement tool that is designed for conducting a
wireless LAN site survey. True or False?
7. A spectrum analyzer scans the entire radio frequency spectrum (2.4 GHz for
802.11b and 802.11g or 5 GHz for 802.11a) and provides a graphical display of
the results. True or False?
8. A network analyzer, sometimes called a packet sniffer or protocol analyzer, is
extensively used in the placement of the access point itself. True or False?
9. There is no industry-standard form for site survey documentation. True or False?
10. One important documentation tool is a digital camera. True or False?
11. The most common business requirement is that a wireless network provides
______ to its users. mobility
12. If a(n) _____ antenna is being used then the AP should be placed in the center of
the room or coverage area as much as possible. omnidirectional
13. If a(n) _____ antenna is used then the AP should be positioned in one corner of
the room. semi-directional
14. The _____ pattern is the area in which the signal can be received from the AP.
coverage
15. The _____ range is the farthest distance in which the signal can be received by the
wireless device. transmission
16. List three additional steps that should be taken when performing an outdoor site
survey.

If the survey is taken in the fall or winter after deciduous
trees and bushes have lost their foliage, these should be noted
because they could impact the RF signal after the leaves have
grown back.

Climatic conditions may need to be taken into account. In
areas with large amounts of rainfall or fog, these elements
should be considered in the placement of the AP or
transmitter.

If the antenna must be installed on a rooftop then there
should be ready access to that location.

Permits and zoning ordinances must also be carefully noted
as non-RF information as well.
17. What should be included in the narrative of a site survey report?
The narrative section should begin by stating the requirements from the customer
regarding what they wanted from the site survey. This ensures that the material in
the report has a clear focus on what problems are being addressed. The narrative
section should also outline how the survey was conducted, know as the methodology.
It is important to clearly outline in this section all of the steps that were taken in
preparation as well as in conducting the actual survey itself. This makes it clear to
the reader that the survey follows a recognized and methodical pattern, and
shortcuts or questionable actions were not taken. The narrative section should also
clearly reveal the results of the measurements.
18. List five times that a site survey should be conducted.

Before installing a new wireless network – It is important to evaluate the
placement of the access points and antennas throughout the proposed site in
order to meet the design goals.

Before changing an existing wireless network - When modifying or extending
an existing network structure, it is important to re-evaluate the placement of
the access points and antennas.

When there are significant changes in personnel – Adding several new
employees to an office or moving employees from one area to another area
may necessitate a new site survey.

When there are changes in network needs - If employees are performing
significantly different duties, such as downloading large files on a regular
basis, then a new site survey should be performed.

After making physical changes to a building - Remodeling may introduce
new sources of interference, such as motors and metal structures within the
coverage area of the access point.
19. Describe two types of antennas that should be used on an AP when conducting a
site survey.
A requirement for an access point used in a site survey is to have external antenna
connectors. This allows for different configurations of antennas to be connected to
the AP in order to perform different types of tests. An omnidirectional antenna
radiates its signal out in all directions equally. If a high-gain dipole antenna is
placed in the same position, however, the signal is pattern is different. It may be
necessary to test omnidirectional and high-gain dipole antennas to determine the
best signal pattern for the area. Semi-directional and highly-directional antennas
are used for longer distances and are not commonly attached to a standard AP
20. Describe the two types of spectrum analyzers.
A spectrum analyzer scans the entire radio frequency spectrum (2.4 GHz for
802.11b and 802.11g or 5 GHz for 802.11a) and provides a graphical display of the
results. These results generally include a signal-to-noise ratio measured in dB
illustrated as a graph. Another type of spectrum does not continuously scan the
entire frequency spectrum but instead only looks at the signal-to-noise ratio on the
frequency on which the device is transmitting. Although not as helpful as a
spectrum analyzer, these single-frequency analyzers, nevertheless can provide useful
information.