The Institute of Electrical and Electronics Engineers (IEEE) is an engineering association dedicated to fostering technological innovation and excellence for the benefit of humanity. They develop standards, in relation to Wi-Fi, for networking communications and operations. The 802 standards commit...
CWNP Final Study Guide
The Institute of Electrical and Electronics Engineers (IEEE) is an engineering
association dedicated to fostering technological innovation and excellence
for the benefit of humanity. They develop standards, in relation to Wi-Fi, for
networking communications and operations. The 802 standards committee
focuses on developing and maintaining networking standards and
recommended practices for local, metro, and other network types. Within the
unlicensed spectrum bounds defined by the FCC in North America, the IEEE
creates the 802.11 standard. For Example, 802.11 channels as defined in the
standard must fall within the FCC unlicensed ranges. Over the years new
technology has been introduced to improve the speed and reliability of
WLANs so the 802.11 standard has been amended to include additional
features. - answer-What organization creates and manages the 802.11
standard?
The Wi-Fi Alliance further defines standards within the bounds set by the
802.11 standard. The Wi-Fi Alliance promotes interoperability between the
vendors of WLAN equipment. The Wi-Fi Alliance is an important organization
for wireless LAN (WLAN) progress. In fact, the Wi-Fi Alliance owns the "Wi-Fi"
trademark. The Wi-Fi Alliance often takes the most important aspects of the
802.11 specifications and tests those features and functions for multi-vendor
functionality. Devices are provided by product vendors to be tested, and if
the products pass the interoperability tests, they become Wi-Fi certified for a
specific technology. - answer-The Wi-Fi Alliance certifies equipment to be
compliant with IEEE standards and compatible with other Wi-Fi equipment.
IETF standards are defined with several details including:
-RFC number: you can search for this number in any search engine as "RFC
###" and quickly located and read the document. All IETF RFCs are freely
available online.
-Updated by: these are RFCs that make changes or additions to the current -
RFC.
-Obsoletes: this is the old version of the currently viewed RFC. When looking
at an old version of an RFC, you will see "Obsoleted by: ####" so that you
know a newer version is available.
-Contributors: the people or companies who helped to develop the standard.
-Name: the name of the standard is given in the opening title. For example,
the old version (RFC 2284) was named "PPP Extensible Authentication
Protocol (EAP)" but the new version (RFC 3748) is simply named "Extensible
Authentication Protocol (EAP)." - answer-IETF standards are defined through
a document called an RFC and each one has a number.
, Regulatory domains define which channels are available and other factors
such as output power settings, but they do not define the PHYs.
The correct answer is 'False'. - answer-Regulatory domains define the 802.11
standard PHYs for each domain.
In addition to the terms standard, draft, amendment and standard as
amended, it is important to know that the letters used can have significance.
For example, 802.1X is an important standard related to modern WLAN
security. It provides the port-based authentication we used in our enterprise
WLANs. However, it is often mistakenly called 802.1x, when it should be
802.1X. What is the difference?
-A lowercase letter indicates an amendment to a standard.
-An uppercase letter indicates a standard in and of itself.
-802.1X is not an amendment to some earlier port-based authentication
standard, but it is a standard for port-based authentication.
In the end, an x is not an X. - answer-What does a capital letter, such as the
D in 802.1D, indicate about an IEEE document?
The amplitude defines the strength of the signal. A higher amplitude is a
stronger signal. A lower amplitude is a weaker signal. Therefore, an
amplitude of 3 dB is stronger than 1 dB. - answer-What characteristic of an
RF wave defines its strength or power?
Higher frequencies have shorter wavelengths and lower frequencies have
longer wavelengths. - answer-Which one of the following frequencies has the
longest wavelength?
The speed of light, which is the speed at which electromagnetic waves
travel, is the constant in the relationship between frequency and
wavelength. - answer-What is the constant that results in the
interrelationship between frequency and wavelength?
Phase is a relational or comparative radio concept. Phase is a comparison of
the cycle or period of different waves. A single wave does not have a phase.
However, two waves will have a phase relationship with one another. This is
true for reflected copies of the same wave, which can have different phase
relationships. An example of phase would be if there are two roads that
intersect. The roads can be parallel, perpendicular or at any angle to one
another but you can not have an angle between just one road. This is similar
to phase. - answer-Phase is a relational radio concept in that it compares two
waves to each other as either in phase or out of phase.
Attenuation occurs in free space and as signals travel through materials such
as walls and doors. The attenuation is the weakening of the signal as it
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