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Forum di prova - Joomla is an open source and free [url=http://www.team49ersj

zhangsan - Lun Ago 19, 08:34:22
Oggetto: Joomla is an open source and free [url=http://www.team49ersj
Joomla is an open source and free
, award winning content management system or also called CMS. It is used for publishing content in the Internet and uses a model-view-controller or MVC Web application framework which can be utilized separately. Joomla makes use of object-oriented programming or OOP software design techniques and patterns. It has elements like page caching, support for language internationalization, RSS feeds, and printable versions of pages, news flashes, polls and blogs. Joomla is written in PHP and stores data in MySQL database.


Joomla had been downloaded about 2.5 million times, by the end of its first year on-line. There are more than 6000 free and commercial plug-ins available from the official Joomla Extension Directory and many others offered from different sources.


Mambo initially developed Joomla in August 2005, which at the time, Mambo was trademarked by Miro International Pvt Ltd. They developed a foundation which was non-profit with the objective to fund the project and keep it protected from lawsuits. The Joomla development team claimed that many provisions of the foundation structure went against previous agreements made by the Mambo Steering Committee which was elected. They also felt there were provisions involved that violated core open source values as well as lacked the essential consultation with key stake-holders.

Question: 1

What word describes the bending of an RF signal as it passes through a medium of a varying density from that of free space?


A. Diffraction
B. Reflection
C. Refraction
D. Diffusion
E. Scattering


Answer: C


Question: 2

What can cause an excessively high VSWR (Voltage Standing Wave Ratio) in a WLAN RF transmission line?


A. An impedance mismatch inthe RF cables and connectors
B. Reflected direct current (DC) voltage on the main RF signal line
C. Attenuation of the RF signal as it travels along the main signal path
D. Crosstalk (inductance) between adjacent RF conductors


Answer: A


Question: 3

What factors influence the distance that an RF signal can be effectively received? (Choose 3)


A. Transmitting station鈥檚 power source
B. Receiving station鈥檚 radio sensitivity
C. Free Space Path Loss
D. MAC layer encryption
E. Transmitting station鈥檚output power
F. Temperature in the Fresnel zone


Answer: B, C, E


Question: 4

As an RF wave propagates through space, the wave front experiences natural expansion that reduces its signal strength in an are
a. What term describes the rate at which this expansion happens?
A. MU-MIMO
B. Inverse square law
C. Fresnel zone thinning
D. Ohm鈥檚 law


Answer: B


Question: 5

Return Loss is the decrease of forward energy in a system when some of the power is being reflected back toward the transmitter.
What will cause high return loss in an RF transmission system, including the radio, cables, connectors and antenna?


A. A Voltage Standing Wave Ratio (VSWR) of 1:1
B. An impedance mismatch between components in the RF system
C. The use of cables longer than onemeter in the RF system
D. High output power at the transmitter and use of a low-gain antenna


Answer: B


Question: 6

What factors are taken into account when calculating the Link Budget of a point-to-point outdoor WLAN bridge link?


A. Operating frequency
B. Transmit antenna gain
C. Transmit power
D. Antenna height


Answer: A, B, C


Question: 7

A WLAN transmitter that emits a 200 mW signal is connected to a cable with 3 dB loss.
If the cable is connected to an antenna with 10 dBi gain, what is the EIRP at the antenna element?


A. 10 dBm
B. 13 dBm
C. 20 dBm
D. 26 dBm
E. 30 dBm


Answer: E


Question: 8

In a long-distance RF link, what statement about Fade Margin is true?


A. Fade Margin is an additional pad of signal strength designed into theRF system to compensate for unpredictable signal fading.
B. The Fade Margin of a long-distance radio link should be equivalent to the receiver鈥檚 antenna gain.
C. A Fade Margin is unnecessary on a long-distance RF link if more than 80% of the first Fresnelzone is clear of obstructions.
D. The Fade Margin is a measurement of signal loss through free space, and is a function of frequency and distance.


Answer: A


Question: 9

Which unit of measurement is an absolute unit that is used to quantify power levels on a linear scale?


A. dBm
B. SNR
C. RSSI
D. VSWR


Answer: A


Question: 10

An 802.11 WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB of loss. The cable is connected to an antenna with 16 dBi of gain.
What is the EIRP power output?


A. 2 mW
B. 500 mW
C. 250 mW
D. 1000 mW


Answer: D

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