Mis 589 Homework Questions Week 5

Topics: IEEE 802.11, Omnidirectional antenna, Directional antenna Pages: 3 (858 words) Published: February 24, 2013
3. Compare and contrast the two types of antennas.
There are mainly two types of antennas: omnidirectional, and directional. Omnidirectional antennas are installed on most WLANS with AP’s that have them. Omnidirectional antennas do just what they sound like, which is transmit data in all directions at the same time. The signal can go horizontally and vertically; and up and down. However, there can be a dead spot in a minute area directly above the antenna which has no signal. One common example of this type of antenna is the dipole antenna. It is referred to often as the rubber duck, because it is highly flexible. (Fitzgerald, 233) Directional antennas can also be used on AP’s. Directional antennas project a signal in only one direction. This is a good thing. It is good, because the signal is narrower and more focused in a certain area and can carry a farther distance than an omnidirectional antenna would. These would best inside a building, propped on an exterior wall pointing to the inside of a building. If you want the signal to stay inside and keep security tight, this is a better choice. Putting the directional antenna this way will also help to increase the AP’s range. (Fitzgerald, 233).

7. How does 802.11g differ from 802.11b and 802.11a?

802.11g’s provide high speed wireless networking in the 2.4 GHz range. They have few channels(three which can be used indoors in the US) and can provide more elsewhere on a global scale, due to varying radio frequency spectrum regulations. This standard was designed to kind of be a replacement of both 802.11 a and b, by taking the best of both of these standards and combining them. 802.11g id designed in such a way that it can be backwards compatible with 802.11b, making it easier for business operating on the former access point who do not want to get rid of their network cards. Speed can be a factor when the two are close together. Managers must remember that with 802.11 g, “Each channel...
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