A technician installed two ground plane antennae on 802.11n bridges connecting two buildings
500 feet apart. After configuring both radios to work at 2.4ghz and implementing the correct
configuration, connectivity tests between the two buildings are unsuccessful. Which of the
following should the technician do to resolve the connectivity problem?
A.
Substitute wireless bridges for wireless access points
B.
Replace the 802.11n bridges with 802.11ac bridges
C.
Configure both bridges to use 5GHz instead of 2.4GHz
D.
Replace the current antennae with Yagi antennae
And here for a definition: A bridge is a really useful bit of equipment used to connect two wireless networks together to create one big network. This allows the range of your network to be significantly extended without any of the signal problems you likely get if you simply used a wifi repeater.
The key issue in here is the fact that the buildings are “500 feet apart”.
The maximum range of each standard varies, depending on environmental factors such as obstructions and interference from other sources of radio frequency signals.
** The maximum range of 802.11a wireless was approximately 95 feet with throughput of up to 54 megabits per second, while 802.11b was capable of transmitting up to 150 feet at 11 Mbps.
** The 802.11g standard extended that range to 170 feet at the same speed as 802.11a; 802.11n extended the maximum range to 230 feet and throughput to a maximum of 600 Mbps. 802.11ac routers provide similar range but increase throughput to a theoretical maximum of 1.33 gigabits per second.
So whichever way we look at it, the problem in here is with the range= The distance between the bridges is too far.
Also, WiFi is always promoted using ‘theoretical’ speeds and by this standard 802.11ac is capable of 1300 megabits per second (Mbps) which is the equivalent of 162.5 megabytes per second (MBps). This is 3x faster than the typical 450Mbps speed attributed to 802.11n.
Process of elimination:
A. Substitute wireless bridges for wireless access points.
— This would only make the matters worse, as the range of an access point is even less than that of a bridge
B. Replace the 802.11n bridges with 802.11ac bridges:
This would increase speeds, but it will not make any difference as one bridge still won’t be able to talk to the other due to the distance in question
C. Configure both bridges to use 5GHz instead of 2.4GHz
Same. This would increase speeds, but it will not make any difference as one bridge still won’t be able to talk to the other due to the distance in question.
So the best answer, and the only one which successful deals with the problem of range/distance is the use of an antenna.
So this is D. Replace the current antennae with Yagi antennae
In many cases a Yagi may cover up to 3 or more miles.
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