Unit 6: Assignment
PLEASE NOTE: I got 9/10 points. You can console his comment at the bottom.
6-1. A building is cube-shaped. It uses 16 access points, which are, on average, 10 meters
apart from one another. The comp
...
Unit 6: Assignment
PLEASE NOTE: I got 9/10 points. You can console his comment at the bottom.
6-1. A building is cube-shaped. It uses 16 access points, which are, on average, 10 meters
apart from one another. The company wishes to reduced this to 8 meters. About how many 5
GHz access points would the company need for the building?
6-2. The following matters were not addressed specifically in the text. However, if you understand the concepts of Layer 1 and Layer 2 standards, in each case, give your answer
and explain your reasoning. a) Is multipath inter-ference a Layer 1 or Layer 2 concern? b)
Is media access control a Layer 1 or Layer 2 con-cern? c) Is MIMO a Layer 1 or Layer 2
concern? d) Are wireless propagation problems Layer 1 or Layer 2 concerns? e) Is 802.11ac a
Layer 1 or Layer 2 standard? f) Is 802.11r a Layer 1 or Layer 2 standard?
ANSWERS:
6-1. The Company needs 25 GHz access points for the building.
6-2
a) Multipath interference is a Layer 1 concern because "one signal may be at its
highest amplitude while the other is at its lowest, giving an average of zero. If their
amplitudes are the same, they will completely cancel out" and Layer 1 is a physical
layer that works with electrical impulse, light or radio signal.
b) Media access control is a Layer 2 concern because it controls how a computer on
the network gains access to the data and permission to transmit it.
c) MIMO is a Layer 1 concern. I figure this answer as I read the benefits of MIMO in
the textbook which says "Another benefit of MIMO, beyond greater transmission
speed, is greater transmission range. Greater propagation distances may permit
fewer access points to be installed, and this will lower equipment and installation
cost."
d) Wireless propagation problems are Layer 1 concerns because all the wireless
propagation problems related to wireless troubles such as "a radio signal travels, it
is partially absorbed by the air molecules, plants, and other things it passes
through" or "if there is a dense object blocking the direct path between the sender
and the receiver, the receiver may be in a dead zone"; and Layer 1 works
with electrical impulse, light or radio si
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