Unit 6 ASSIGMENT ANSWERS COMPUTER 337

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