Week 3 iLab Report
NETW360: Wireless Technologies and Services
MIXED 11B/11G WLAN PERFORMANCE
Date: January 25, 2015
Mixed 11b/11g WLAN Performance
Specific questions from iLab
1. In your opinion, what is the purpose of our dropping the transmit power to such a low level?
The purpose, in my opinion, is to make a small scale test network
2. What do access point connectivity statistics collected for the roaming station show?
They show that the data remains the same. The access point connectivity statistics were constant for the duration of the 30 second simulation
3. What do you think the Wireless LAN control traffic received by the roaming 11b node when it is in the engineering building is composed of?
It is composed of random outcomes for the size of generated packets (bytes)
4. How much did our roaming node reduce the total throughput in our heavily loaded WLAN?
At the beginning of the simulation, throughput was at 25,500,000 bits per second. 13 seconds in, about when roaming node entered the engineering building, throughput was reduced to 21,600,000 bits per second, which is a loss of 3,900,000 bits per second. Then as the roaming node left (aprox 18 seconds) throughput went back up again to 25,500,000 bits per second
5. What caused this reduction in “goodput” on the 11g WLAN?
The reduction in goodput was most likely caused by the interference of the roaming node
General questions concerning mixing 11b and 11g clients
6. Supposedly, 802.11b is “backwards compatible” with 802.11g, yet this lab demonstrates there are significant problems with allowing the two to coexist. What is the primary “incompatibility” between b and g?
Any appliances in the area can interfere on the unregulated signal frequency
7. There is another mechanism besides RTS/CTS that helps the incompatibility. Explain briefly the difference between RTS/CTS and CTS-to-self and when each is used....