Mixed 11b/11g WLAN Performance
1. In your opinion, what is the purpose of our dropping the transmit power to such a low level?
2. What do access point connectivity statistics collected for the roaming station show?
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?
4. How much did our roaming node reduce the total throughput in our heavily loaded WLAN?
5. What caused this reduction in "goodput" on the 11g WLAN?
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?
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.
8. What is the "protection" scheme talked about in the standard? In short, how do 11g nodes know that an 11b node is associating and how is CCK involved?
9. In addition to the added overhead of the RTS/CTS scheme, what else causes the drop in throughput you see? Are there other factors that can affect the throughput?
10. In situations where 802.11g and 802.11b are coexisting, what steps might you take to minimize the impact of the presence of the legacy nodes?
Attachment:- WLAN Performance.docx