Top 5 Tech Support questions on Cisco System's products - Weekly Update Nov 1st

The most actively discussed Tech Support questions on the web for Cisco System's products (Week of Nov 1st 2010)

1. Can we set up a BGP if there is only one connection leaving the network?
2. How to enable MAC address filtering?
3. How can we get the serial port information for an H.323 call into the call record?
4. Clockrate, DTE/DCE -Why are we unable to remove clock rate?
5. What are the rules that OSPF uses to select the best path.