A:
here is the info in their FAQ:
Will my Xbox work with the Actiontec Modem or Router?
Yes, Actiontec Modems and Routers are compatible with the Xbox. However, it may be necessary to forward the ports used by the Xbox, in the Actiontec Modem or Router. Without Port Forwarding, the Xbox Connection Test may report a "NAT" rating of "STRICT" or "MODERATE", rather than "OPEN".