With the CLIP, (as mentioned before), inter-LIS communications have to go through routers. This is not an optimal solution when both nodes communicate with each other are attached to the same ATM network. A mechanism is needed for an end system to resolve the IP address of another end system in a foreign LIS into the corresponding ATM address. The NBMA (Non Broadcast, Multi Access) NHRP protocol, developed by the IETF, overcomes this limitation and provides this mechanism.
One of firefox features is that when typing a partial URL into the URL field (URL or location bar), Firefox will automatically contact Google's search engine to find and provide search answers. This work fine till one of your computer users download the Yahoo search add-ons, which makes Yahoo Search! default Firefox search without being aware or alerted about that. So if we have the Yahoo add-on and we will type a key word (or partial Web address), we will not go straight to the Google search but instead we will see Yahoo Search results.