MAC Address
A unique identifier code given by the NIC (network interface card) to communicate on a physical network.
The standard format for printing mac addresses is six groups of two hexadecimal numbers usually followed by hyphens or colons.
List any sites, books, or sources utilized when researching information on this topic. (Remove any filler text).
Wikipedia
Datagrams
A packet delivery system comparable to the Mail system. It is given an address and it has no guarantee of it's delivery.
List any sites, books, or sources utilized when researching information on this topic. (Remove any filler text).
A simple example of VoIP would be Google Voice. Using sipgate with Google Voice, you are able to make free VoIP calls.
This is not easy to demonstrate… hmm http://lifehacker.com/5349506/make-free-voip-calls-from-google-voice uhmmm