1. Vocabulary URL = uniform resource locator: web address protocol –set of rules that networked computers follow in order to share data and coordinate communications TCP/IP –protocols used for the Internet –TCP – transmission control protocol: packet breakup & reassembly –IP – Internet protocol: shipping DNS –Domain Name Service packet –part of a message router –computer responsible for directing the network’s traffic 12

2. The Internet - How it works MESSAGE 123 456 1 4 3 56 2 123.123.123.123 111.222.111.222 MESSAGE 13

3. Routing 14