es that sell toll- plexer does, an inverse multiplexer separates free 800, international, data networking, and out channels into smaller "chunks." Inverse outgoing telephone service on an interstate multiplexers are used for video conferencing, basis. They now also sell local telecommuni- where the 24 channels might be transmit- cations services. ted in groups of six channels at a speed of 386Mbps. A programming language created by Sun IPv4 (Internet Protocol version 4) Microsystems. Multiple types of comput- An older addressing format for networks. ers can read Java programs. They increase Each device on an Internet network is the power of the Internet because programs assigned a 32-bit IP address. This limits the written in Java (called applets) can be down- total number of addresses available. loaded temporarily by client computers. They do not take up permanent space on the cli- IPv6 (Internet Protocol version 6) ent hard drive. Interactive games can use Java A newer Internet protocol format that speci- fies 32-bit IP addresses. This increases the programs. number of addresses available in networks LAN (Local Area Network) and on the Internet. IPv6 also has additional Enables computer devices such as personal security. computers, printers, alarm systems, and scanners to communicate with one another. IPsec (Internet Protocol Security) A protocol that establishes a secure, encrypted Moreover, LANs allow multiple devices to link to a security device at the carrier or the share and have access to expensive peripher- enterprise. It is used for remote access to cor- als such as printers, firewalls, and centralized porate services (such as e-mail) in conjunc- databases. A LAN is located on an individual tion with VPNs. organization's premises. ISDN (Integrated Services Digital LATA (Local Access Transport Area) Network) Upon divestiture in 1984, LATAs were set up A digital network standard that lets users send as the areas in which Bell telephone compa- voice, data, and video over one telephone line nies were allowe