SECTION A: Networks can be classified by geo graphical scope as PANS, . and WANs. The cables and signals used to transport data from one network device to another are a communication J. Wired channels include twisted pair wires, cables used for cable television, and -optic cables used for high-capacity trunk lines. Wireless channels use sig- nals and microwaves. Government agencies regulate some wireless 1. The transmission capac- ity of a channel is referred to as Channels that are capable of moving at least 25 Mbps are classified as J. Networks can be con- figured in various , such as star, mesh, point-to-point, or bus. Any device in a network is referred to as a(n) 2. Data equipment includes computers. Data equipment includes modems and routers. Additional DCEs include hubs, switches, bridges, repeaters, and Jaccess points. Networks use physical, transport, and arrival communication to set the rules for efficiently transmitting data and handling errors. SECTION B: The Internet is based on a U.S. govern- addresses are 32 bits long, whereas . Today, the addresses are 128 bits long, providing billions and bil- Internet is a collection of networks, tied together by com- lions of possible addresses. Addresses are assigned by mon . Tier 1 networks form the servers. IP addresses that are tempo- Internet J. a system of high-capacity rarily assigned are called addresses, routers and fiber-optic communication links arranged in a(n) whereas permanent ones are called topology. Networks that form the addresses. IP addresses cannot be Internet are maintained by L that routed over the Internet and are usually assigned to devices offer access to consumers. Before data travels over the within LANs. Because it is difficult to remember IP addresses, Internet, it is divided into name system allocates easy-to- tocol called J. which also reassem- remember names, such as nike.com. bles the data when it reaches its destination. Every device -level domains include .com and .edu. The servers that track on the Internet uses an IP address. these names are a vulnerable point in Internet security