It also places your communications at the mercy of overall network activity, and throughput can fail from time to time. There's also the issue of security. Obviously, more users and more points of entry mean a greater risk of intrusion, and the Internet has millions of users. The answer is to configure your routers to filter out unwanted packets, preventing sensitive parts of your network from carrying traffic for the rest of the Internet. Use encryption when moving important data over the public backbone.
Dedicated lines can be very expensive, depending on the data rate.
When you factor in one-time equipment and installation charges, the price can range in the thousands of dollars. Keep in mind, however, that this is for 24-hour access and that the competitive markets make many rates negotiable. The Internet's Domain Name System provides a logical method of naming computers on the network. There are only a few left. Class B supports 65,534 computers and Class C is for connecting networks with fewer than 254 computers.