31 Days Before Your CCENT Certification

CCNA Discovery 2, Chapter 1

1.2.2: Often the Internet is represented in a diagram as a cloud. This cloud represents the hierarchy of devices that connect you to other networks and the Internet. ISPs sit at the top of this hierarchy and connect to each other through Internet exchange points (IXP) or network access points (NAP). These IXPs and NAPs between ISPs provide the backbone for the Internet. If you want to use the cheesiest term available, refer to these connections as the “information superhighway.” This Internet backbone is typically connected with fiber-optic cable installed underground and even undersea. The connections between continents are handled by tier 1 ISPs. The intermediary connections between countries are classified as tier ...