ccna 200 301 book amazon

ccna 200 301 book amazon.15.2.2 Public WAN and Internet AccessTo build the Internet, Internet service providers (ISPs) need to have links to other ISPs and other ISP users. The Internet kernel uses a variety of high-speed technologies to connect ISPs, and the Internet access links again use a variety of technologies to connect ISPs to each customer. For these customer access links, the technology must be inexpensive so that the average customer can afford to pay for the service.Some WAN technologies, as well as Internet access technologies, may work very well. In fact, some technologies use the same phone line installed in the home through the phone company, so that the ISP does not need to install additional cable. Other technologies use cable TV cables, while others use wireless signals.This section will briefly describe several WAN technologies and how they access the Internet. This section concludes with a discussion of the configuration of a related protocol configuration called PPP over Ethernet (PPPoE).Internet Access (WAN) LinksEach WAN technology may be used to build both public and private WANs; some happen to be better suited for one or the other. However, for the sake of completeness, note that all of the WAN technologies discussed in the first half of this chapter are suitable as Internet access technologies, especially for the enterprise. Enterprises typically use TDM serial links, Frame Relay, Ethernet WAN services, and even MPLS services to access the Internet.Figure 15-6 is part of this, and is used here as a visual marker for these options.Figure 15-6 Three Examples of Enterprise Internet Access Links317 Chapter 15 Identifying Other WAN Types11.2 Basic Content 318