ccna 200 301 book release date

ccna 200 301 book release date.Figure 15-12 PPP frames between routers on an ISP dial-up connectionThere are two reasons why ISPs use PPP as a data link protocol. First, PPP supports a method for assigning IP addresses to the other end of the PPP link. ISPs can use PPP to assign an available public IPv4 address to each user. But the more important thing to discuss is that PPP supports CHAP, and ISPs may want to use CHAP to authenticate customers. In addition, when using CHAP for authentication, the ISP checks the account history to see if the customer has paid their bill before allowing them to connect to the Internet.Now, take a moment to review the history of some Internet access technologies. The following technologies are listed in order and support PPP to varying degrees.(1) The use ofPPP and CHAP for dial-up analog modems.(2) Use thePPP and CHAP for dial-up ISDN.-3DSLs that do not create a point-to-point link and do not support PPP and CHAP. then phone companies and ISPs like DSLs, while other ISPs still want their PPP ! However, customers often use a client PC or roadEthernet link between the router and the DSL modem (see Figure 15-9) o Ethernet supports only the Ethernet Data Link Protocol, not PPP. All the ISP needs is to establish a method of connection between the user router and the ISP router that is equivalent to PPP and that uses a different