cisco ccna expired

cisco ccna expired.Chapter 24 Introduction to the WAN 659endo Check the configuration of the router again: show running-configo Check the status of the interfaces: show interfaces serialO, and notice that the data link layer status is still down, which indicates that there must be a problem with router 2600-2.4. Go to router 2600-2 and find the PPP problem there. Click on the Lab Instructions tab and select 2600-2 from the drop-down list Devices; you can also click on the NetMap tab and double-click on the device icon 2600-2o view the active configuration: show ninning-config, notice that the command username is correct, where the hostname and password are However, there is a problem with the PPP authentication configuration of the serial interface, where CHAP is not configured. fix this: configure terminal, interface serialO and ppp authentication chapo disable and re-enable the interface: shutdownx no Wait a few seconds and check the status of the interface: show interfaces serialO, the data link layer should now be active and the line protocol status is upo5. Check the connectivity between routers 2600-2 and 2600.1. Check the connectivity to router 2600-1: ping 192.168.2.1, this should be successful. To be able to connect to all devices, you need to add static routes to 192.168.1.0/24 and 192.168.3.0/24 on routers 2600-2 and 2600.1 respectively.You should now be able to configure PPPTo more comfortably on the routerAuthentication Target 24.0424.4 Virtual Private NetworksAn increasingly popular WAN solution is the Virtual Private Network (VPN). The term "network" in virtual private network refers to a public network, such as the Internet, and "virtual" refers to hiding the public network from internal networks, such as users and services. This is similar to using virtual circuits (VCs) to connect to remote sites, such as corporate headquarters, remote access users and SOHOs, branch and regional offices, and business partners, as shown in Figure 24.7. In practice, VPNs are similar to Frame Relay networks, but VPNs use a public network to achieve connectivity, whereas Frame Relay uses a private network. The term "private" in virtual private network refers to the fact that traffic is private and not visible to eavesdroppers, which is achieved by using encryption to ensure data confidentiality.Intranet: different sites of the same company Extranet: third parties and business partners Remote access: users and SOHOsFigure 24.7 Networks using VPNs