cisco ccna flash cards

cisco ccna flash cards.There are many VPN technologies, such as IPSec. point-to-point tunneling protocol (PPTP), layer 2 transport protocol (L2TP), SSL, and others, but this chapter only briefly covers VPNs. for an in-depth look at VPNs: the different types of VPNs and the technologies they use, how they work, configuration, and troubleshooting, see The Complete Cisco VPN Configuration Guide (CiscoPress, 2005) book.24.4.1 AdvantagesVPNs have four major advantages over building private WAN networks such as those used by Frame Relay, point-to-point circuits, and ATMs. . Security: data encryption ensures confidentiality, data integrity checking verifies packets, and authentication prohibits unauthorized access; together, these features provide security.. Cost: The ability to use public networks such as the Internet without the need to build a private WAN infrastructure implementation significantly reduces the cost of WAN infrastructure.. Bandwidth: Inexpensive, high-speed connections such as DSL and cable networks can be used to connect branch offices, giving them fast and secure access to corporate resources.. Scalability: Add large numbers of users and branch offices without building a WAN infrastructure.Be sure to familiarize yourself with the benefits of VPN solutions.2442 Types of VPNsThere are two types of VPNs.Chapter 24 Introduction to the WAN 661