Some services are considered Layer 2 connections
between your remote locations, typically provided by a telephone company (telco) over its
WAN switches. Some of these technologies include a serial point-to-point (leased line)
connection and Frame Relay connections.
Other connections leverage the Internet infrastructure, a Layer 3 alternative, to interconnect
the remote locations of an organization. To provide security across the public Internet, you
can implement a virtual private network (VPN) solution.
This chapter introduces the components of a VPN solution for WAN connectivity, explains
how to con?¬?gure a PPP connection, and describes Frame Relay operation, con?¬?guration,
and troubleshooting.
Chapter Objectives
Upon completing this chapter, you will be able to identify and implement the appropriate
WAN technology based on network requirements. This ability includes being able to meet
these objectives:
?– Describe the uses of VPNs for site-to-site and remote-user access
?– Connect to a service provider over a network and describe the operation and
con?¬?guration of PPP
?– Connect to a service provider over a network and describe the operation and the basic
con?¬?guration of Frame Relay
?– Identify an approach for troubleshooting common Frame Relay problems and offer
solutions
298 Chapter 8: Extending the Network into the WAN
Introducing VPN Solutions
Cisco VPN solutions provide an Internet-based WAN infrastructure for connecting branch
of?¬?ces, home of?¬?ces, business partner sites, and remote telecommuters to all or portions of
a company network.
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