Describe VPN technology (including importance, benefits, role, impact, components), CCNA Coaching Center in Gurgaon

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I’d be pretty willing to bet you’ve heard the term VPN more than once before. Maybe you even
know what one is, but just in case, a virtual private network (VPN) allows the creation of
private networks across the Internet, enabling privacy and tunneling of non-TCP/IP protocols.
VPNs are used daily to give remote users and disjointed networks connectivity over a public
medium like the Internet instead of using more expensive permanent means.
Types of VPNs are named based upon the role they play in a business. There are three
different categories of VPNs:
Remote access VPNs Remote access VPNs allow remote users like telecommuters to
securely access the corporate network wherever and whenever they need to.
Site-to-site VPNs Site-to-site VPNs, or, intranet VPNs, allow a company to connect its
remote sites to the corporate backbone securely over a public medium like the Internet instead
of requiring more expensive WAN connections like Frame Relay.
Extranet VPNs Extranet VPNs allow an organization’s suppliers, partners, and customers
to be connected to the corporate network in a limited way for business-to-business (B2B) communications.
Now you’re interested, huh! And since VPNs are inexpensive and secure, I’m guessing
you’re really jonesing to find out how VPNs are created, right? Well, there’s more than one
way to bring a VPN into being. The first approach uses IPSec to create authentication and
encryption services between endpoints on an IP network. The second way is via tunneling protocols,
allowing you to establish a tunnel between endpoints on a network. And understand
that the tunnel itself is a means for data or protocols to be encapsulated inside another protocol—
pretty clean!
I’m going to go over the first, IPSec way in a minute, but first, I really want to describe four
of the most common tunneling protocols in use:
Layer 2 Forwarding (L2F) Layer 2 Forwarding (L2F) is a Cisco-proprietary tunneling protocol,
and it was their first tunneling protocol created for virtual private dial-up networks (VPDNs).
VPDN allows a device to use a dial-up connection to create a secure connection to a corporate network.
L2F was later replaced by L2TP, which is backward compatible with L2F.
Point-to-Point Tunneling Protocol (PPTP) Point-to-Point Tunneling Protocol (PPTP)
was created by Microsoft to allow the secure transfer of data from remote networks to the
corporate network.
Layer 2 Tunneling Protocol (L2TP) Layer 2 Tunneling Protocol (L2TP) was created by
Cisco and Microsoft to replace L2F and PPTP. L2TP merged the capabilities of both L2F and
PPTP into one tunneling protocol.
8.5 Configure and verify a PPP connection between Cisco routers 371
Generic Routing Encapsulation (GRE) Generic Routing Encapsulation (GRE) is another
Cisco-proprietary tunneling protocol. It forms virtual point-to-point links, allowing for a variety
of protocols to be encapsulated in IP tunnels.
Exam Objectives
Understand the term virtual private network (VPN). A virtual private network (VPN) allows
the creation of private networks across the Internet, enabling privacy and tunneling of non-TCP/
IP protocols. VPNs are used daily to give remote users and disjointed networks connectivity over
a public medium like the Internet instead of using more expensive permanent means.
Remember the three categories of VPN’s. Types of VPNs are named based upon the role
they play in a business. There are three different categories of VPNs: remote access VPNs, siteto-
site VPNs and extranet VPNs