(Virtual Private Network) A private network that
is configured within a public network (a carrier's
network or the Internet) in order to take advantage
of the economies of scale and management facilities
of large networks. VPNs are widely used by
enterprises to create wide area networks (WANs) that
span large geographic areas, to provide site-to-site
connections to branch offices and to allow mobile
users to dial up their company LANs.
- VPN over
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MPLS is a development by the Internet community.
It seeks to combine the flexibility of the IP
network layer with the benefits provided by a
connection-oriented approach to networking.
MPLS is a Multi protocol label-switched network
solution using the principle of separating control
from data transfer. This architecture enables MPLS
to use a range of different forwarding methods
system that can carry multiple network layer
protocols. MPLS sends information over a wide area
network (WAN) in frames or packets. Each
frame/packet is labeled and the network uses the
label to decide the destination of the frame. In an
MPLS network we can define explicit paths or let IP
routing decide the path.