8.3 Virtual Private Networks (VPNs) Flashcards
Provides the equivalent of a private packet-switched network over the Internet
Virtual Private Networks
Involves establishing a series of PVCs that run over the Internet
Virtual Private Networks
Established PVCs act like a set of dedicated circuits even though the data flows over the Internet (public domain)
Virtual Private Networks
With a VPN, you first _________ an Internet connection at whatever access rate and access technology you choose for each location you want to connect
lease
You connect a ___________________ (a specially designed router) to each Internet access circuit to provide access from your networks to the VPN
VPN gateway
The VPN gateways enable you to create PVCs through the Internet that are called ___________
tunnels
The VPN gateway at the sender takes the outgoing packet and encapsulates it with a ___________ that is used to move it through the tunnel to the VPN gateway on the other side
protocol
The VPN is ___________ to the users — it appears as though a traditional packet-switched network PVC is in use
transparent
________________ is commonly used on home computers, laptops, or mobile devices to provide the same secure tunnels to people working from offsite
VPN software
VPNs operate at either ___________ or layer 3
layer 2
______________________ (L2TP) is an example of layer 2 VPN
Layer 2 tunneling protocol
A _______________ uses the layer 3 packet (e.g., IP) to select the VPN tunnel and encapsulates the entire packet.
layer 3 VPN
___________ is an example of layer 3 VPN
IPSec
VPN’s primary advantages are ___________ and ___________
low cost… flexibility
VPN’s two disadvantages:
- Traffic on the Internet is unpredictable
- Because the data travel on the Internet, security is always a concern
Most VPNs ___________ the packet at the source device before it enters the Internet and decrypt the packet at the destination VPN device
encrypt
Three VPN types:
- Intranet VPN
- Extranet VPN
- Access VPN
An ___________ VPN provides virtual circuits between organization offices over the Internet
intranet
An ___________ VPN is the same as an intranet VPN, except that the VPN connects several different organizations, often customers and suppliers, over the Internet
extranet
An ___________ VPN enables employees to access an organization’s networks from a remote location
access
