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VPN stands for Virtual Private Network. Its job is to ensure the secure delivery of data over public networks. By doing this, users can send data as if they were connected directly to the private network.

Private WAN technology is available, but it comes at a price. However, Internet VPNs only require a very affordable Internet connection.

A VPN is often described as a tunnel. Your data is encrypted before it travels over the public Internet. If one of the bad guys gets their hands on your data this way, they won't be able to make any sense of it. Once your data is received, it is then decrypted with a special key so that it can be read.

There are two main types of VPN.

A site-to-site VPN connects two or more sites together. It must be configured on both networks, so it is ideal in situations where you have multiple remote locations.

But you may also have individual users who work from home, in a coffee shop or anywhere else in the world. These users still need access to the corporate network, but a site-to-site VPN won't work because you have no control over the networks they connect to.

Instead, they can use a VPN for remote access. A remote access VPN provides access to the corporate network, but only to one device, such as a user's laptop at a coffee shop. This is different from the site-to-site VPNs that connect two entire networks.

When configuring VPNs for remote access, you must decide whether you want to use a "full tunnel" or a "split tunnel." A full tunnel means that once connected to the VPN, all network traffic from this host is forwarded to the corporate network. A split tunnel means that only traffic destined for the main office is sent through the VPN. All other traffic will be routed normally.

IPSec is a framework or set of rules for creating VPNs over a network.
It does not define one way to create a VPN, but allows multiple protocols to be used for each VPN function. IPSec is often used for site-to-site VPNs, but can also be used for remote access.

#ccna #cisco #networking

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