Billion Electric Company BiGuard 50G - Manual (Page 170)

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D.3.2 Why Use a Firewall?
With a LAN connected to the Internet through a router, there is a chance for hackers
to access or disrupt your network. A simple NAT router provides a basic level of
protection by shielding your network from the outside Internet. Still, there are ways
for more dedicated hackers to either obtain information about your network or
disrupt your network’s Internet access. Your BiGuard 50G provides an extra level of
protection from such attacks with its built-in firewall.