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Configuring Sonicwall Firewalls

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Every enterprise requires at least one firewall to provide the backbone for its network
security architecture. Firewalls are the core component of your network’s security.
The risks today have greatly increased, so the call for a stronger breed of firewall
has been made. In the past, simple packet-filtering firewalls allowing access to your
internal resources have helped to mitigate your network’s risk.The next development
was stateful inspection allowing you to monitor network sessions instead of
single packets.Today’s risks are far greater and require a new generation of devices to
help secure our networks’ borders from the more sophisticated attacks.

Firewalls police your network traffic. A firewall is a specialized device that allows
or denies traffic based upon administratively defined policies.They contain technologies
to inspect your network’s traffic.This technology is not something that is exclusive
to firewalls, but firewalls are designed specifically for inspecting traffic and
therefore do it better then any other type of device.Any network can have millions
of packets transverse it in a short period of time. It is impossible for a human to
directly interact with the network. Even if you were to use a tool to look at the
traffic directly it would be impossible for you to decide which traffic is good and
which is bad.The need for a specialized device to enforce traffic restrictions has
grown over the years. Because security is of such high importance, a specialized
device was required to ensure the security of network traffic.

SonicWALL firewall appliances have answered this call for a secure enterprise.
The SonicWALL firewall product line has complete offerings from the home office
to the enterprise networks. In this chapter we will review networking basics.
Security requires a strong basic knowledge of networking protocols. In our first section,“
Understanding Networking,” we will look at networking from a top-down
approach.This section starts with the basic ideas of networking models and then
works into full networking communications.We will also discuss the components
and prerequisites of IP addresses and how they are divided up to make networks.
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