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    Ebook Syngress Configuring SonicWALL Firewalls(2006)

    By admin | May 30, 2014

    Tagged with:

    image

    Chris Lathem (CSSA, Network+) is currently working
    as a Network Engineer for Consultrix Technologies.
    Consultrix, based in Ridgeland,MI, specializes in net-
    work management and security services, structured
    cabling, and application development. Prior to joining
    Consultrix, Chris was a Security/Network Engineer for
    NSight Technologies, now based in Tampa, FL.While at
    Nsight, Chris specialized in the support and configura-
    tion of firewall appliances from multiple vendors, as well as network
    design and architecture.While working for NSight, Chris gained
    extensive knowledge of SonicWALL firewall appliances and
    achieved certification as a Certified SonicWALL Security
    Administrator. It was during his tenure at Nsight that Chris first
    worked with Syngress Publishing as a contributing author to the
    book Configuring NetScreen Firewalls. Before joining Nsight, Chris
    held the position of Network Engineer for SkyHawke Technologies,
    a technology start-up company in the recreational GPS industry,
    where he spent a great deal of time configuring NetScreen security
    appliances. Chris currently resides in Sebastopol,MI, with his wife,
    Susann, and son Miller.

    Introduction
    Every enterprise requires at least one firewall to provide the backbone for its net-
    work security architecture. Firewalls are the core component of your network’s secu-
    rity.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 develop-
    ment 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 technolo-
    gies to inspect your network’s traffic.This technology is not something that is exclu-
    sive 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 sec-
    tion,“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.
    We will next look at networking in general by breaking it down to a layered
    approach.This will help you understand the flow of networking. Each specific layer
    in the networking model has a purpose.Working together, these layers allow for data
    to seamlessly pass over the network between systems.An example of browsing a Web
    site will be used.You will see all of the effort it takes just to fetch a Web page.We
    will focus then on the TCP/IP protocol suite.This is the most commonly used net-
    working protocol and it is the protocol of the Internet. Finally in this chapter, we
    will look at network security.There are many important concepts to be aware of for
    information security.This will help you understand some network design considera-
    tions and the background behind them.

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