Firewalls work

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  • Note With the implementation of the PIX and ASA software starting with version 7.0, many of the features and functionality of the firewall were changed dramatically.

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  • Most Linksys routers/firewalls rely on simple NAT routing and basic port filtering to control the flow of traffic through the router.

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  • Many broadband routers and firewalls function primarily through the use of Network Address Translation (NAT) to hide the internal systems behind a single external IP address.

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  • What Is a Firewall? When most people think of a firewall, they think of a device that resides on the network and controls the traffic that passes between network segments

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  • Welcome to Firewalls For Dummies, a book written to help the average Joe understand how firewalls work and how to configure a firewall. This book meets the needs of the person just finding out about computers, as well as the network administrator who needs to implement his or her first firewall.

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  • This book is a practical guide to building your own firewall. It provides step-by-step explanations of how to design and install a firewall at your site and how to configure Internet services such as electronic mail, FTP, the World Wide Web, and others to work with a firewall. Firewalls are complex, though, and we can't boil everything down to simple rules.

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  • This section focuses on the technologies used in various firewalls and how they work. The firewall taxonomy in Figure 2-1 shows the general types of firewalls.

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  • NetFilter, or more commonly known by the name of the manipulation utility, iptables, works, on the surface, similarly to the ipchains firewall code of earlier Linux kernels

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  • This book was written to accomplish one goal: to teach network administrators what they need to know to understand the Internet security threat, the technologies used to prevent it, and the products that exist to help them. It's the book I wish I'd had when I couldn't find a common language between various vendors that I could use to compare firewall literature and books heavy on theory to the marketing blurbs I read on websites, or when I needed help matching a specific customer's requirements to a specific firewall product.

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  • The world of IT is always evolving, but in every area there are stable, core concepts that anyone just setting out needed to know last year, needs to know this year, and will still need to know next year. The purpose of the Foundations series is to identify these concepts and present them in a way that gives you the strongest possible starting point, no matter what your endeavor. Network Security Foundations provides essential knowledge about the principles and techniques used to protect computers and networks from hackers, viruses, and other threats.

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  • The firewall module object must be defined as an internal object in order for remote management to work.

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  • “The highest-performing people I know are those who have installed the best tricks in their lives.”—David Allen, productivity guru 1 Contrary to the popular misuse of the term to denote a computer criminal, a hacker is someone who solves a problem in a clever or non-obvious way. A lifehacker uses workarounds and shortcuts to overcome everyday difficulties of the modern worker: an interrupt-driven existence of too much to do and too many distractions to keep you from doing it.

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  • This appendix explains how you can configure the PIX Firewall to support Microsoft Exchange by creating access-list command statements for NetBIOS and TCP. The example that follows will work for two Windows NT Servers; one on the inside network of the PIX Firewall, and the other on the external network from where you want to send and receive mail. Once Microsoft Exchange is functioning across the PIX Firewall, users can send and receive mail with mail clients on platforms other thanWindows NT.

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  • A layer communicates with the equivalent layer in a different node. In order to get data to a peer layer, though, the layer at the transmitting node gives the data to the layer below it (on the same node), which adds a header containing additional information if necessary, and that layer in turn gives it to the layer below. As the packet is received by the destination node, each layer reads and strips off its own header, so that the packet received by layer n looks to that layer just like it did when it was sent down to layer n−1 for transmission. This seven-layer model...

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  • Attackers can infect your computer with malicious software, or malware, in many different ways. They can take advantage of unsafe user practices and flaws in your computer’s programs (flaws including vulnerabilities and unsecured services and features) and use social engineering (in which an attacker convinces someone to perform an action such as opening a malicious email attachment or following a malicious link). Once your computer is infected, intruders can use the malware to access your computer without your knowledge to perform unwanted actions.

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  • The book is designed to be accessible to motivated IT professionals who want to learn more about the specific attacks covered. In particular, every effort has been made to keep the chapters independent, so if someone is interested in has function cryptanalysis or RSA timing attacks, they do not necessarily need to study all of the previous material in the text. This would be particularly valuable to working professionals who might want to use the book as a way to quickly gain some depth on one specific topic.

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  • Chapter 7 - Quản trị bảo mật cho hệ thống (Security management system). After studying this chapter you will be able to: Understand the purpose of a network firewall and the kinds of firewall technology available on the market; understand the role of routers, switches, and other networking hardware in security; determine when VPN or RAS technology works to provide a secure network connection.

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  • For a long while, commercial banks have been reluctant to get involved in microfinance. On other hand savings banks and socially committed retail banks often lack expertise in microlending and microinsur- ance. However, the performance of some industry players and “pioneer experiences” by mainstream banks over the recent years has demonstrated that microfinance can be both socially-efficient and profitable when well-managed.

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  • The People's Republic of China operates an Internet ltering system which is widely considered to be one of the most sophisticated in the world [9]. It works, in part, by inspecting web (HTTP) trac to determine if speci c keywords are present [8]. These keywords relate to matters such as groups that the Chinese Government has banned, political ideologies that they consider unacceptable and historical events that the regime does not wish to have discussed.

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  • Today's complex multi layered security architecture consists of many devices to ensure that servers, hosts, and applications running on the network are protected from harmful activity. These devices all generate voluminous logs that are difficult and time-consuming to interpret. In a typical enterprise, an intrusion detection system can produce more than 500,000 messages per day and firewalls can generate millions of log records a day.

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