Figure 11-13 Virtual network created by the honeypot in Software

Making QR Code in Software Figure 11-13 Virtual network created by the honeypot

Figure 11-13 Virtual network created by the honeypot
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11: Intrusion Detection Systems
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EXAM TIP A honeypot is a system designed to attract potential attackers by pretending to be one or more systems with open network services A honeynet is a collection of two or more honeypots Larger, very diverse network environments can deploy multiple honeypots (thus forming a honeynet) when a single honeypot device does not provide enough coverage Honeynets are often integrated into an organization-wide IDS/IPS as the honeynet can provide relevant information about potential attackers
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Firewalls
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Arguably one of the first and most important network security tools is the firewall A firewall is a device that is configured to permit or deny network traffic based on an established policy or rule set In their simplest form, firewalls are like network traffic cops; they determine which packets are allowed to pass into or out of the network perimeter The term firewall was borrowed from the construction field, in which a fire wall is literally a wall meant to confine a fire or prevent a fire s spread within or between buildings In the network security world, a firewall stops the malicious and untrusted traffic (the fire) of the Internet from spreading into your network Firewalls control traffic flow between zones of network traffic; for example, between the Internet (a zone with no trust) and an internal network (a zone with high trust) (Personal software firewalls were already discussed in this chapter; for more discussion on network firewalls refer to 8)
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PART IV
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Proxy Servers
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Though not strictly a security tool, a proxy server can be used to filter out undesirable traffic and prevent employees from accessing potentially hostile web sites A proxy server takes requests from a client system and forwards it to the destination server on behalf of the client Proxy servers can be completely transparent (these are usually called gateways or tunneling proxies), or a proxy server can modify the client request before sending it on or even serve the client s request without needing to contact the destination server Several major categories of proxy servers are in use: Anonymizing proxy An anonymizing proxy is designed to hide information about the requesting system and make a user s web browsing experience anonymous This type of proxy service is often used by individuals concerned with the amount of personal information being transferred across the Internet and the use of tracking cookies and other mechanisms to track browsing activity Caching proxy This type of proxy keeps local copies of popular client requests and is often used in large organizations to reduce bandwidth usage and increase performance When a request is made, the proxy server first checks to see whether it has a current copy of the requested content in the
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CompTIA Security+ All-in-One Exam Guide
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cache; if it does, it services the client request immediately without having to contact the destination server If the content is old or the caching proxy does not have a copy of the requested content, the request is forwarded to the destination server Content filtering proxy Content filtering proxies examine each client request and compare it to an established acceptable use policy Requests can usually be filtered in a variety of ways including the requested URL, destination system, or domain name or by keywords in the content itself Content filtering proxies typically support user-level authentication so access can be controlled and monitored and activity through the proxy can be logged and analyzed This type of proxy is very popular in schools, corporate environments, and government networks Open proxy An open proxy is essentially a proxy that is available to any Internet user and often has some anonymizing capabilities as well This type of proxy has been the subject of some controversy with advocates for Internet privacy and freedom on one side of the argument, and law enforcement, corporations, and government entities on the other side As open proxies are often used to circumvent corporate proxies, many corporations attempt to block the use of open proxies by their employees Reverse proxy A reverse proxy is typically installed on the server side of a network connection, often in front of a group of web servers The reverse proxy intercepts all incoming web requests and can perform a number of functions including traffic filtering, SSL decryption, serving of common static content such as graphics, and performing load balancing Web proxy A web proxy is solely designed to handle web traffic and is sometimes called a web cache Most web proxies are essentially specialized caching proxies Deploying a proxy solution within a network environment is usually done by either setting up the proxy and requiring all client systems to configure their browsers to use the proxy or by deploying an intercepting proxy that actively intercepts all requests without requiring client-side configuration From a security perspective, proxies are most useful in their ability to control and filter outbound requests By limiting the types of content and web sites employees can access from corporate systems, many administrators hope to avoid loss of corporate data, hijacked systems, and infections from malicious web sites Administrators also use proxies to enforce corporate acceptable use policies and track use of corporate resources
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