A firewall is simply a program or hardware device that filters the information coming through the Internet connection into your private network or computer system. If an incoming packet of information is flagged by the filters, it is not allowed through.
Firewalls use one or more of three methods to control traffic flowing in and out of the network:
* Packet filtering - Packets (small chunks of data) are analyzed against a set of filters. Packets that make it through the filters are sent to the requesting system and all others are discarded.
* Proxy service - Information from the Internet is retrieved by the firewall and then sent to the requesting system and vice versa.
* Stateful inspection - A newer method that doesn't examine the contents of each packet but instead compares certain key parts of the packet to a database of trusted information. Information traveling from inside the firewall to the outside is monitored for specific defining characteristics, then incoming information is compared to these characteristics. If the comparison yields a reasonable match, the information is allowed through. Otherwise it is discarded.
DNS Hijacking mean hijacker spoof the ip of any DNS query. Lets example. user send a DNS requset for YAHOO.com and Hijacker hijack this packet & answer on behalf of DNS and give the wrong IP Assres.
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Firewalls can't protect very well against things like viruses or malicious software (malware). There are too many ways of encoding binary files for transfer over networks, and too many different architectures and viruses to try to search for them all. In other words, a firewall cannot replace security-consciousness on the part of your users. In general, a firewall cannot protect against a data-driven attack--attacks in which something is mailed or copied to an internal host where it is then executed.
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Properly configured firewalls can limit the propagation of worms - a form of malware. Typically, firewalls are edge or parameter devices (separates network zones) and most viruses and malware targets end points (user workstations and servers).
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Tuesday, November 06, 2007
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software,
data,
encoding,
security,
transfer,
computer,
firewall,
viruses,
malware,
binary files,
networks,
security-consciousness,
internal host
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Its a Mercury interactive's Test management tool. It includes all the features we need to organize and manage the testing process.
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Tuesday, May 13, 2008
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Office SharePoint Server 2007 provides a single integrated platform to manage intranet, extranet,
and Internet applications across the enterprise.
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Tuesday, May 13, 2008
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Microsoft Windows SharePoint Services Technical security measures provide firewall protection,
intrusion detection, and web-publishing rules. The Microsoft operation center team tests and
deploys software updates in order to maintain the highest level of security and software reliability.
Software hot-fixes and service packs are tested and deployed based on their priority and level of
risk. Security related hot-fixes are rapidly deployed into the environment to address current
threats. A comprehensive software validation activity ensures software stability through regression
testing prior to deployment.
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Tuesday, May 13, 2008
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Yes. You can manage this process using the Administration Site Settings. Simply add users via
their e-mail alias and assign permissions such as Reader or Contributor.
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Tuesday, May 13, 2008
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