Computer Firewall Basic Concepts

A firewall is a system designed to prevent unauthorized access to or from a private network. Firewalls can be implemented in both hardware and software, or a combination of both. Firewalls are frequently used to prevent unauthorized Internet users from accessing private networks connected to the Internet, especially intranets.  All messages entering or leaving the intranet pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria.

There are several basic types of firewall technologies:

• Packet filter: Looks at each packet entering or leaving the network and accepts or rejects it based on user-defined rules. Packet filtering is fairly effective and transparent to users, but it is difficult to configure. In addition, it is susceptible to IP spoofing.


• Application gateway: Applies security mechanisms to specific applications, such as FTP and Telnet servers. This is very effective, but can impose a performance degradation.


• Circuit-level gateway: Applies security mechanisms when a TCP or UDP connection is established. Once the connection has been made, packets can flow between the hosts without further checking.


• Proxy server: Intercepts all messages entering and leaving the network. The proxy server effectively hides the true network addresses.

In practice, many firewalls use two or more of these technologies together. A firewall is considered a first line of defense in protecting private information. For greater security, data can be encrypted.

Related Brands
Barracuda Networks
Cisco Systems
Trend Micro
Sonicwall
Juniper Networks
Nokia
Nortel
Watchguard

Computer Firewall Basic Concepts

A firewall is a system designed to prevent unauthorized access to or from a private network. Firewalls can be implemented in both hardware and software, or a combination of both. Firewalls are frequently used to prevent unauthorized Internet users from accessing private networks connected to the Internet, especially intranets.  All messages entering or leaving the intranet pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria.

There are several basic types of firewall technologies:

• Packet filter: Looks at each packet entering or leaving the network and accepts or rejects it based on user-defined rules. Packet filtering is fairly effective and transparent to users, but it is difficult to configure. In addition, it is susceptible to IP spoofing.


• Application gateway: Applies security mechanisms to specific applications, such as FTP and Telnet servers. This is very effective, but can impose a performance degradation.


• Circuit-level gateway: Applies security mechanisms when a TCP or UDP connection is established. Once the connection has been made, packets can flow between the hosts without further checking.


• Proxy server: Intercepts all messages entering and leaving the network. The proxy server effectively hides the true network addresses.

In practice, many firewalls use two or more of these technologies together. A firewall is considered a first line of defense in protecting private information. For greater security, data can be encrypted.

Related Brands
Barracuda Networks
Cisco Systems
Trend Micro
Sonicwall
Juniper Networks
Nokia
Nortel
Watchguard

Steps To Follow After You Purchase A New Printer

There are several important things to consider after purchasing new printer/s. First things first, one must make sure to check the unit for physical defects when the printer is taken out from the box. If you find something, it is very important to immediately contact the store where you purchased the item for replacement. Next, find the warranty certificate and place it somewhere safe. The warranty will be very handy when problems eventually arrive. Another is to copy the serial numbers visible from the printer and copy the product number. Now we move on to the installation and testing. First, to do this with ease, check the box for the instruction manual and follow the steps/procedures indicated. Then install the driver so that you can maximize the features of your new printer. And lastly, print a copy in black and colored version to check its color accuracy.

Explanation About the VGA VGA stands for

Explanation About the VGA

VGA stands for Video Graphics Adapter, a function of the VGA card is to add graphics to your computer so it can display a maximum computer graphics and has a high resolution, VGA Card is required for you lovers of games or so-called gamers, due to the Game high quality is required of high-quality VGA card anyway. Similarly with your work or school or majoring in the field of Graphic Design, you must use a VGA card to a picture or graph that can be made up and the results of our work can be satisfying. But not only the VGA that you need but have no support from other device such as LCD Flat Monitor, Mother
By: Fathurahman