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The unscrupulous users can use different ways to access the unprotected computers. There might be case when someone has got access to your remote login and control it in some form. This control can range from simple viewing files to the complete access of computers.

You can allow or stop the remote access by using Application blocker. There might be some bugs in other programs through which users can get hidden access with some level of control. Emails are usually sent via SMTP protocol over internet. The users can send unsolicited emails or spasm by gaining access to the list of email addresses. It is usually done by the redirection of emails through SMTP server. It is very difficult to trace the spam for the sender.

There might also be some problems with the operating systems. Some operating systems might provide access to the other users with insufficient security control or there might be bugs which hackers have used to get benefit of. Denial of service is very difficult to counter. The hackers send request to the server to connect to it. The server can not find the system which has made request on the response with acknowledgement. The hackers can slow down the server with these unanswerable session requests which will eventually crash.

Email bomb is a form of personal attack. There are hundreds or thousands of emails sent by some other users to your email until your email systems can not accept any more messages. You can create script of commands which is known as macros in many applications to simplify the complicated procedures. The hackers have created their own macros which can destroy your data very easily depending on the applications.

Virus is the most common threat for the computers. It is a small program which can copy itself very easily and spreads very quickly from one computer to other. The viruses are dangerous enough to erase all your data. There are also spasm which are harmless but very annoying. Spasm can be dangerous as well and come in the junk email containing links of websites. You should be very careful in opening junk emails as there might be chances of spasm.

You can change the path of your information by sending ICMP to change direction to different router. In this way you can set up denial of service attack. The routers are used to determine the path of the packets traveling on internet. The source can also arbitrary specify the route that packet should travel. The hackers can use sometimes these information and appear from a trusted source or even inside of network. The source can be disabled by the firewall products by default.

Sometime it can be difficult to filter these items by using a firewall but you can have the protectios against virus in the firewall. Therefore you will not require antivirus program in your computers. You can be able to determine threats which can be stooped with the help of the level of security set by you. It is good for the users to block everything first and then select what type of traffic you want to stop. You can allow only certain type of information like emails by restricting traffic. It is important for the businesses to determine what they need and they should also know what traffic they should allow through. Most of the users can work with the defaults provided by the firewall developer.

The good thing about the firewall security is that it protects you from unauthorized access to your computer from other users. There can not be problems with the home networks and it can be used by most of the businesses. The firewall security provides peace of mind to the users.