If you really want to defend yourself against spyware, then you are going to need to have a firewall on your computer. This is a form of computer security that will block any unauthorized access to your computer or the local area network (LAN) that you are on. A firewall is a great defense against any type of spyware that you may encounter. This works by transferring traffic between computer networks.
Each of these networks is given a trust level that you set within the firewall itself. For instance, the Internet is usually considered to be a zone that you do not, whereas an internal network would be given a higher level of trust by your firewall. Of course, you can also set an intermediate amount of trust for various things as well.
In order for your firewall to be worthwhile, you are going to need to make sure that it is properly configured. Using standard security practices will only allow you to have access to the network connections that you have explicitly allowed. However, in order for this to work, you are going to need to have a detailed understanding of the network applications that will need to be used by the organization on a day-to-day basis.
Unfortunately there are a lot of people who do not understand this and therefore they implement a "default-allow" rule set. Herein all traffic is allowed access to your computer unless it has been specifically blocked. This is not good because it inadvertently allows the network connections to be compromised.
Whenever you have your firewall set up properly, it can do a lot of great things. For instance, it will tell you how many time someone has tried to hack into your computer and it will also eliminate and destroy any incoming spyware and adware. Nevertheless, just having a firewall is not enough. You will also need other protection.
Your home computer should have firewall, virus scanner and anti-spyware or anti-adware software installed. Keep these software updated with latest security patches and latest updates to avoid any intrusion happening in your system.
Function of Firewall
The basic role of firewall is to monitor or regulate the traffic between computer networks with different security and trust level. Internet is open zone with no trust and when you are connecting your system, which is high trust zone to internet, you are open to internet attacks. What you need is an intermediate layer, where before downloading any data packet or any internet request is verified for virus, spyware, adware or any other kind of security threat to your system.
This intermediate layer is also called as demilitarized zone (DMZ). This ensures all security risks are analyzed outside the system and helps in minimizing in attacks on your system. Now, firewall can be hardware or software, depending upon needs of an individual or a company. Big companies create DMZ area where all request are scanned and verified before they are allowed to access company systems. The DMZ servers help corporate business in safeguarding their vital data. On an individual level firewall software is installed to cover system/application software from getting infected by virus or worms. Firewall creates security ring around your system to avoid attack from spyware, adware or any other kind of virus being installed on your system.
Types of Firewall
Network layer and packet filters
These are also called as packet filters. The packet filters operate relatively at low level of the communication stack. The packet filters will ensure no communication packet passes without meeting rule set established by firewall. The rule set can be defined either during installation of firewall or later can be changed by administrator of system.
Application Layer
This type of firewall works on application level, such that traffic related to browser or FTP is monitored for authorization and security risk. The firewall will intercept all packets moving from one application to other application and blocks improper content, unwanted traffic to secure applications.
Network address translation
This relates to hiding the true address of protected host machine. Firewall has NAT functionality to protect true address of host. The NAT stands for "Network Address Translation" and is used as defense mechanism against network reconnaissance.
Finally, firewall blocks security attacks to your computer, keeps hackers away from your system, hides system address and creates safe and secure environment for your business or your personal system to work seamless.
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