No fewer anti-virus software network firewalls

Many of my friends believe that the system is absolutely safe as long as anti-virus software is installed. This idea is absolutely undesirable! In today's network security environment, Trojans, viruses, and frequent hacker attacks are rampant, while various rogue software and spyware are also rampant. How can we establish our system in such a sinister network environment? Does anti-virus software alone ensure the security of our systems? Next I will analyze the importance of firewall from several aspects that affect system security.

Today's network security threats mainly come from virus attacks, Trojan attacks, hacker attacks, and spyware attacks. Nowadays, viruses and Trojans are updated quickly. from a global perspective, most of the virus and Trojans that can cause large losses are newly generated or variants.

Why does the Firewall Block virus Trojans and even the latest virus and Trojan variants? This should begin with the firewall's defense mechanism. The firewall monitors data packets connected to the network. That is to say, the firewall is equivalent to a strict guard in charge of all the doors (ports) of the system ), it is responsible for verifying the identity of the person in and out, and everyone needs to get the permission of the highest chief executive, and the highest chief executive is yourself. Whenever an unknown program wants to enter the system or connect to the network, the firewall immediately intercepts the program and checks its identity, if you permit the access (for example, you allow a program to connect to the network in the application rule settings), the firewall will allow all the packets sent by the program, if you detect that this program has not been permitted to allow, the system will automatically trigger an alarm and send a prompt indicating whether to allow the program to allow it. At this time, you need to determine the "supreme commander. In general, we will block programs that we do not have or do not know very well, and confirm the nature of the software through prompts from search engines or firewalls.

Here, we may have some knowledge about the differences between anti-virus software and firewall. For example, your system is like a castle. You are the chief of this castle, anti-virus software and firewall are responsible for security guards. Anti-virus software is responsible for identifying the people entering the castle. If suspicious people are found, they will be caught (of course, there is a high chance of catching errors, otherwise there will not be so many false positives ); the firewall is a guard who checks every person who enters or exits the castle. Once the person who finds that no pass is found, the firewall confirms with the commander-in-chief. Therefore, any trojan or spyware may secretly record your account and password under the eyes of anti-virus software. However, because the firewall sees the gate dead, no more information can be transmitted, this protects your system security.

In addition, anti-virus software is useless for hacker attacks. Because hacker operations do not have any signatures, anti-virus software cannot identify them, the firewall can hide every port of your system, so that hackers cannot find the entry, thus ensuring system security.