Understand the denial of service DoS in the Internet

Denial of service attacks are a common concept in network security and security. This is a simple, yet sophisticated form of attack. Taimienphi will introduce you details about denial of service attacks on the Internet.

DoS (Denial of Service) – denial of service attack is a form of attack with The purpose is to interrupt the service of a website or a system by many different methods. An attacker will somehow try to prevent users from accessing information and resources from a service or website by interrupting, overloading or slowing down the system.

One of the most common DOS attacks is that an attacker will attempt to overload the system by accessing a large number of virtual clients at the same time. At that time, your access to the service will be interrupted because the server could not process your request. Similar to this mechanism, an attacker can send a series of junk emails to your email until it reaches the limit of each mail service, your email is likely to be “flooded” and unable to receive these messages. other email

What is DDOS?

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DDOS (Distributed Denial of Service) Distributed denial-of-service attacks – are a common form of DOS attack due to their size and scope. Somehow, a hacker will gain control of your entire system to become part of an attacker system. Your computer will become part of the BOTNET (computer network ghost) to perform attacks on services such as banking services, sending spam emails, attacks that overflow server memory …

Because many computers are used at the same time, this is called a distributed denial of service attack.

Identify DOS and DDOS

There are many phenomena that you can conclude as a result of a DOS or DDOS attack, however, not all system disruptions are concluded as a result of the attack. You can refer to the following phenomena to identify DOS and DDOS:

– Access to the network is slow but not due to network infrastructure
– Can’t access the website
– The number of spam messages increases abnormally

How to prevent DOS and DDOS

For system administrators

Enhancing system security, using system security technologies on hardware and software, maintaining firewall performance.

For public folders that have been requested by DDOS, it is possible to create files continuously.htaccess with the file content

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Also create files antiddos.phtml with content

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For general users

You need to maintain the security of information to avoid malicious code by a number of methods:

– Install and regularly update security and anti-virus software
– Use positive mail filters to avoid spam mail
– Install and maintain a firewall on each computer, limiting traffic.
– Do not provide personal email too widely on the Internet

The above are basic knowledge of DOS denial attacks. What to do to avoid is always updating knowledge of security, network security, protecting yourself against information security risks, fastest updating new technologies on both hardware and hardware. Soft to prevent DDOS for the system. In addition, you should also regularly check and remove trojans manually and update anti-virus software to protect your computer.

Currently, there are many anti-virus software to protect the computer 24/24 such as Bkav, Kis, Avas … depending on the computer configuration, users can download and use anti-virus software for their computers. .


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