Web application security

In the era where computer viruses are getting more and more rampant, Web application users are supposed to pay high attention to commonly seen computer viruses and corresponding solutions, so as to maintain Web application security. In this article, we would like to introduce Web application security issue – DDoS attacks. Considering the very fact that DDoS attacks may be unfamiliar to some Web application users, we will show what exactly DDoS is via the following demonstration.
DDoS DDoS is short for Distributed Denial of Service. To be specific, all behaviors which can lead legal users to fail in getting normal network service belong to DDoS attacks. The exact aim of DDoS attacks is to prevent legal users from accessing network resources, so as to achieve their ulterior aims.
The difference between DOS and DDoS (both of them pose high risk to Web application security) lies in that DDoS implements its attack via sending nbso online casino lots of illegal network packets to victim host with the help of "zombie host" (Attacker-invaded or indirect host), generating network congestion or server resource depletion , and finally denial of service. In such cases, the legal network packets will get swallowed by attack packets, and legal users fail to access to network resources on the server. Therefore, DDoS attacks are also called "flood attack".
The commonly seen means of DDoS attacks include SYN Flood, ACK Flood, UDP Flood, ICMP Flood, TCP Flood, Connections Flood, Script Flood, Proxy Flood, etc. However, DOS implements its attack via the way of attacking specific bugs to cause network stack failure and system crash. The commonly seen approaches of DOS attacks include TearDrop, Land, Jolt, IGMP Nuker, Boink, Smurf, Bonk, OOB, etc. When compared with DOS, DDoS is of higher risk, for it is hard for Web application users to prevent DDoS attacks. However, users can effectively prevent DOS attacks via patching host server or installing firewall so as to protect Web application security.
Symptoms of DDoS attacks The biggest threat to Web application security - DDoS usually implements traffic attack, the attack aiming at network broadband service. In this condition, numerous attack packets will lead to network congestion, while legal network packets can not be delivered to specified server host. Also, there is another type of DDoS attacks aiming to deplete network resources of server host. Under certain circumstance, the attack packets may run out of host memory or make core or applications occupy all CPU resources.
With the sharp increase of Internet users and unceasing development of DDoS, the implementation of DDoS attacks gets easier and easier. Resulting from business competition, malicious retaliation, network extortion and other factors, DDoS attacks concern numerous network service providers who serve IDC room hosting, commercial workstation, game server, chat room network, etc. Moreover, they have to suffer from legal disputes, economical losses and other severe issues. As we can see, how to prevent DDoS attacks so as to maintain Web application security becomes a leading concern for all network service providers.