What is Dos And D-Dos?

Dos Attack

What is Dos And D-Dos? – Dos Means Denial Of Service And D-Dos Means Distributed Denial Of Service


Denial of service (DOS) is an attack on a computer or network that reduces, restricts or prevent accessibility of system resources to its legitimate users.

In a DOS attack, attackers flood a victim system with non-legitimate service request or traffic to overload its resources.

Dos attack leads to unavailability of a particular website and slow network performance.

Denial of Service (DOS) is a type of attack in which service offered by a system or a network is denied. Services may either be denied, reduced the functionality or prevent the access to the resources even to the legitimate users.

There are several techniques to perform Dos attack such generating a large number of request to the target system for service. These large number of incoming request overload the systme capacity to entertain resulting denial of service

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Loss Of DOS Attack are;-

  • Slow Performance
  • Increase in spam emails
  • Unavailability of a resource
  • Loss of access to a website
  • Disconnection of a wireless or wired internet conncetion
  • Denial of access to any internet services.

Also Read: How to hack wifi using kali linux

What Is D-Dos Attack?

A Distributed Denial of service (DDOS) attack involves a multitude of compromised systems attacking a single target, thereby causing denial of service for users of the targeted systems.

To launch a DDos attack, an attacker uses botnets and attack a single system.

How D-Dos Work

Normally an establishment of a connection consists of some step in which a user sends a request to a server to authenticate it. The server return with the authentication approval. Requesting user knowledges this approval, and then the connection is established and is allowed onto the server.

In the process of Denial of service attack, the attacker sends several authentication request to the server. These request have fake return addresses, so the server can;t find a user to send the authentication approval. This authentication process waits for a certain time to close the session. The server typically waits more than a minute, before closing the session. The attacker is continuously sending request causing a number of open connections on the server resulting in the denial of service.

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Types of DDos Attack

There are many types of DDoS attacks. Common attacks include the following:

  • Traffic attacks: Traffic flooding attacks send a huge volume of TCP, UDP and ICPM packets to the target. Legitimate requests get lost and these attacks may be accompanied by malware exploitation.
  • Bandwidth attacks: This DDos attack overloads the target with massive amounts of junk data. This results in a loss of network bandwidth and equipment resources and can lead to a complete denial of service.
  • Application attacks: Application-layer data messages can deplete resources in the application layer, leaving the target’s system services unavailable.

Dos vs D-Dos

The differences between regular and distributed denial of service assaults are substantive. In a DoS attack, a perpetrator uses a single Internet connection to either exploit a software vulnerability or flood a target with fake requests—usually in an attempt to exhaust server resources (e.g., RAM and CPU).

On the other hand, distributed denial of service (DDoS) attacks are launched from multiple connected devices that are distributed across the Internet. These multi-person, multi-device barrages are generally harder to deflect, mostly due to the sheer volume of devices involved. Unlike single-source DoS attacks, DDoS assaults tend to target the network infrastructure in an attempt to saturate it with huge volumes of traffic.

DDoS attacks also differ in the manner of their execution. Broadly speaking, denial of service attacks are launched using homebrewed scripts or DoS tools (e.g., Low Orbit Ion Canon), while DDoS attacks are launched from botnets — large clusters of connected devices (e.g., cellphones, PCs or routers) infected with malware that allows remote control by an attacker.

Preparing for Denial Of Service

You can’t prevent DoS assaults. The fact is that cybercriminals are going to attack. Some are going to hit their targets, regardless of the defenses in place.

However, there are steps you can take to spot a brewing storm, including:

  • Monitoring your traffic to look for abnormalities, including unexplained traffic spikes and visits from suspect IP address and geolocations. All of these could be signs of attackers performing “dry runs” to test your defenses before committing to a full-fledged attack. Recognizing these for what they are can help you prepare for the onslaught to follow.
  • Keep an eye on social media (particularly Twitter) and public waste bins (e.g., Pastebin.com) for threats, conversations and boasts that may hint on an incoming attack.
  • Consider using third-party DDoS testing (i.e., pen testing) to simulate an attack against your IT infrastructure so you can be prepared when the moment of truth arrives. When you undertake this, test against a wide variety of attacks, not just those with which you are familiar with.
  • Create a response plan and a rapid response team, meaning a designated group of people whose job is to minimize the impact of an assault. When you plan, put in place procedures for your customer support and communication teams, not just for your IT professionals.

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