There are many network threats today, which are spread over the internet. The most common include the following.
1-Viruses
2-Worms
3-Trojan horses
4-Spyware
5-Zero-day attacks, also called zero-hour attacks
6-Denial of service attacks
1-Viruses
- A virus is a computer code (written with the express intention to replicate itself) that can attach itself to a program, file, hardware and can spread computer to computer.
- As a virus move from one computer to another it damages hardware, software and files also.
2-Worms
- Worms are subclasses of viruses, it can spread itself without user action across the network.
- Worms are just like viruses, but the worms have ability to spread themselves so automatically and rapidly.
- For example, if there is a worm in your system, then it can send itself by email to all of your contacts and then these computers further send worms. This causes a heavy stream of network traffic, which can slow down business networks by using network bandwidth.
3-Trojan Horses
- Trojan horses appear to be software, but they compromise with your security and can damage your network hardware, files.
4-Spyware
- Spyware is a general term that is used to describe software which performs the following actions on your computer without your consent (permission).
1- Advertising
2- Collection of personal information.
3- Changing the configuration of your computer.
Above action can slow down or damage your computer.
Spyware can come in the following ways.
1- Application/software installation.
2- Email.
3- Web sites.
5-Zero Day/Zero Hour Attack
- Zero day/zero hour attacks those tries to destroy computer hardware, files and software and about which vendors have no information.
- There is no security available for zero day/zero hour attacks.
6-Denial of Service Attack
- DOS or DDOS is an attempt to make resources unavailable to its intended user.
- One common method of DOS or DDOS is penetrating the target machine with external communication requests.
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