A DDoS attack is when a lot of cyber attacking computers coordinate their efforts to send so many packets to their target that it overwhelms the memory buffer on a network interface or firewall so that it stops being able to operate properly.
Although firewalls are a must for network security, an enterprise really needs an IPS device in order to mitigate DDoS attacks. A firewall can be an application built into an operating system, a separate application installed on an operating system, or a dedicated hardware device with specialized software installed on it. Consumers will usually have software firewalls whether or not they've configured it properly. Enterprises will have applications running in operating systems, and firewalls built into specialized network devices.
An enterprise should also have their firewalls constantly produce logs, which go through a SIEM and can be checked by network and security administrators. Kim Crawley spent years working in general tier two consumer tech support, most of which as a representative of Windstream, a secondary American ISP.
Malware related tickets intrigued her, and her knowledge grew from fixing malware problems on thousands of client PCs. Her curiosity led her to research malware as a hobby, which grew into an interest in all things information security related. This October, she gave her first talk at an infosec convention, a penetration testing presentation at BSides Toronto.
She considers her sociological and psychological perspective on infosec to be her trademark. Macros refer to scripts run by applications to automate processes. A macro can contain a series of dependent steps that are all launched by one command.
Hackers design or purchase macros intended to work within certain applications. A macro can be hidden inside seemingly innocent data, and once it enters your computer, it wreaks havoc on your system.
A firewall can detect malicious macros as it examines the packets of data that attempt to pass through. Remote logins are often used to help someone with a computer issue.
However, in the hands of the wrong person, they can be abused, particularly because remote logins provide nearly complete access to your system. Spam can sometimes include links to malicious websites. These types of sites activate malicious code that forces cookies onto a computer. The cookies create backdoors for hackers to gain access to the computer. Preventing a spam attack is often as simple as not clicking on anything suspicious in an email, regardless of who the sender appears to be.
A firewall can inspect your emails and prevent your computer from getting infected. Viruses, once on a computer, copy themselves and spread to another device on the network.
Viruses can be used to do a variety of things, ranging from relatively harmless activity to erasing data on your computer. Firewalls can inspect data packets for viruses, but it is better to use antivirus software in conjunction with a firewall to maximize your security. The Fortinet FortiGate solution is a next-generation firewall NGFW that filters traffic to protect your network from attacks coming from both the outside and within.
As a result, FortiGate can help keep malware out of your system, as well as identify attacks before they affect your network. In addition, FortiGate is constantly updated on the new methods cyber criminals use to infiltrate networks. With this capability, FortiGate is a reflexive, automated threat-detection solution that keeps up with the latest dangers on the landscape.
Skip to content Skip to navigation Skip to footer. How Does a Firewall Work? Contact Us. Hardware Firewalls. Software Firewalls. Firewalls use different methods to protect your network or computer. If you have read the article How Web Servers Work , then you know a good bit about how data moves on the Internet, and you can easily see how a firewall helps protect computers inside a large company.
Let's say that you work at a company with employees. The company will therefore have hundreds of computers that all have network cards connecting them together. In addition, the company will have one or more connections to the Internet through something like T1 or T3 lines. Without a firewall in place, all of those hundreds of computers are directly accessible to anyone on the Internet.
A person who knows what he or she is doing can probe those computers, try to make FTP connections to them, try to make telnet connections to them and so on. If one employee makes a mistake and leaves a security hole, hackers can get to the machine and exploit the hole.
With a firewall in place, the landscape is much different. A company will place a firewall at every connection to the Internet for example, at every T1 line coming into the company. The firewall can implement security rules. For example, one of the security rules inside the company might be:.
In addition, the company can control how employees connect to Web sites, whether files are allowed to leave the company over the network and so on.
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