The main technologies of firewall include network layer firewall, application layer firewall, packet filtering firewall and stateful inspection firewall. Detailed introduction: 1. Network layer firewall, which filters and controls network traffic based on network protocols and IP addresses; 2. Application layer firewall, which performs in-depth detection and filtering of application layer protocols to provide more refined access control and security protection; 3. . Packet filtering firewall, which filters and controls network packets according to preset rules; 4. Stateful detection firewall, monitors and analyzes network connections, and decides whether to allow data packets to pass through based on the status of the connection.
The main technologies of firewall include network layer firewall, application layer firewall, packet filtering firewall and stateful inspection firewall.
Network layer firewall is a firewall technology located at the network layer. It filters and controls network traffic based on network protocols and IP addresses. The network layer firewall can decide whether to allow data packets to pass based on information such as source IP address, destination IP address, protocol type, and port number. It can prevent unauthorized access and malicious attacks and improve network security.
Application layer firewall is a firewall technology located at the application layer. It can perform in-depth inspection and filtering of application layer protocols to provide more granular access control and security protection. Application layer firewalls can identify and block malware, network worms, and other malicious behaviors to protect system and data security.
Packet filtering firewall is a firewall technology based on network packets. It filters and controls network packets according to preset rules. Packet filtering firewalls can decide whether to allow data packets to pass based on information such as source IP address, destination IP address, protocol type, port number, and data packet content. It can prevent unauthorized access and malicious attacks and improve network security.
Stateful inspection firewall is a firewall technology based on connection status. It can monitor and analyze network connections and decide whether to allow data packets to pass based on the status of the connection. Stateful inspection firewalls can identify and block malicious connections, network scans, and other malicious behavior, providing a higher level of security protection.
In addition to the above main technologies, firewalls can also use other technologies to improve network security. For example, an intrusion detection system (IDS) monitors network traffic and detects potential intrusions. A virtual private network can protect data transmission security through encryption and tunneling technology. Network isolation technology can divide the network into multiple independent security zones to limit the spread of network traffic.
In short, the main technologies of firewall include network layer firewall, application layer firewall, packet filtering firewall and stateful inspection firewall. These technologies can provide different levels and granularity of access control and security protection, helping to protect the network from unauthorized access and malicious attacks. Additionally, there are other technologies that can be used in conjunction with firewalls to further increase the security of your network .
The above is the detailed content of What are the main technologies of firewalls?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
How to fix 'Error: 0x80070185, Cloud operation was unsuccessful” in OneDrive
May 16, 2023 pm 04:26 PM
OneDrive is a popular cloud storage application provided by Microsoft. Most of us use OneDrive to store our files, folders, documents, etc. But some users complained that when they try to access shared files on OneDrive, it gives an error stating “Error: 0x80070185, Cloud operation was unsuccessful”. Therefore, they cannot perform any operations on OneDrive such as copying files, pasting, downloading shared files, etc. Nowadays, it is necessary to use these operations in our daily work. This error can be easily solved and for this we have some methods that we can apply and try to solve the problem. let's start! Method 1 – Sign out and sign back in to OneDrive app steps
How to solve if Edge browser is blocked by firewall?
Mar 13, 2024 pm 07:10 PM
How to solve the problem that the Edge browser is blocked by the firewall? Edge browser is Microsoft's own browser. Some users found that this browser was blocked by the firewall during use. So what's going on? Let this site give users a detailed introduction on how to recover the Edge browser if it is blocked by the firewall. How to restore the Edge browser if it is blocked by the firewall? 1. Check the firewall settings: - Click the "Start" button on the Windows taskbar, and then open "Settings". -In the Settings window, select Update & Security. -exist
Win11 firewall advanced settings gray solution
Dec 24, 2023 pm 07:53 PM
When setting up the firewall, many friends found that their win11 firewall advanced settings were grayed out and unable to be clicked. This may be caused by not adding a control unit, or by not opening the advanced settings in the correct way. Let’s take a look at how to solve it. Win11 firewall advanced settings gray method one: 1. First, click the start menu below, search and open "Control Panel" at the top 2. Then open "Windows Defender Firewall" 3. After entering, you can open "Advanced Settings" in the left column . Method 2: 1. If the above method cannot be opened, you can right-click "Start Menu" and open "Run" 2. Then enter "mmc" and press Enter to confirm opening. 3. After opening, click on the upper left
8 Big Fixes if Grammarly Not Working on Windows 10 Browser
May 05, 2023 pm 02:16 PM
If you have syntax issues on your Windows 10 or 11 PC, this article will help you solve the problem. Grammarly is one of the most popular typing assistants for fixing grammar, spelling, clarity, and more. It has become an essential part of writing professionals. However, if it doesn't work properly, it can be a very frustrating experience. Many Windows users have reported that this tool does not work well on their computers. We did an in-depth analysis and found the cause and solution of this problem. Why doesn't Grammarly work on my PC? Grammarly on PC may not work properly due to several common reasons. It includes the following
Fix: Windows 11 Firewall blocks printer
May 01, 2023 pm 08:28 PM
Firewalls monitor network traffic and can block network connections for certain programs and hardware. Windows 11 includes its own Windows Defender Firewall, which may block printers from accessing the web. Therefore, affected users cannot use their Brother printers when the firewall blocks it. Keep in mind that this issue affects other brands as well, but today we’ll show you how to fix it. Why is my Brother printer blocked by the firewall? There are several causes for this issue, and you will most likely need to open certain ports before your printer can access the network. Printer software can also cause problems, so be sure to update it as well as your printer driver. Read on to learn how
Resolve error code 0xc004f074 when activating Windows 11.
May 08, 2023 pm 07:10 PM
After installing the latest operating system on your PC, activating your copy of Windows 11 is the main job. Not only does it unlock the true potential of the Windows 11 operating system, but it also gets rid of the annoying "Activate your Windows 11" message. However, for some users, Windows 11 activation error 0xc004f074 hinders the smooth progress of activation. This bug apparently prevents users from activating Windows 11 and forces them to use an operating system with limited functionality. Windows 11 activation error code 0xc004f074 is related to the Key Management Service. You will encounter this problem when KMS is unavailable. Okay, that's it for this tutorial
How to enable or disable firewall on Alpine Linux?
Feb 21, 2024 pm 12:45 PM
On AlpineLinux, you can use the iptables tool to configure and manage firewall rules. Here are the basic steps to enable or disable the firewall on AlpineLinux: Check the firewall status: sudoiptables -L If the output shows rules (for example, there are some INPUT, OUTPUT, or FORWARD rules), the firewall is enabled. If the output is empty, the firewall is currently disabled. Enable firewall: sudoiptables-PINPUTACCEPTsudoiptables-POUTPUTACCEPTsudoiptables-PFORWARDAC
How to remove the firewall logo on the Win10 desktop icon?
Jan 01, 2024 pm 12:21 PM
Many friends who use win10 system find that there is a firewall logo on the icon on the computer desktop. What is going on? This makes many friends with obsessive-compulsive disorder particularly uncomfortable. In fact, we only need to open the control panel and click " It can be solved by changing "Change User Account Control Settings". Let's take a look at the specific tutorial. How to cancel the firewall logo on the desktop icon in Windows 10 1. First, right-click the Start menu button next to the computer startup screen, and then select the Control Panel function from the pop-up menu. 2. Then select the "User Account" option and select the "Change User Account Control Settings" item from the new interface that appears. 3. After adjusting the slider in the window to the bottom, click Confirm to exit.