Without realizing it, our use of internet could cause the data we use in the internet can be spread and the most dangerous impact is exposed attacks cyber.
Then how to overcome it? One way we can do is to use a protective system that is commonly used on computers, namely, firewall.
What is a firewall? To understand this better, let’s take a look at the explanation below.
Definition of Firewall
Firewall is a network security system that serves to monitor and control network traffic based on predefined security rules.
Network security system acts as a barrier between a secure internal network and an external network, such as the internet, to prevent unauthorized access, cyberattacks, and other threats.
Network security systems can consist of hardware or software installed on computers or networks.
Firewall Functions
Having understood what a network security system is, it is clear that this system has several functions in addition to those mentioned earlier. The following are some of the functions of a network security system:
1. Protect Data from Hacker and irresponsible users
The function of a network security system is to prevent data theft. the network security system acts as a barrier between the installed data, hacker and foreign users can easily access your data, increasing the risk of theft.
2. Blocking Annoying Messages
Another function of a network security system is to block unwanted messages. For example, if you receive a mysterious message claiming that your computer is at risk and asking you to install a specific programme, this may be a sign that your network security system is not properly configured. One of the tasks of a firewall is to block such disruptive messages.
Therefore, be sure not to skip the installation and configuration process of the network security system on your computer.
3. Blocking unwanted content
As well as blocking spam and viruses, another function of network security systems is to block access to specific websites or content. You can specify which content is permitted or prohibited on your computer.
4. Increase safety and comfort when playing Online games
Another function of network security systems is to ensure a safer online gaming experience. Online gaming carries significant risks due to the rapid exchange of data, which hacker can exploit to inject malware.
Although game servers are generally equipped with security features, having a network security system on your computer is a wise move for additional protection.
5. Monitor Bandwidth Usage
A network security system is not only useful for safeguarding computer network, but also for monitoring and limiting bandwidth usage. You can set limits on entertainment content and prioritise bandwidth for matters that are more important to your business.
6. Accessing the VPN service
The last function of a network security system is to facilitate connection to a Virtual Private Network (VPN). By using this service, users can connect to the internal network as well as access content or sites that may be blocked, which can certainly increase productivity, collaboration, and various data.
Types of Firewall
The following are some types of network security systems:
1. Firewall Packet Filtering
This type of network security system is the most basic and most commonly used. It allows or blocks data packets based on IP address, protocol and port number.
Its advantage is its ease of setup, but its disadvantage is the difficulty in detecting and preventing more complex attacks.
2. Firewall Circuit-Level Gateway
Types of network security systems it operates at the session level and only verifies if the session is legitimate. This Firewall does not analyze the contents of data packets, so it only allows traffic from already authenticated Sessions.
3. Firewall Application-Level Gateway
This type is also known as firewall proxy, this one checks every packet of data coming in and out of the network, determining the security of the packet. This type offers a higher level of security than firewall packet filtering, but also requires more resources
4. Next-Generation Firewall (NGFW)
This type is more advanced than traditional network security systems. NGFWs can inspect the contents of data packets to determine their security and also analyse data as it is being processed, enabling them to block more complex attacks such as zero-day attacks.
5. Stateful Multilayer Inspection (SMLI) Firewall
This type of network security system is capable of assessing data traffic at various layers, including OSI Layer 3 and Layer 4. this network security system also analyzes the flow of data that is being processed and checks incoming and outgoing connections from the network.
6. Firewall Hardware
This type is a special hardware designed for the functioning of network security systems. Hardware network security systems are usually more advanced than software network security systems and often come with additional security features, such as antivirus, anti-spam, and anti-malware.
Benefit of Firewall
Here are some benefits of network security systems are among others:
1. Higher computer security
One of the main benefits of a network security system is that it improves computer security. This system acts as a shield that blocks the entry of threats such as malware and fraud into the system.
In an age where computers are almost always connected to the internet, the existence of a network security system is becoming increasingly crucial to protect your devices.
2. A Website protected from dangerous threats
In addition to protecting computers, the benefits of network security systems are also to keep websites safe from various dangerous threats. Some types of network security systems are specifically designed to protect servers as well as the content contained in them.
3. Avoid Losses Due To Data Theft
Another benefit of network security systems is that they protect personal and valuable data from access hacker and the responsible party, you can prevent potential losses. Without network security system, your personal information could be misused for fraud or identity theft.
4. Prevent access to malicious content
Finally, the network security system helps prevent access to malicious content. This is in line with its function to block unwanted content, which is increasingly widespread on the internet.
Network security systems are extremely useful, especially if you have young children using the internet, as they may not yet be able to distinguish between safe and harmful content.
How a Firewall Works
A network security system works by filtering data (packets) travelling between the network and the internet. This system is capable of determining whether a particular packet can be accessed by a specific computer or not.
To help you understand better, here is how a network security system works.
1. Packet Filtering (Stateless)
The first method of how a network security system works involves the use of certain rules to assess whether a data is allowed into the network. Each package is inspected individually or in isolation. If packets are sent in groups, then each packet will be analyzed individually.
Packets deemed malicious will not be allowed in, while packets judged safe will be forwarded to the system performing the request.
2. Proxy Service
A proxy service acts as an intermediary between network systems. In this particular network security system, the proxy application is integrated into the network security infrastructure and is responsible for inspecting the packets being transferred across the network.
This system can be considered more effective because all information is checked centrally. This type of network security system is more sophisticated, as free online proxy services attempt to establish a connection between networks in a similar way.
Although a proxy appears to connect networks directly, it actually only mimics a similar mechanism.
3. Stateful Inspection
The way this network security system works involves checking incoming packets against previous activity. Incoming packets are then checked against the packet database. If the packet is deemed safe or poses no risk, it is forwarded to the requesting system.
Once the network security system has finished inspecting the packet, it will respond with one of three options:
- Receive (accept), meaning network security system will allow traffic to pass through the network.
- Rejected (reject), which means network security system refusing traffic to pass and giving an error message “unreachable”
- Throw (drop), where the network security system reject traffic without sending any message.
Advantages of a Firewall
The following are some of the advantages of a firewall:
1. Network Protection
The first advantage of a firewall is that it can protect a network from unwanted attacks such as viruses, malware and hackers. A firewall helps control access to the network and provides extra protection for connected devices.
2. Data Traffic Monitoring
The second advantage of a firewall is that it can monitor data traffic and all information entering and leaving the network. In this way, the firewall can detect suspicious activity or malicious attacks and alert the network administrator.
3. Improved Network Performance
Another advantage of a firewall is that it can improve network performance by blocking unnecessary traffic, thereby helping to maintain a smooth-running network without any drop in performance caused by excessive traffic.
4. Internet Access Management
Another advantage of a firewall is that it can restrict access to unwanted websites and applications, maintain network performance and prevent unproductive or harmful internet usage.
Disadvantages of a firewall
As we know, nothing in life is perfect, and the system we are discussing here also has a few shortcomings. The following are some of the shortcomings of firewall :
1. Cost
The first drawback of a firewall is that it can be quite expensive to implement, particularly if a company opts for high-end hardware.
2. Influence on performance
The second drawback of a firewall is that it can affect network performance and may slow down data traffic if not configured properly.
3. Dependence on the Administrator
Another drawback of firewall is that they require skilled administrators to operate and maintain them. Without competent administrators, firewalls may not function optimally and may fail to provide adequate protection.
4. Not Always Effective
Another drawback of firewall is that, although they help to protect networks, there is no guarantee that they will always function properly. Sophisticated attacks can still breach firewalls and disrupt networks even when the firewall are operating effectively.
Conclusion
That concludes this article. In summary, a firewall is a network security system designed to monitor and control data traffic based on predefined rules.
Although firewall offer many benefits, they also have drawbacks such as high costs, an impact on network performance, and a reliance on skilled administrators. However, when used correctly, firewalls are extremely useful for maintaining network security and efficiency.
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