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In the modern world, we are using continuously developing technological devices for our day-to-day life. There are advantages and disadvantages while using these types of equipment. So, we must be more careful about independence and self-security. Everybody uses a complex process of information storage via internet. Anybody can enter the internet and can do browsing with any data that may be personal or public.

What is firewall

A firewall is an important network security device that controls incoming and outgoing network traffic and allows or blocks data packets using a set of security rules. Its reason is to keep a barrier between the internal network and incoming traffic from external sources such as the internet and malicious traffic like viruses and hackers.

 Your network will be protected by filtering traffic and preventing unauthorized outsiders from accessing your personal information.

An effective firewall will not only keep your computer safe from unwanted traffic, but it will also keep malicious software from infecting it.

Depending on the types of firewall, different levels of protection are available. The key is figuring out how much protection you need.

Why do we need firewall?

As you know, we are already aware of certain safe computer and internet use practices such as,

  • Not to click on unknown links or attachments.
  • Not to give out any personal information unnecessarily.
  • Log only on to trustworthy, known websites.
  • Have strong, unique, complex passwords for your account and update often.

These things are not enough for the security of your pc?

It’s a good idea to have a firewall in place if you use the Internet. Existing cyberthreats are many and constantly evolving. Your network as well as the personal information stored on your computer must be protected by it, against cybercrime by utilizing all available defenses.

What does a firewall do?

A firewall acts as a security guard. It watches out the attempts to enter your operating system and blocks unwanted traffic or unknown sources.

How is it done? A firewall acts as a barrier or traffic controller. It protects your network and information by managing your network traffic, validating access by assessing network traffic and blocking unsolicited incoming network traffic.

A pre-installed firewall comes with your operating system and your security software, usually on your computer. It’s good to make sure those features, and security settings are turned on and run updates automatically.

How does a firewall work?

A firewall is a border established between an external network and the network it guards. It is connected inline across a network connection and supervise all packets entering and leaving the guarded network. When it inspects, it uses a set of pre-set rules to distinguish between good and malicious packets.

‘Packets’ means pieces of data formatted for internet transfer. Packets contain data and information about the data, such as where they come from. Firewalls can determine whether these packets of information abides by the ruleset. If not, the packet will be blocked from entering the guarded network.

Rule sets are based on several components indicated by packet data, including their:

· Source.

· Content.

· Destination.

These properties may be expressed differently at different levels of the network. As a packet travels over the network, it is reformatted multiple times to inform the protocol where to send it. At different networks levels, there are different types of firewalls too.

Some firewall types 

  • Packet-filtering firewalls.
  • Proxy firewalls.
  • Web application firewalls.
  • NAT firewalls.
  • Virtual firewalls.
  • Next-gen firewalls (NGFW).

Packet-filtering firewalls

These firewalls have programs that can block network traffic, an IP address, IP protocol, and a port number. This is the most primary form of protection and also the smaller network.

But be careful. While packet-filtering firewalls can be effective, they also have limitations, like a packet-filtering firewall doesn’t block web-based attacks. 

Packet filtering firewalls
Image : Huawei

Proxy service firewalls

This is known as a gateway firewall. Through filtering messages at the application layer, it can protect your network security. It typically serves as a middleman or gateway between your internal network and outside servers on the web. 

Web application firewalls

Web application firewalls (WAF) are effective for filtering, blocking and monitoring data packets as they move in and out of web applications or websites. WAFs are available as server plugins, cloud services, or network appliances.

Network address translation (NAT)firewalls

A NAT firewall can analyze internet traffic and restrict unwanted conversations. In other words, it only allows inbound web traffic if it is requested by a device on your private network.

Virtual firewalls

In a cloud-based system, whether private or public, a virtual firewall is an appliance that protects data. This sort of firewall is used to analyze and control the internet’s traffic flow for both physical and virtual network traffic.

Next-generation firewalls (NGFW)

Compared to packet-filtering and stateful inspection firewalls, the next-generation firewalls are far more complex and capable. Why? In addition to normal packet-filtering, they may inspect a packet’s whole. Not only must the packet header be checked, but also the packet’s contents and source. As security threats become more sophisticated and dynamic, NGFWs can keep up with them.

Main risks of not having a firewall

Open access

If you work without a firewall, you must accept all connections into your network from anyone. You won’t be able to detect incoming threats. It causes to leave your devices vulnerable to malicious users.

Lost or compromised data

Your devices may be exposed if not left having a firewall or allowing someone to control your computer or network. Cybercriminals may delete data, or they may use identity theft or financial fraud.

Network crashes

 Attackers may shut down your network if not use a firewall. To get it running again, and to recover your stored data, will spend your time and money.

Firewalls are a vital part of security technology, especially if you work with different types of firewalls together; it will be an umbrella of protection. Firewalls maintain your network, computer, and data safe and secure.

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