Firewall :- Defined, Explained, and Explored
What is Firewall?
A firewall is software which blocks unauthorised access from a private network. It is designed with set of rules which allows it to filter wide range of data packets which are present on the internet. It inspect each individual packets at both sides of firewall i.e, the packets going from the user’s end and packets from being received by the user. It prevents user from attackers or illicit software getting access to the system. A firewall can be hardware, software or a combination of both.
There are two main types of firewalls, one is network based firewall and the other is host based firewall. A network based firewall can be used in cloud based structures where it acts as a virtual firewall and provides security for the network. Whereas, a host based firewall is present on servers which effectively monitors the outgoing and incoming signals.
What Firewalls Do?
Firewall enhance the security of the systems connected to the internet, it is usually the first line of defense in protection from online threats. A firewall validates the access given to the data packets on the internet to the user’s network. It also defends user’s resources blocking the external forces getting access to the system. It also manages and control network traffic and provide smooth flow of data over the internet. The set of rules in the firewall define if the packets are harmful or harmful and accordingly it notify the user or raise a flag by reporting an malicious activity. Firewall also works as an intermediate between the user’s system and the internet.
Why should we use Firewall?
Firewall is one of the most important aspects of user’s computers security. It provides protection to the system as it,
Prevents from remote access : Firewalls can be very helpful in protecting the system from programs which allow remote access. With remote access hackers can view or get access to the personal files, folders present in the system and in some cases they can lock out the user from the system.
Prevents Backdoor entry of bugs: Online space is filled with various virus, malwares and other threats. Firewall blocks the backdoor entry of malicious programs and keeps the system safe.
Prevents from SMTP hack : Firewall restricts the access of hacker who can use the user’s IP address to send phishing emails. SMTP is used to send emails and hackers can use the user’s system to redirect their spam mails through the user’s SMTP server which will make them untraceable.
Prevents from operating system bugs : Firewall blocks the backdoor entry of operating system bugs into the system. Hackers can take advantage of the system’s vulnerability and can install an malicious program into the system.
Prevents from DoS(Denial of Service) and DDoS(Distributed Denial of Service) attacks: Firewall is very effective in case of any attempts of DoS or DDoS attacks. Here, attackers send a request to connect with the server. When the server responds and tries to start a session, it cannot find the system from where it received the request.
Prevents from e-mail bombs : Firewalls can block the email attacks by the hackers. In an email bomb, hackers send the same email multiple times until the email system gets crashed
The other benefits of firewall involve protection from Macros, virus, malware, spam and source routing.
For protection against online threats, firewall is one of the most effective solutions. It provides safe and secure online space for the users.
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