A multilayer firewall is another type of firewall, and it is considered a sophisticated and robust security framework since it comprises several firewalls of which deal with a specific issue (Morgan, 2017). Multilayer firewall is not very popular among most of the organizations since they are considered expensive and sometimes could be useless in some organizations that only want one type of firewall. This type of firewall deals with a wide array of security issues and helps an organization to have a firewall that deals with all security issues the organization is facing (Cooper & Guzik, 2014). This means that it deals with data traffic, network security, among many other areas to ensure that the company’s data remain confidential. However, it is one of the best firewalls that any organization can use to avoid having several firewalls configured to its system (Cooper & Guzik, 2014). Instead of an organization implementing more than two firewalls to serve different purposes, the organizations should adopt a multilayer firewall since it is capable of dealing with all the security issues. Additionally, the use of multilayer firewalls makes it hard for hackers to breach the organization’s network since penetrating the multilayers is a real uphill task.
A hybrid firewall combines two or more of the above types of firewalls. Many of the firewalls on the market are a combination of packet-based firewall and application-gateway firewall (Kenworthy, 2014).
Through connections of networks, there is a different level of faith that usually exists on the connection’s sides. This term, “Trust,” means that the group does believe equally of the users on its computers and the software being non-malicious (Pinter, 2015). Firewall technology offers vital protection from hackers, as discussed below;
The operating systems do have a past of ensuring configurations. To give an example, Windows 98 and Windows 95 distributed extensively with window file distribution that was default enabled; so many viruses exploited this vulnerability. Another example is Red Hat Linux Versions 7.0, as well as 6.0, who were exposed to the three remote exploits when the default options were used in installing the operating system (Dodis & Stephens-Davidowitz, 2016). It is an expensive and on-going process for every user’s machine to be secured; this has made several organizations consciously craft a verdict not to protect the machines within their firewalls. In case a machine is ever compromised from the inside, the vulnerability of the other machines is possible. This situation is commonly referred to as “a sort of crunchy shell around a soft, chewy center.” A sole machine, which is connected to the internet, can be protected using a private firewall instead of working on securing the operating system (Kenworthy, 2014). These firewalls bar some communication types.
The nationwide firewalls do limits on the internet the actions of their users, for instance, in China. Children’s Internet Protection Act (CHIPA) is the same idea in the US, which mandates the information to be filtered (Kenworthy, 2014). The schools and libraries that are funded by federal are required by this law to block some specific contents of the web.
Since all traffic from a network has to bypass through firewall information, it is, therefore, possible to achieve leaks reduction in the organization’s data (Salah et al., 2016). Prevention of any unauthorized leak of data to the outsiders is the key criterion for the success of digital corporate gateways.
Firewalls are components of the overall policy of security; they usually impose the rules concerning which traffic network is acceptable to leave or enter the network (Cooper & Guzik, 2014). These policies limit which remote machine may be contacted, the use of specific applications, and also a limitation of the bandwidth.
In case a security breach occurs, the audit trials may be used to assist in determining what had happened and what caused the breach (Salah et al., 2016). The audit trails have been widely used in the monitoring of employees in many organizations.
A significant security issue that faces a private network from the internet is the spam mail sent from hackers to enable them to gain access to it. A spam mail is used by the hackers to a legitimate email address to lure them into opening them. Hackers use spam mails to launch malware to a network (Dodis & Stephens-Davidowitz, 2016). Such malware is embedded in such emails and becomes activated when the mail is open. Hackers then use that malware as the window to gain access to the network. A firewall is therefore used to block such emails from gaining access to a private network.
Firewalls use various protocols. The firewall protocols refer to the rules that govern the transfer of data from the source to the destination host—firewall work between the internet and a private network. Therefore, the firewalls are governed by the TCP/IP protocols (Salah et al., 2016). These protocols are used to determine how data is coded and how the firewall is configured. These protocols are typically used to establish rules that govern the regulations set by the network administrator (Cooper & Guzik, 2014). These rules are written and stored in the gateway router. These rules specify which ports are to be accessible and which IP addresses. The following are the protocols that are implemented to govern the functionality of firewalls: