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Firewalls, to me, are the most important aspect for modern network security. The firewall is a combination of software and hardware components that controls the traffic that flows between a secure network and an insecure network (usually the Internet), using rules defined by the system administrator. The firewall sits at the gateway of a network or sits at a connection between the two networks. All traffic, from one network to the other, passes through the firewall (Thakur, 2018). 

Having the proper firewall in place can mean the difference between a secure network and a non secure network. Proper maintenance of that network is also crucial to security remaining intact for your network. The firewall has to be configured for the type of traffic that your company uses on a daily basis otherwise no traffic will be allowed through that is necessary for business operations. 

Thakur, D. (2018). FIREWALL: explain types of firewall architectures. Retrieved from http://ecomputernotes.com/computernetworkingnotes/security/types-of-firewall-architectures