EXPLAIN THE UNDERSTANDING AND TYPE OF FIREWALL

Firewall

Talking about internet security certainly not independent of the firewall, the firewall is one that is highly and can not be ignored. But many of us who still do not understand what it is and what the use of the firewall the firewall. Firewalls can be called "GATEKEEPER" or guard the gate that protects the Internet connection of a computer network laiinya of intrusion or intruders, the firewall also generally used to control access to anyone who has access to a private network from outside parties, the term firewall becomes a generic term that refers on a system that manages the communication between two different networks. Given today many who have access to the Internet, then the protection of digital data against hacker attacks, espionage offenders, thieves or other data, becomes essential.

Understanding Firewall
A firewall is a software system that allows network traffic that is considered safe to get through and prevent network traffic that are considered unsafe. Generally, a firewall is implemented in a dedicated machine, which runs on the gateway (GATEWAY) between the local network to the Internet network. A firewall is a security device can be a software program or a network device (hardware) specifically. The main purpose of a firewall is to separate the secure area of ​​the region less secure, and to control the communication between the two. Firewalls can perform various other functions, but it is mainly responsible for controlling inbound and outbound communication from one computer to the entire network

Function Firewall

1. Control and supervise the data packets flowing through a network
2. Perform authentication of access
3. Record every transaction events that occur in the firewall 
4. Activity block suspicious network data flow

Type Firewall

1. Packet Filtering Gateway
2. Application Layer Gateway
3. Circuit Level Gateway
4. Statefull Multilayer Inspection Firewall