Firewalls ... ... ... ...

Thanks ALLAh because today I was given a long life so that I can still follow the lecture. Although I remain a big wake study because today I have the fun, especially if the computer is not enough security lhoooooooooo.
Day discusses the firewall ... ... ..

My first question is does appear FIREWALL is important and I do ... ... ... ... ... ...? Suddenly I dosenku surprised when we start the lesson today ... ... ... ... ... so do not pile dech ... ... ... ... ... .. he .. he ... he ... ... .. ...

Firewall is a device used to ensure the security of a connection. Device here can be a software or hardware. It works the flow of data will be checked by the firewall will then be compared with the existing rules. Firewalls can only check the data over.

There are 4 types of firewalls, among others:
1. Packet filtering firewall
work on layer 3 (network layer). A network protocol layer IP (internet protocol) to make a filter based on IP Address (IP source, destination, protocol, port)

2. Sock Proxy
work on layer 4 (transport layer) at the transport layer protocol are TCP / UDP. In menfilter based transportnya or bring.

3. APPLICATION Proxy
work on layer 1 (application layer) drawbacks are the applications built with the view that the application is there, so if there is a new application may not necessarily diblog.

4. MIXED

This lesson is finished hopefully useful ... ... ... ..