- menapis in / out dlm network
- pengawal traffic (allow & block)
- bukan antivirus
- cth firewall (COMODO -> rules allow + block)
- utk kawal in & out bound yg berlaku dlm network card
- control sebarang komunikasi atr pc dgn pc yg lain / host lain drpd network card.
- hanya menggunakan rules
- 1. allow + deny
- 2. accept + firewall
- 3. allow + block
- 1. allow + deny
* Setiap komunikasi yang berlaku menggunakan IP + Port
Port
80 - http
8080 - proxy
21 - ftp
53 - DNS
110 - POPS
22 - ssh (hacker selalu guna)
20 - telnet
* Reason guna firewall Staff & student :
- tidak benarkan mana-mana pihak boleh control server
- Kalau student & staf boleh control server maka tiada fungsi Chief Network Server
A firewall is a dedicated appliance, or software running on another computer, which inspects network traffic passing through it, and denies or permits passage based on a set of rules.
Reference - http://en.wikipedia.org/wiki/Firewall
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