Firewalls are basically customizable which means that you can either add or remove filters based on your existing conditions. Here are some terms that you need to be familiar with when dealing with firewalls:
• IP (Internet Protocol) addresses – unique address assigned to a network machine, usually in the format 255.255.255.255
• Domain names – there are the human readable equivalent of the IP addresses, each IP address corresponds to a certain domain name
• Protocols – this are the communication services that are used in a network or Internet connection which includes IP, TCP, HTTP, FTP, UDP, ICMP, SMTP, SNMP and Telnet
• Ports – numbered ports serve as the entry point for different services running on the network or the Internet
• Specific phrases and words – this allows the firewall application to look for specific catch words or phrases to block

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