Firewall hardware

Keyword Name:Firewall hardware
AVG CPC:$7.01

Abount Firewall hardware
[edit] Hardware Firewalls
The computer's Hardware resources are essentially: the processor, the RAM, and the hard disk. Virtual memory is the content of RAM that is temporarily written onto the hard disk in order to free the RAM chips to hold other content or to supply other data for mathematical processing. For this reason, the virtual memory is open to internet attack just as the RAM is.

Since several ports of a computer need to be open at various times in order for applications to be allowed to bring data in to the user and send it out from the user, (applications such as internet browsers (http - hyper-text transfer protocol) , e-mail programs (smtp - simple mail transfer protocol) and FTP programs (ftp - file transfer protocol) ), most types of Firewalls are necessarily unable to stop the flow of unwanted content via the ports that they have been configured to allow.

Hardware Firewalls are connected to the computer where the phone-line modem or cable modem allows data into the computer and out of the computer. They are external Hardware. They can be configured such that only data bound for designated ports (virtual ways in/out of the computer) are routed to the OS services. A port is essentially only an abstract address since the true data pathway is the cable itself and the modem's jack. Ports are authorizations (in the OS) of data flow to the OS. The Hardware Firewall's function is, therefore, to filter out data coming from restricted origins and thus keep it from accessing the Operating System's services. The net result is that only data bound for ports which were set by the user to be open (in the Firewall's configuration) will always be passed on to the OS services, and to the computer's Hardware resources.


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