FTP and Telnet are considered OSI layer 7 protocols. If you are blocking the service, then layer 3 or 4 (network or transport) is responsible.
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to prevent hacking is easy, all you need to do is just don't download of sites that haven't got a lock or green symbol on it.
you can't prevent disasters because no one can, the only thing is you must always be prepared.
High safety measures at the nuclear plants is to be observed if the nuclear disasters is to be prevented. The problems identified at the nuclear plant should be immediately rectified to prevent the nuclear disasters.
no we cannot prevent disasters but if we listen to the TV and radio and move to another place
it is vulnerable to disasters like twisters without mountains to prevent such disasters from happening
It tries to prevent hacking with jailbreak.
Through anti-virus or anti-hacking program. But they are not enough you have to beware of phishing and some other tricks.
Most likely but I am quite sure that they are advancing their technology to prevent future disasters.
Antiviral software programs should prevent most hacking, but not 100%. It is possible that a hacker can get past antiviral software through security holes.
Ultraviolet rays are blocked. It helps prevent radiations enter our eyes.
Ultraviolet rays are blocked. It helps prevent radiations enter our eyes.