एक स्कूल छात्रों को फाइनेंस सर्वर तक पहुँचने से रोकता है जबकि लेखाकारों को इसकी अनुमति देता है। यह किसे प्रदर्शित करता है?

Firewalls are used to protect a communication network system against ________.

Which of the following is NOT a fundamental property of secure communication?

Which of the following protocols is commonly used for providing security and privacy to e-mail messages?