What is the first name in an email address called?

The work done on the Internet is called -

Which of the following is the most difficult and secure device that LAN uses?

The company has a large network which is divided into smaller parts. By using which device LAN can be divided into different parts?

Which subnet is used for LAN security to bring stability in the Internet network?

What is the name of those viruses which fool a user into downloading or executing them by pretending to be useful applications?

The virus that spreads in application software is called -

How does Le-Hard Virus come into existence?