Routers are often used to implement FIREWALLS

You are adding a new server to your network. The network uses TCP/IP. The new server will provide users with dial-up access to network resources. The data link communications protocol you choose for dial-up access must allow you to provide secure authentication. Which protocol should you choose?

Maria needs to install software on a Windows NT Server computer which is a backup domain controller. When she attempts to log on to the server, she receives the message "Unable to log on locally". What must you do to enable Maria to log on to the server?

Why does a high number of broadcast messages adversely affect overall network performance?

You want to find out which users are currently using a specific directory on a Windows NT Server computer. How should you do this?