Which of the following hardware devices links multiple networks and directs traffic between networks?

You are the network administrator for a small organization. Recently, you contracted with an ISP to connect your organization's network to the internet to provide users with internet access. Since doing so, it has come to your attention that an intruder has invaded your network from the internet on three separate occasions. What type of network hardware should you implement to prevent this from happening again?

Which of the following is the best device to deploy if you want to protect your private network from a public untrusted network?

Which of the following is a good reason to install a firewall?

You are the administrator of your company's network. You want to prevent unauthorized access to your intranet from the internet. Which of the following should you implement?