1. What is a firewall, and where is a firewall installed? 2. What is a digital certificate? 3. Many commercial firewall products allow a manager to specify packets to deny as well as packets to...

1. What is a firewall, and where is a firewall installed?

2. What is a digital certificate?

3. Many commercial firewall products allow a manager to specify packets to deny as well as packets to accept. What is the disadvantage of a configuration that allows denial?

4. Read about commercial IDS systems, and make a list of attacks the systems can detect.