This is a true statement. Firewalls can either be a software program installed on a computer either as part of the operating system, or as a separate utility. Firewalls can also be a physical piece of equipment that is installed between the internal network and the Internet.
Firewalls are not an effective barrier against phishing attacks. A phishing attack involves tricking someone into divulging information, and a firewall cannot help prevent someone from releasing private information. A firewall's purpose is to prevent unauthorized access to the company internal network.
This is the very basic definition of a firewall.
This is a true statement. Port scans would be unable to reach the computers on the company's network through the firewall.
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