Which type of firewall filters traffic between different parts of a site's network?

• A. Border
• B. Internal
• C. Intermediate
• D. None of the above

Answer: (B)

Internal firewalls sit inside the network to police traffic moving between different internal segments, such as between subnets, VLANs, or between servers and users. This placement enforces segmentation, limiting how openly one part of the network can talk to another and helping contain breaches by blocking unnecessary or risky paths.

A border firewall, by contrast, sits at the network edge and controls traffic between the internal network and the Internet, not between internal parts. The term intermediate isn’t a standard designation for a firewall role, and “none of the above” wouldn’t apply since an internal firewall is specifically used for filtering internal traffic between network segments.