A packet filtering firewall can
- A. Deny certain users from accessing a service
- B. Block worms and viruses from entering the network
- C. Disallow some files from being accessed through FTP
- D. Block some hosts from accessing the network
Answer: D. Block some hosts from accessing the network
Explanation: Packet filters work on IP addresses and ports, so they can block hosts. They cannot inspect payloads effectively for viruses or specific file names.