Key Terms

Review the following list of key terms:

• DMZ— An intermediate space inhabited by Internet servers that falls behind a front firewall and in front of a more restrictive firewall protecting an internal network.

• firewall— A device or application that restricts network access to an internal network.

• packet filter— A firewall that filters by port number or other protocol information indicating the purpose of the packet.

• proxy server— A computer or application that requests services on behalf of a client.

• reverse proxy— A computer or application that receives inbound requests from the Internet and forwards them to an internal server.

• stateful firewall— A firewall that is aware of the state of the connection.