Lenita is a network technician. She is setting up a ruleset for a firewall in her company's demilitarized zone (DMZ). For email, she creates an allow-exception rule permitting Simple Mail Transfer Protocol (SMTP) traffic on port 25 to leave the internal network for the Internet. Her supervisor examines Lenita's work and points out a possible problem. What is it

What is domain name system (dns)? allows dynamic ip address allocation so users do not have to have a preconfigured ip address to use the network converts ip addresses into domains, or identifying labels that use a variety of recognizable naming conventions the efficient coexistence of telephone, video, and data communication within a single network, offering convenience and flexibility not possible with separate infrastructures the integration of communication channels into a single service