The primary function of $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ is to turn an unreliable network into a reliable network that is free from lost and duplicate packets.

$[$ Choose $]$ subnet masking extranet Address Resolution Protocol $($ARP$)$ Dynamic Host Configuration Protocol $($DHCP$)$ Internet Protocol $($IP$)$ sliding$-$window size packet Telnet Transmission Control Protocol $($TCP$)$ Network Address Translation $($NAT$)$