If a device is determined to have an out-of-date virus signature file, then network access control (nac) can redirect that device to a network by

a. a trojan horse
b. tcp/ip hijacking
c. address resolution protocol (arp) poisioning
d. dhcp man-in-the-middle

C. Address Resolution Protocol (ARP) poisoning.

Explanation:

An antivirus signature file is a program written to describe and remedy a group of identified malware attacks, to prevent future attacks from the described malicious softwares. It is constantly updated to identify more malicious softwares.

A network access protocol (NAC) is used to implement access control on a network, collaborating with other protocols like ARP and unifying antiviruses, intrusion detection and vulnerability assessment.

When the virus signature file is out of date, the NAC allows a new malware, the antivirus can not identify, to access the network through ARP poisoning.

answer ingress;