What is a prerequisite for allowing DHCP traffic to a user on Deep Security?

To enable DHCP traffic for a user in Trend Micro Deep Security, employing Force Allow rules appropriately is essential. Force Allow rules are specifically designed to facilitate traffic that would otherwise be blocked by standard security policies. DHCP, which relies on both UDP and specific ports (UDP/67 for DHCP server and UDP/68 for DHCP client), needs special consideration because it operates differently from typical TCP traffic.

By using Force Allow rules, administrators can ensure that DHCP requests are permitted through the security measures in place, while still retaining the overall security posture provided by the system. This approach allows for the necessary functions of DHCP to operate seamlessly without exposing the system to unnecessary vulnerabilities, as it aligns with the need to selectively allow certain types of traffic without compromising security.

The other options do not adequately address the requirements for managing DHCP traffic effectively within Deep Security's framework. For instance, solely relying on Allow rules may not be sufficient to handle the specific needs of DHCP, while disabling all other traffic would disrupt network functionality, including essential services. Similarly, restricting traffic to only TCP would ignore the UDP protocol utilized by DHCP, making it impossible for IP addresses to be assigned to users correctly.