What firewall action must be implemented in a guest pre-authentication role to show the captive portal login screen?

What firewall action must be implemented in a guest pre-authentication role to show the captive portal login screen?

• A. ALLOW
• B. Deny
• C. DST-NAT
• D. DROP

Answer: (C)

In the context of managing guest access to a wireless network, particularly regarding the use of a captive portal, the appropriate firewall action is to utilize Destination Network Address Translation (DST-NAT). This action plays a crucial role in redirecting guest users to the captive portal login screen. When a device connects to the network and attempts to access the internet without being authenticated, the firewall uses DST-NAT to intercept and redirect the initial web traffic from the guest device to the captive portal. This ensures that any requests to a web page are effectively rerouted to the login page, thus prompting the user to authenticate before being granted broader access to the network. Using the ALLOW action would permit traffic without requiring users to go through the authentication process, which defeats the purpose of having a secured guest access mechanism. On the other hand, DENY and DROP actions would block access entirely, preventing the redirection to the captive portal and thus leaving the guest user unable to authenticate at all. In summary, implementing the DST-NAT action in a guest pre-authentication role is essential for successfully displaying the captive portal login screen, allowing users to authenticate before they are granted full access to network resources.

In the context of managing guest access to a wireless network, particularly regarding the use of a captive portal, the appropriate firewall action is to utilize Destination Network Address Translation (DST-NAT). This action plays a crucial role in redirecting guest users to the captive portal login screen.

When a device connects to the network and attempts to access the internet without being authenticated, the firewall uses DST-NAT to intercept and redirect the initial web traffic from the guest device to the captive portal. This ensures that any requests to a web page are effectively rerouted to the login page, thus prompting the user to authenticate before being granted broader access to the network.

Using the ALLOW action would permit traffic without requiring users to go through the authentication process, which defeats the purpose of having a secured guest access mechanism. On the other hand, DENY and DROP actions would block access entirely, preventing the redirection to the captive portal and thus leaving the guest user unable to authenticate at all.

In summary, implementing the DST-NAT action in a guest pre-authentication role is essential for successfully displaying the captive portal login screen, allowing users to authenticate before they are granted full access to network resources.