which page should you configure the settings?

HOTSPOT
You create a SharePoint site for collaboration with external partners. The network team configures
the reverse proxy server and publishes the SharePoint site.
Partners cannot sign in to the SharePoint site.
You need to ensure that partners can access the SharePoint site.
In Central Administration, on which page should you configure the settings? (To answer, select the
appropriate page in the answer area.)

Answer:

Explanation:
Note:
* Reverse proxy server A reverse proxy server that supports Secure Sockets Layer (SSL), such as
Microsoft Forefront Unified Access Gateway (UAG), enables you to publish SharePoint sites across
the corporate firewall.
* See step 2 below:
After the SharePoint site is published outside the firewall, you must add the site to a zone that
allows for cross-firewall access. A cross-firewall access zone is used to generate external PC and
mobile URLs in mobile alert messages, and enables users to send an externally available URL when
they click the E-mail a link or Alert Me button on the ribbon.
To configure a cross-firewall access zone
Verify that you have the following administrative credentials:
You must be a member of the Farm Administrators group.
In Central Administration, click System Settings.
On the System Settings page, under Farm Management, click Configure cross firewall access zone.
On the Cross Firewall Access Zone page, in Web Application, in the Web Application list, select the
web application that is published across the firewall.
In Cross Firewall Access Zone, in the Zone selection for cross firewall access list, select the zone that
is published across the firewall.
Configure external access for mobile devices in SharePoint 2013