Which two of the following types of SMS gateways can be configured in Cisco ISE to communicate with guest users via SMS text messages?

The correct choice is the type of SMS gateway that allows Cisco Identity Services Engine (ISE) to send SMS text messages to guest users. Third-party SMS gateways are specifically designed to handle the sending and receiving of text messages. Cisco ISE can be integrated with various third-party services that facilitate communication through SMS by using APIs or other communication protocols.

This integration is essential in guest access scenarios, where guests may need to receive credentials or access information via text message. Using a third-party SMS gateway leverages the specialized capabilities of these services, ensuring reliable and efficient message delivery.

The other options, while relevant in terms of data transfer and communication, do not serve the purpose of SMS text messaging in the context of Cisco ISE. FTP, SMTP, and SFTP are protocols widely used for file transfer and email communication but do not provide the functionality required for SMS messaging. Thus, configuring a third-party SMS gateway is the appropriate approach for enabling SMS notifications to guest users in Cisco ISE.