Which of the following Cisco platforms support AsyncOS APIs? (Choose three.)

A. WSA

B. Nexus

C. ESA

D. IOS XR

E. IOS XE

F. SMA

Explanation:
The Cisco Email Security Appliance (ESA), the Cisco Web Security Appliance (WSA), and the Cisco Content Security Management Appliance (SMA) all support AsyncOS Application Programming Interfaces (APIs). APIs allow two applications to communicate. For example, you can use an API to allow one application to query and retrieve data from another application.

Cisco ESA is designed to protect against email threats, such as malware attachments, phishing scams, and spam. Cisco WSA is a web gateway that is designed to mitigate web-based attacks, enforce acceptable use policies, and provide detailed reporting features. Cisco SMA provides centralized management and reporting for multiple Cisco ESA and WSA devices.

IOS XE platforms, such as the Cisco CSR 1000V, the Cisco ASR 1000, and the Cisco Catalyst 3850, support NETCONF and RESTCONF. NETCONF is an Internet Engineering Task Force (IETF) standard protocol that communicates by using either Secure Shell (SSH) or Transport Layer Security (TLS). RESTCONF is an alternative to NETCONF that is intended to provide an environment that is more like a Representational State Transfer (REST) API.

IOS XR platforms, such as the Cisco ASR 9000, support gRPC Remote Procedure Call (gRPC) APIs. IOS XR platforms also support NETCONF and RESTCONF.

Cisco Nexus switches support NX-API CLI and NX-API REST APIs. Nexus switches also support NETCONF.