A Citrix Engineer has received the following message after setting up Application Firewall in Learning mode.
August 28 6 03:14:27 <local0.info>XXX.0.0.2.08/28/2017:03:14:27 GMT VPXExtProd01 0-PPE-0:
default GUI CMD_EXECUTED 1670370 0: User CitrixAdmin- Remote_ip XXX.19.XXX.XXX-Command
"show appfwlearningdata WebPub_vs_af_1 startURL"- Status "ERROR: Communication error with aslearn" What can the engineer perform to resolve the issue?

Which reason can cause fail over in a Citrix ADC Application Delivery Management High Availability pair?

Scenario: A Citrix Engineer wants to protect a web application using Citrix Web App Firewall. After the Web App Firewall policy afweb_protect is bound to the virtual server, the engineer notices that Citrix Web App Firewall is NOT properly displaying the page.
A positive number for the Policy Hits counter for afweb_protect, tells the engineer the number of times Citrix Web App Firewall__________. (Choose the correct option to complete the sentence.)

Which two actions can a Citrix Engineer use to provide Denial of Service (DoS) protection with the AppQoE feature? (Choose two.)

Scenario: A Citrix Engineer wants to configure the Citrix ADC for OAuth authentication. The engineer uploads the required certificates, configure the actions, and creates all the necessary policies. After binding the authentication policy to the application, the engineer is unable to authenticate.
What is the most likely cause of this failure?