Free Cisco 300-820 Practice Test & Real Exam Questions

After enabling Media Optimization for Webex Calling, a company begins experiencing intermittent one-way audio on calls between Webex App users and PSTN endpoints. Internal calls between Webex users work normally, and SIP signaling completes successfully without errors. Call flow traces show that the Webex App attempts to create a direct media path to the Local Gateway, but the negotiation frequently fails, which causes an inconsistent fallback to relay media. This behavior mirrors the audio issues reported by users. Which area must be examined first to help identify the root cause of the one-way audio?

What is a capability of the Identity Service within the Webex Security Realm architecture for authentication?

The _____ is a logical group within the Local Zone that all endpoints register to by default.

Refer to the exhibit. A company has a Cisco collaboration infrastructure that contains Cisco UCM and Cisco Expressway-C and Expressway-E for Mobile and Remote Access. When the engineer sets up the environment to support B2B calling, they discover that the zone stale between Expressway-C and Cisco UCM failed. What must the STEP Trunk Security Profile setting be changed to in Cisco UCM to resolve the issue?

An administrator made changes to a directory connector for Webex AD synchronization. The number of users synchronized is quite large and the change should affect only a limited number of users. How can the administrator check the result before executing the synchronization?

An engineer must review a new traversal zone that is not establishing a successful connection between Expressway-C and Expressway-E. When the event log page on the Expressway-E is reviewed, an authentication failure is found with the detail "user not found". Which two actions must the engineer take to resolve the issue? (Choose two.)

While troubleshooting a connectivity issue between Cisco Unified Communications Manager, Expressway-C, and Expressway-E, an engineer sees this output in the Expressway-E logs.
Event="Authentication Failed" Service="SIP" Src-ip="10.50.2.1" Src-port="25723" Detail="Incorrect authentication credential for user" Protocol "TLS" Method="OPTIONS" Level="1" What is the cause of this issue?

Which configuration is required when implementing Mobile and Remote Access on Cisco Expressway?

An administrator recently changed the organization-level external communication setting from
"Allow external communication" to "Block external communication." A user reports that external partners in an existing Webex App space still can view and communicate within the space. Which action must the administrator take to ensure that external communication is immediately and effectively blocked for all existing Webex App spaces?

An engineer is deploying an Expressway solution for the SIP domain Cisco.com.
Which SRV record should be configured in the public DNS to support inbound B2B calls?

Which dial plan component is configured in Expressway-C to route a call to the Cisco UCM?