Cisco 300-820 Practice Exams
Last updated on Oct 21,2026- Exam Code: 300-820
- Exam Name: Implementing Cisco Collaboration Cloud and Edge Solutions (CLCEI)
- Certification Provider: Cisco
- Latest update: Oct 21,2026
An administrator configures a secure SIP trunk in Cisco UCM to Expressway-C. The SIP trunk fails to become active, and an examination of a packet capture finds that the TLS handshake failed with a “Certificate Unknown” error from Cisco UCM. To allow the Cisco UCM to trust the Expressway-C and establish a TLS connection, the administrator will upload the Expressway server certificate to the trust store.
To which trust store must the certificate be uploaded?
- A . tomcat-trust
- B . CallManager-trust
- C . TVS-trust
- D . ipsec-trust
When determining why Mobile and Remote Access to Cisco TelePresence equipment does not work anymore for an organization. There are several administrators and configuration changes could have happened without anyone knowing. Internal communication seems to be working, but no external system can register or call anywhere. Gathering symptoms, you also discover that no internal systems can call out either.
What is TraversalZone missing that causes this issue?
- A . link to the DefaultZone
- B . pipe to the DefaultZone
- C . SIP trunk to the DefaultZone
- D . route pattern to the DefaultZone
When an Expressway-E is configured for static NAT, which Session Description Protocol attribute is modified to reflect the NAT address?
- A . SDP b-line
- B . SIP record route
- C . SDP c-line
- D . SDP m-line
During the deployment of a Cisco Webex Video Mesh, where do on-premises SIP endpoints send signaling?
- A . On-premises endpoints cannot participate in Cisco Webex Video Mesh
- B . to the cloud
- C . to the switching services
- D . to the call control environment (Uni ed CM or Expressway)
A company has a single Expressway-E that exhibits high resource utilization. An engineer checks the logs and finds numerous fraudulent attempts from sip: [email protected].
Where must the engineer go to configure a call policy rule and block the desired URI?
- A . Call History Configuration > Call Policy > Rules
- B . Configuration > Call History > Policy > Rules
- C . Configuration > Call Policy > Rules
- D . Configuration > Policy > Inbound > Rules
An engineer wants to configure a zone on the Expressway-E to receive communications from the Expressway-C in order to allow inbound and outbound calls.
How is the peer address configured on the Expressway-C when Expressway-E has only one NIC enabled and is using static NAT mode?
- A . Expressway-E DHCP
- B . Cisco UCM FQDN
- C . Cisco UCM DHCP
- D . Expressway-E FQDN
D
Explanation:
Reference: https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/expressway/cong_guide/X8-11/Cisco-Expressway-Basic-Configuration-Deployment-Guide-X8-11-4.pdf
Which describes what could done on the Expressway-E to successfully route calls from Expressway-C on the internal network to the Internet?
- A . Application layer gateway could be enabled to bridge the media traffic.
- B . A static NAT route could be added to the firewall to bridge the two networks.
- C . The Expressway-E could be enabled for Dual-NIC capability.
- D . The Expressway-E could be enabled for interworking.
Cisco Collaboration endpoints are exchanging encrypted signaling messages.
What is one major complication in implementing NAT ALG for voice and video devices?
- A . Internal endpoints cannot use addresses from the private address space.
- B . The NAT ALG cannot inspect the contents of encrypted signaling messages.
- C . NAT ALG introduces jitter in the voice path.
- D . Source addresses cannot provide the destination addresses that remote endpoints should use for return packets.
Where are voice calls handled in a Cisco Jabber hybrid cloud-based deployment with Cisco Webex Platform Service?
- A . Voice calls use Webex Calling platform for call control and use hybrid media nodes for local conferencing.
- B . Voice calls use local media nodes to keep traffic internal for internal traffic and use Webex Calling for external calls.
- C . Voice call use Cisco Unified Communications Manager for local calls and Webex Calling for external calls.
- D . Voice calls use local Cisco Unified Communications Manager for all calls.
For a Mobile and Remote Access deployment, which server’s certificate must include the Unified registration domain as a Subject Alternate Name?
- A . Expressway-C server certificate
- B . Cisco Unified Communications Manager server certificate
- C . Expressway-E server certificate
- D . Expressway-C and Expressway-E server certificate