Cisco CLCEI 300-820 study plan

Diagram the full Cisco collaboration deployment stack (on-premises Unified CM, Webex cloud, Expressway-E/Expressway-C pair, and connectors) from memory and label every trust boundary

Compare Webex cloud-only, hybrid, and on-premises call-control models and list at least three decision criteria that drive each choice for a mid-size enterprise

Explain how Expressway-C and Expressway-E traverse a firewall using outbound TLS and describe which side initiates each connection

Map each exam domain to the architecture components it touches so later weeks have a reference diagram

Configure an Expressway-C and Expressway-E traversal pair in a lab or simulator, including zones, neighbor zones, and traversal zones

Enumerate the DNS records required for hybrid services (A/AAAA, SRV, CNAME for the various service prefixes) and explain what breaks when each is missing

Describe certificate requirements on Expressway-E, including CA-signed certificates, SANs, and the trust chain toward Webex and Unified CM

Troubleshoot a simulated failed traversal call by reading zone status and search history rules

Explain how Unified CM Cloud (Webex Calling-dedicated or UCM Cloud) and hybrid call routing differ from on-premises route patterns and translation patterns

Trace a call from an on-premises phone to a Webex cloud-registered endpoint and list each hop, including SIP normalization and dial plan translation

Configure a lab dial plan that routes a specific number range to the cloud and document the digit-manipulation steps

Compare message routing options (Webex Teams/App messaging, hybrid message service) and their prerequisites

Navigate Webex Control Hub to create and organize users, assign licenses, and explain the difference between calling, meetings, and messaging entitlements

Describe how organizations, sites, and locations structure a Webex deployment and how that maps to PSTN connectivity choices

Perform a license audit exercise: given a hypothetical 500-user org, allocate the correct license mix and justify it

Explain role-based access in Control Hub (full admin, read-only, support, custom roles) and when to use each

Describe the components of Hybrid Calendar Service (Expressway connector, calendar connector, Exchange/Office 365 integration) and the direction of each connection

Configure a lab or simulated calendar connector and explain the service account permissions required in Exchange and Exchange Online

Explain how Hybrid Directory (Active Directory connector) syncs users and which attributes matter for collaboration identity

Troubleshoot a calendar sync failure by distinguishing connector, permission, and DNS causes

Explain directory synchronization topology options (single connector, redundant connectors, on-prem AD vs Azure AD) and their failure modes

Describe how identity, SSO, and user provisioning interact across Control Hub and on-premises AD

Review deployment model trade-offs for a multi-site organization with on-prem Exchange and cloud calling

Draft a design decision record for calendar and directory integration in that scenario

Explain hybrid call routing failover behavior and how to design for PSTN and cloud service outages

Describe call-quality and analytics tooling available in Control Hub and how to interpret the key metrics

Walk through a cloud calling migration sequence for a site moving from on-premises Unified CM to Webex Calling

Identify the monitoring and alerting hooks an operations team should configure after cutover

Re-derive the full architecture diagram from week 1 without notes and correct any gaps

Complete timed practice across all five domains and categorize every miss by domain and root cause

Re-teach the two weakest topics in writing, as if explaining to a junior engineer

Review every deliverable from weeks 1-7 and consolidate them into a single exam-day reference sheet