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CL-303 Cloud & Platform

Global Traffic Management & Cross-Cloud DR

Keep services answering when a region — or a cloud — disappears: Route 53 routing policies, Azure Traffic Manager, health-probe design, DNS-based cross-cloud failover with measured recovery times, and the failback discipline most teams forget to rehearse.

B5Advanced
5modules
33skill atoms
4role journeys
Curriculum

What this course covers.

5 modules, 33 named skill atoms. Expand any module to see them.

1DNS as a Control Plane6 skill atoms
TTL strategypolicy types comparedweighted, latency, geolocation & failover recordsalias vs CNAME at zone apexresolver caching beyond TTLpre-lowering TTL before a cutover
2Health Probes that Tell Truth7 skill atoms
endpoint designfalse-positive tuningdeep vs shallow health endpointsdependency scope in a health checkinterval & failure threshold tuningprobe source IP allow-listingcalculated health checks
3Cross-Cloud Failover Build6 skill atoms
primary AWS ↔ DR Azuretimed drillRoute 53 failover to a Traffic Manager endpointdata replication prerequisiteswarm capacity in the DR cloudcutover time measurement
4Failback Discipline7 skill atoms
data reconciliationcontrolled returnsplit-brain write detectionreplication direction reversaldrain before cut-backTTL restorationgo/no-go criteria
5DR Evidence Pack7 skill atoms
RTO measurementrunbookstakeholder reportRPO evidence from replication lagdrill timeline reconstructionrunbook validated by a non-authorgap list with owners
Where it fits

CL-303 in the role journeys.

This course appears in 4 of our 45 role journeys. Here is what a learner takes immediately before and after it in each.

Cloud / Solutions Architect

Professional stage
CL-301CL-303CL-404

Site Reliability Engineer

Professional stage
CL-313CL-303CL-319

Cloud Network Engineer

Professional stage
CL-302CL-303CL-401

Data Platform Engineer

Capstone stage
CL-222CL-303CL-504

Roles this course serves

The capability ladder

This course is authored to band B5.

Every course we run is written to one rung of the CASI ladder, so a plan can be assembled to take a team from where they are to where they need to be.

What do B1–B6 mean?The CASI Capability Ladder — click to expand

Every course targets a band on the CASI Capability Ladder — our six-band proficiency scale, anchored to open standards (O*NET, ESCO, NICE, NIST AI RMF, Bloom's). A band tells you how deep a course goes, and what evidence proves it.

What the learner can doTypical evidence
B1
AwareUnderstands concepts and vocabulary; uses tools with guidance
Knowledge checks
B2
FoundationPerforms standard tasks correctly in familiar contexts
Guided labs, autograded exercises
B3
PractitionerDelivers complete pieces of work independently
Scenario labs, proctored hands-on exams
B4
ProfessionalHandles production-grade complexity, trade-offs and failure modes
Break-fix drills, design defenses
B5
AdvancedEngineers systems end-to-end under constraints; leads others
Rubric-scored capstones, vivas
B6
ExpertSets direction; recognised authority across teams
Portfolio + panel evaluation

A note on B6. Courses in this catalog target B1–B5. B6 is not taught — it is recognised, through a portfolio and a panel, once someone is setting direction for others. Every journey here is built to land a learner at B5.

Next step

Run CL-303 for your team.

This course runs at several lengths depending on how deep you need to go and how much of it your people already have. Tell us who is being trained and we will scope it.

Add it to a training plan Talk to our team Check your team’s level free