Networking · Beginner → Expert
🌍 DNS, Domains and Internet Infrastructure
Understand and operate DNS from registrar delegation through recursive resolution, authoritative zones, DNSSEC, email records, troubleshooting, resilience, and change management.
Course roadmap
Pass each module exam to unlock the next module.
Module 1 · Beginner
Domain Names, Registries, Registrars and Delegation
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Module 2 · Beginner
DNS Hierarchy, Root, TLD and Authoritative Servers
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Module 3 · Beginner
Recursive Resolution, Caching and TTL Behavior
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Module 4 · Beginner
Zones, SOA, NS and Authoritative Data
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Module 5 · Intermediate
A, AAAA, CNAME and Addressing Records
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Module 6 · Intermediate
MX, SPF, DKIM and DMARC Record Concepts
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Module 7 · Intermediate
TXT, SRV, CAA, PTR and Service Discovery Records
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Module 8 · Intermediate
Subdomains, Wildcards, Delegation and Glue Records
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Module 9 · Advanced
DNSSEC, Signing, Validation and Trust Chains
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Module 10 · Advanced
Dynamic DNS, APIs and Automation
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Module 11 · Advanced
Split-Horizon DNS and Internal Name Resolution
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Module 12 · Advanced
Anycast, Secondary DNS and Resilient Architecture
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Module 13 · Advanced
Propagation, Negative Caching and Change Planning
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Module 14 · Expert
dig, nslookup and Evidence-Based Troubleshooting
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Module 15 · Expert
DNS Security, Poisoning Risks and Operational Hardening
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Module 16 · Expert
CDN, Reverse Proxy and DNS Traffic Steering Concepts
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Module 17 · Expert
Expert Capstone: Production DNS Architecture
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Certification gate
Final course exam
Pass mark: 80%. Time limit: 360 minutes. All module exams must be passed first.
Locked until modules are passed