Subdomain
A subdomain is a bounded subdivision or subordinate namespace within a broader domain, such as a business area or a domain-name hierarchy.
Architecture Modernization: Socio-technical alignment of software, strategy, and structure
A business subdomain is a distinct subdivision of a broader business domain with its own related knowledge, activities, and bounded scope.
- How it is used
- Structures business areas into candidate value streams, team responsibilities, software boundaries, and modernization investments.
- How deep it goes
- Works through boundary heuristics, EventStorming, cohesion checks, and trade-offs; avoids prescribing one universally correct decomposition.
- Examples
- Uses loyalty levels, fulfillment capabilities, and alternative onboarding arrangements to test where related concepts belong.
- What you can do after
- Practice/perform collaborative subdomain mapping, assess candidate boundaries, and revisit them as business needs change.
Acing the CCNA Exam: Volume 2 Advanced Networking and Security
A subdomain is a domain located beneath another domain in the DNS hierarchy.
- How it is used
- Organizes DNS names into nested administrative and navigational levels.
- How deep it goes
- Explains hierarchy, naming terminology, and FQDN notation, but does not cover subdomain configuration.
- Examples
- Uses com, google.com, www.google.com, and the trailing root-domain dot to illustrate nesting and notation.
- What you can do after
- Evaluate DNS names by identifying their hierarchy level, parent domain, subdomain relationships, and FQDN notation.
Read how Acing the CCNA Exam: Volume 2 Advanced Networking and Security explains subdomain →
Building Web APIs with ASP.NET Core
A subdomain is a subordinate domain name created within a parent domain's namespace.
- How it is used
- Deploys a public endpoint for a web API through a parent domain and DNS provider.
- How deep it goes
- Explains naming and A-record configuration, but stops short of broader DNS and TCP/IP fundamentals.
- Examples
- Uses win-01.mybglist.com and mybglist-win-01.westeurope.cloudapp.azure.com as deployment addresses.
- What you can do after
- Operate/configure a custom Cloudflare subdomain that points to an Azure VM’s public IP address.
Read how Building Web APIs with ASP.NET Core explains subdomain →
Related concepts
- supporting subdomainincludes · A supporting subdomain is a business domain that enables core capabilities, typically requires organization-specific customization, and provides limited competitive differentiation.
- core subdomainincludes · A core subdomain is a strategically important business area whose distinctive, complex logic provides organizational differentiation or competitive advantage.
- generic subdomainincludes · A generic subdomain is a standardized business capability containing logic common across organizations and offering little opportunity for organization-specific differentiation.
- core domain chartused by · A core domain chart is a domain-driven design technique for classifying domains by their strategic importance and distinguishing core domains from supporting and generic domains.
- componentpart of · A software component is a modular part of a larger system that provides related functionality and interacts with other parts through defined boundaries or interfaces.
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