SLDC

🚀 Lifecycle Mastery: SDLC for the Modern Network Developer

🔧 Why SDLC Matters

• Brings structure to software development.
• Avoids “cowboy coding” (unstructured, error-prone development).
• Critical for infrastructure automation and DevNet certifications (e.g., DEVASC 200-901).

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📌 The Six Foundational Stages of SDLC

1. Planning (Requirements Analysis)
   • Define the problem the software will solve.
   • Gather input from stakeholders, users, and domain experts.
   • Define “what success looks like”.
2. Defining
   • Capture functional specifications in detail.
   • Define what the software should do — clearly and unambiguously.
3. Designing
   • Create architectural blueprint of the solution.
   • Get all stakeholders to agree before coding starts.
4. Building (Coding)
   • Convert design into actual code.
   • Usually smooth if planning/design were properly done.
5. Testing
   • Validate code correctness.
   • Catch bugs, defects, and check alignment with original requirements.
6. Deployment
   • Roll out software into production.
   • May start with limited users (pilot), then full release.
   • Evolves into continuous maintenance (updates, fixes).

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📚 Core SDLC Models You Must Know (as per DEVASC 200-901 Blueprint)

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1. 📐 Waterfall Model (Linear / Sequential)

Characteristics:

• Fixed scope decided early.
• Each stage must complete before moving to the next.
• Value only realized at the end.

Risks:

• Difficult to adapt to change.
• Testing may be skipped if time runs out.
• No working product till final stage.

Phases: Requirements → Design → Coding → Testing → Maintenance

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1. 🏭 Lean Model (Efficiency-First)

Origin: Toyota Production System (TPS)

Core Principles:

• 🔄 Elimination of Waste: Remove what doesn’t add value.
• ⏱️ Just-in-Time: Build only when needed.
• 🔧 Continuous Improvement (Kaizen): Iterate based on feedback and learning.

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1. 🔄 Agile Model (Modern Adaptive Development)

Origin: Agile Manifesto (2001)

Agile = Lean + Software Focus

Key Principles:

• ✅ Early and continuous delivery of valuable software.
• 🔄 Embrace changing requirements — even late in the project.
• 🚀 Frequent releases (typically 2-week “sprints”).
• 🤝 Daily collaboration between developers and business teams.

Agile = Fully functional software in small chunks

• 40% complete Agile project = 40% usable software.
• Helps businesses react and adapt quickly.

Agile Cycle Includes: Analysis → Design → Code → Test (All within a sprint)

Note: Agile is a core driver behind DevOps and Infrastructure as Code.

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🎯 Summary Table: SDLC Models Comparison

Feature	Waterfall	Lean	Agile
Approach	Sequential	Efficiency Philosophy	Iterative + Adaptive
Flexibility	Low	Medium	High
Delivery	End of lifecycle	As needed	Continuous (Sprints)
Customer Involvement	Minimal	Varies	High (Daily Collaboration)
Ideal for	Fixed-scope projects	Efficiency-driven teams	Fast-changing environments

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📘 Recommended For:

• DevNet Associate (DEVASC 200-901) candidates
• Infrastructure Automation Engineers
• Programmers interfacing with network systems
• Anyone shifting from traditional to programmable networks

💡 Pro Tip: SDLC isn’t just for developers — it’s essential for modern network engineers working in DevOps and automation.

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