added more questions

exams/extras.md

@@ -51,6 +51,12 @@ What is BDD?
 
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+What is the "Iron Triangle of Planning" and what are the three limitations, explain each?
+
+Describe both waterfall and agile approaches with respect to these limitations.
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+
 List and explain four problems with detailed specifications.
 
 How does an agile methodology reduce risk?
@@ -85,6 +91,14 @@ Explain the following terms used in agile development:
 
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+What is "Docker"?
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+Explain the purpose of the relationship between **Docker Engine**, **Docker Compose** and **Docker Machine**.
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+WHat is the purpose and what are the benefits of **Docker Swarm**.
+
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+
 MoSCoW is an acronym often used in agile planning:
 
 1. Expand the acronym and explain it
@@ -200,4 +214,4 @@ Continuous Integration and Continuous Deployment are often used by software deve
 2. What are the benefits
 3. What are the challenges to adoption
 
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