Large scale design

Question 1

What are the scalability levels?

Answer 1

Global, Enterprise, System, Applications, Macro, Micro, Object

Question 2

What are the advantages of Model-View-Controller?

Answer 2

• Separate functionality by concern
• Can be written in multiple languages
• Easier to substitute and extend

Question 3

What are the 6 main idea of distributed systems?

Answer 3

Concurrency, Administration, Distance, Distribution, Point of failure, Bottlenecks

Question 4

What is location transparency?

Answer 4

Interacting with a service regardless of location

Question 5

What is failure transparency?

Answer 5

If a machine goes down, the service continues uninterrupted

Question 6

What is load transparency?

Answer 6

No matter how many people use the system, it stays responsive

Question 7

What is upgrade transparency?

Answer 7

A component can be changed, moved, maintained or added to without bringing the system down

Question 8

What are URIs used for?

Answer 8

Universal Resource Identifier - used to give the web its location transparency

Question 9

What are the 3 methods of replication?

Answer 9

Alternative source, load balancing and local copies