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Common Architecture Queestion

 
Greenhorn
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HI Friends,  Please find question attached. I have answered as N Tier, Three Tier, Two tier and single tier.
But it is showing as wrong answer. can you please provide your comments on this?
answer.png
[Thumbnail for answer.png]
 
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The correct answer should be N-tier, single tier, 2-tier, 3-tier

N-tier = distributed "mutiple" tiers kinda obvious

Single tier = "all client" needs updating because of business logic or data model (DB) change

2-tier = presentation and business logic intertwine (together), assuming the DB separate server

3-tier = presentation and business logic in common (assuming separate) server; DB separate server

 
Srinath Vangari
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Thanks Tsang. Have referred my notes and agree with you.
 
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