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Update README.md #25

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Expand Up @@ -49,7 +49,7 @@ But before you begin, here are some topics(in no particular order) which in my o
Should know the TCP/IP stack, basics of how Internet, HTTP, TCP/IP work at the minimum. cs75 on youtube (1st lecture) should give a broad overview. I personally love [networking-a top down approach](http://www.amazon.com/Computer-Networking-Top-Down-Approach-Edition/dp/0132856204).
3. Concurrency basics: threads, processes, threading in the language you know. Locks , mutex etc.
4. DB basics: types of DB's (SQL vs noSQL etc ), hashing and indexing, EAV based databases, Sharding, caching for databases, master-slave etc
5. A basic idea of how a basic web architecture is: say load balancers, proxy, servers, Database servers, caching servers, precompute, logging big data etc. Just know broadly what is each layer for.
5. A basic idea of how a basic web architecture is: say load balancers, proxy servers, Database servers, caching servers, precompute, logging big data etc. Just know broadly what is each layer for.
6. very basic summary of what the [CAP theorem](http://robertgreiner.com/2014/08/cap-theorem-revisited/) is (Have never been asked about the theorem itself, but knowing it will help you in designing large-scale systems.

## <a name='howtoans'> How to answer in interviews </a>
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