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## System Design
This section contains only questions on System Design subject. The exercises can be found in [system-design-exercises repository](https://github.com/bregman-arie/system-design-exercises).
#### Architecture
<details>
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<summary>How would you scale the architecture from the previous question to hundreds of users?</summary><br><b>
</b></details>
#### Cache
<details>
<summary>What is "cache"? In what cases would you use it?</summary><br><b>
<summary>What is "cache"? In which cases would you use it?</summary><br><b>
</b></details>
<details>
<summary>What is distributed cache?</summary><br><b>
<summary>What is "distributed cache"?</summary><br><b>
</b></details>
<details>
<summary>What is a "cache replacement policy"?</summary><br><b>
Take a look [here](https://en.wikipedia.org/wiki/Cache_replacement_policies)
</b></details>
<details>
<summary>Which cache replacement policies are you familiar with?</summary><br><b>
You can find a list [here](https://en.wikipedia.org/wiki/Cache_replacement_policies)
</b></details>
<details>
<summary>Explain the following cache policies:
* FIFO
* LIFO
* LRU</summary><br><b>
Read about it [here](https://en.wikipedia.org/wiki/Cache_replacement_policies)
</b></details>
<details>
<summary>Why not writing everything to cache instead of a database/datastore?</summary><br><b>
</b></details>
#### Migrations