Choose Right Component

Question 1

Which cache eviction policy is to be used for caching recommended videos?

Answer 1

MRU

Question 2

Which cache eviction policy is to be used for caching products on e-Commerce website?

Answer 2

LFU

Question 3

Which cache eviction policy is to be used for the CPU buffer cache?

Answer 3

LRU

Question 4

When do you use cache-aside cache?

Answer 4

When you can’t afford to loose data

Question 5

When do you use a read-through cache?

Answer 5

Strong Consistency requirements

Question 6

When do you use a write-through cache?

Answer 6

Strong Consistency requirements

Question 7

When do you use a write-back or write-behind cache?

Question 8

When do you use a write-around cache?

Answer 8

When data is written once but rarely read.
E.G. real-time logs, chat room messages

Question 9

Which RAID configuration to use for increasing speed?

Answer 9

RAID 0

Question 10

Which RAID configuration to use for increasing reliability?

Answer 10

RAID 1

Question 11

Which RAID configuration to use for increasing speed as well as reliability?

Answer 11

RAID 5 (allows for single disk failure). Min: 3 disks required

Question 12

How RAID 5 is different from RAID 6?

Answer 12

RAID 6 allows for two disk failures.

Question 13

What is RAID 10?

Answer 13

Every two disks are first put in RAID 1 and resulting disks are put in RAID 0. 50% capacity is used for redundancy.