Redundancy and fault tolerance in HLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the primary goal of redundancy in system design.

HLD

The main purpose of redundancy is to [1] system availability during failures.

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Alimit

Bdecrease

Cignore

Dincrease

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'decrease' because of misunderstanding redundancy.

Redundancy is used to increase system availability by having backup components.

2fill in blank

medium

Complete the code to identify a common fault tolerance technique.

HLD

A common fault tolerance method is [1], which involves duplicating critical components.

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Areplication

Bcaching

Ccompression

Dencryption

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing replication with caching or compression.

Replication duplicates components to tolerate faults.

3fill in blank

hard

Fix the error in the statement about fault tolerance.

HLD

Fault tolerance means the system [1] when components fail without stopping.

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Acontinues

Bhalts

Ccrashes

Dignores

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'crashes' or 'halts' which are opposite of fault tolerance.

Fault tolerance means the system continues working despite failures.

4fill in blank

hard

Fill both blanks to complete the description of active-active redundancy.

HLD

In active-active redundancy, [1] components run [2] to handle requests simultaneously.

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Amultiple

Bsingle

Cindependently

Dsequentially

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'single' or 'sequentially' which do not fit active-active.

Active-active means multiple components run independently at the same time.

5fill in blank

hard

Fill all three blanks to complete the fault tolerance strategy code snippet.

HLD

If [1] fails, the system switches to [2] to maintain [3].

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Aprimary

Bbackup

Cavailability

Dcache

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing cache with backup or availability with cache.

The primary component fails, the backup takes over to keep availability.