Back-of-the-envelope estimation in HLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to estimate the number of requests per second for a system.

HLD

requests_per_second = total_requests [1] total_seconds

Drag options to blanks, or click blank then click option'

A+

B*

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using multiplication instead of division.

Adding or subtracting instead of dividing.

To find requests per second, divide total requests by total seconds.

2fill in blank

medium

Complete the code to estimate the total storage needed for user data.

HLD

total_storage_gb = number_of_users [1] average_data_per_user_gb

Drag options to blanks, or click blank then click option'

A-

B+

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Dividing instead of multiplying.

Adding instead of multiplying.

Total storage is the number of users multiplied by average data per user.

3fill in blank

hard

Fix the error in the code estimating peak traffic per hour.

HLD

peak_traffic_per_hour = average_traffic_per_minute [1] 60

Drag options to blanks, or click blank then click option'

A*

B/

C+

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Dividing by 60 instead of multiplying.

Adding or subtracting 60.

To get hourly traffic from per minute, multiply by 60 minutes.

4fill in blank

hard

Fill both blanks to estimate total bandwidth needed for video streaming.

HLD

total_bandwidth_mbps = number_of_streams [1] average_bandwidth_per_stream_mbps [2] overhead_factor

Drag options to blanks, or click blank then click option'

A*

B+

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Adding instead of multiplying.

Subtracting overhead factor.

Total bandwidth is number of streams times average bandwidth per stream, multiplied by overhead factor.

5fill in blank

hard

Fill all three blanks to estimate the number of servers needed.

HLD

servers_needed = (total_requests_per_second [1] requests_per_server_capacity) [2] safety_margin [3] 1

Drag options to blanks, or click blank then click option'

A/

B*

C+

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Multiplying instead of dividing for base servers.

Adding safety margin instead of multiplying.

Not adding buffer server.

Divide total requests by server capacity, multiply by safety margin, then add 1 for buffer.