How long will it take them to transfer the data over the internet if the transfer goes smoothly?

A startup client of yours does offline data processing for a few of its clients. They are mi-grating their applications and the associated data to Google Cloud. They have 100TB of data to move. They presently have a very small private data center setup connected to a local internet provider. The maximum bandwidth they are able to get is 100Mbps .

How long will it take them to transfer the data over the internet if the transfer goes smoothly?
A . About 12 days.
B . About 2 years.
C . About 100 days.
D . About 24 hours.

View Answer

Answer: C

Explanation:

The key reason I included this question is to clarify some terminologies that will be important for your estimates. The data size mentioned is a TB terabyte. Note the "byte". The speed is mentioned in Mbps, which is Megabits per second. Note the "bits". 8 bits make a byte. So, to get the actual number of bits transferred, you need to multiply the TB number by 8.

Total data transferred (in bits) = 100 * 1,000,000,000,000 * 8 bits

Speed = 100Mbps = 100 * 1,000,000. i.e. 100 million bits are transferred per second.

Hence time taken to transfer all the data = Total Data/Speed = 8,000,000 seconds.

Number of seconds in a day = 24*60*60 = 86,400

Total time taken in days = 8,000,000/86,400 = 92.59 days

Reference link- https://cloud.google.com/architecture/migration-to-google-cloud-transferring-your-large-datasets#online_versus_offline_transfer