A network technician borrows 5 bits from the 10.0.0.0/16 network to create subnets. What is the subnet mask that should be associated with each of the newly created subnets?

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A network technician borrows 5 bits from the 10.0.0.0/16 network to create subnets. What is the subnet mask that should be associated with each of the newly created subnets?

255.248.0.0
255.255.0.0
255.255.248.0
255.255.255.0
255.255.255.248

Explanation: Currently 16 bits are assigned to the network. If the network administrator borrows an additional 5 bits from the host field, 21 bits are now assigned to the network field. For the subnet mask, the first 21 bits (network) would be turned on and the last 11 (host) bits would be turned off. This creates a mask of 11111111.11111111.11111000.00000000 (255.255.248.0).

Exam with this question: CCNA 1 ITNv6 Chapter 8: Check Your Understanding