You have a network 10.0.0.0/24 and need at least 6 subnets. Which subnet mask should you use to create enough subnets?

hard📝 Application Q15 of 15

Computer Networks - IP Addressing

You have a network 10.0.0.0/24 and need at least 6 subnets. Which subnet mask should you use to create enough subnets?

A255.255.255.192

B255.255.255.224

C255.255.255.0

D255.255.255.128

Step-by-Step Solution

Solution:

Step 1: Calculate required subnet bits
To create at least 6 subnets, find minimum bits n where 2^n ≥ 6. Here, n=3 (2^3=8 subnets).
Step 2: Determine new subnet mask
Original mask /24 means 24 bits for network. Adding 3 bits for subnetting gives /27 mask.
Step 3: Convert /27 to subnet mask
/27 corresponds to 255.255.255.224.
Final Answer:
255.255.255.224 -> Option B
Quick Check:
3 subnet bits = /27 = 255.255.255.224 [OK]

Quick Trick: Use 2^n ≥ needed subnets to find mask [OK]

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