Computer Networks - IP Addressing
You have a network 172.16.0.0/16 and need at least 500 subnets. Which subnet mask should you use?
You have a network 172.16.0.0/16 and need at least 500 subnets. Which subnet mask should you use?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Calculate bits needed for 500 subnets
500 subnets require at least 9 bits (2^9=512) for subnetting.Step 2: Determine new subnet mask
Original mask /16 + 9 bits = /25 (255.255.255.128). /25 gives 512 subnets, enough for 500.Step 3: Check other masks
/24 adds 8 bits, total 24 bits, which gives 2^(24-16)=256 subnets, less than 500.Step 4: Check /23 mask
/23 adds 7 bits, 2^(23-16)=128 subnets, less than 500.Step 5: Check /20 mask
/20 adds 4 bits, 2^(20-16)=16 subnets, less than 500.Final Answer:
Use subnet mask 255.255.255.128 (/25) to get at least 500 subnets -> Option CQuick Check:
500 subnets need /25 or smaller mask [OK]
Quick Trick: More subnets need more bits in subnet mask [OK]
Common Mistakes:
MISTAKES- Confusing subnet bits with host bits
- Choosing mask with fewer subnet bits
- Miscounting bits needed for subnets
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