Computer Networks - IP Addressing
You want to create subnets that support exactly 30 hosts each. Which subnet mask should you choose?
You want to create subnets that support exactly 30 hosts each. Which subnet mask should you choose?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Calculate hosts per subnet for each mask
/27 = 32 addresses, hosts = 32 - 2 = 30 hosts.Step 2: Verify other options
/26 = 64 addresses, 62 hosts; /28 = 16 addresses, 14 hosts; /25 = 128 addresses, 126 hosts.Final Answer:
Subnet mask 255.255.255.224 (/27) supports 30 hosts -> Option DQuick Check:
/27 = 30 hosts per subnet [OK]
Quick Trick: Hosts = 2^(32-mask) - 2 [OK]
Common Mistakes:
MISTAKES- Choosing mask with too few or too many hosts
- Forgetting to subtract network and broadcast
- Mixing up mask bits and host bits
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