Networking
Guess first
Guess: the wildcard for /26?
Most students flip this mask the wrong way. Guess first.
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Lesson notes
Key points
- A wildcard mask is the inverse of the subnet mask, so subtract each octet from 255.
- For a slash twenty-six, the block size is sixty-four, so the wildcard ends in sixty-three, one less than the block.
Quick check: What is the wildcard mask for a /26 network?
- 0.0.0.64
- 0.0.0.63
- 255.255.255.192
Wildcard last octet = block size minus 1.
Wildcard maskBlock − 1
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