CSE 316 · Session 10 · try it yourself

Where the ones stop — is where the network stops

A mask is not a magic number. It is a boundary, written as 32 bits so a router can apply it with one instruction. Drag the boundary and watch the network swallow the address.

Any address in the block

Prefix length — where the network part ends /27

Thirty-two bits — network part, host part, and the AND that separates them

The mask

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Block size 2^(32−n)

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Network address

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address AND mask

The range it covers

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first — last

bitsarebits.com · CSE 316 — Data Communication & Networking