The Most Specific Rule Wins

A medium Python interview practice problem on DataDriven. Write and execute real python code with instant grading.

Domain

Python

Difficulty

medium

Seniority

mid

Problem

Your edge proxy screens inbound traffic against a firewall table, where each rule pairs a CIDR block with either `allow` or `block`. A source IP's verdict comes from the most specific rule whose range contains it: when two equally specific rules both match, the one later in the table wins, and an address no rule covers is allowed through. Walk the request log and return each source IP's verdict in arrival order.

Summary

Every packet asks the same question of the firewall. Answer it the way the table intends.

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