How can I practice subnetting fast for the CCNA exam?

Drill with 20 to 30 random subnetting questions per day. Memorise the block-size table and aim for under 30 seconds per question. Use this quiz with the Easy difficulty first, then Mixed, then Hard.

Why are subnetting questions still on the CCNA in 2026?

Even with IPv6 widely deployed, the fundamentals — binary maths, block sizes, network and broadcast detection — remain the basis for understanding every routing protocol and ACL.

What is the shortcut for finding the broadcast address?

Find the network address, then add (block size − 1) to the relevant octet. Faster than mask-by-OR in your head.

How do I get under one minute per subnetting question?

Memorise the powers of 2 to 2^16, the block size table for the fourth octet, and the rule 'broadcast = next network − 1'. Practice daily.

Subnetting Practice Quiz

Difficulty Round size

1/10

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About this quiz

85 exam-grade questions modelled on CCNA 200-301 + CompTIA Network+ N10-008/N10-009 practice patterns. Each is hand-curated against real RFC / NIST / IEEE standards with carefully designed distractors that catch common student mistakes. Difficulty tiers: easy (single-step, /24-/30 or basic definitions), medium (one trick angle, comparisons), hard (multi-step, allocation + summarisation, attack analysis), expert (scenario-based, PKI / OSPF / forensic).

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