Module 8.2 25 minIntermediate
Subnetting drills with worked answers
Ten timed problems matching the format and difficulty of the Final Weighted Exam, with the answer and the minimum reasoning to reach it.
Course plan — preview
Ten timed problems matching the format and difficulty of the Final Weighted Exam, with the answer and the minimum reasoning to reach it.
Q: What is the network address of 172.16.42.99 / 22? A: 172.16.40.0.
Why: /22 → mask 255.255.252.0 → magic 4 in octet 3. Largest multiple of 4 ≤ 42 is 40.
Q: How many usable hosts in 10.0.0.0 / 26? A: 62.
Why: 32 − 26 = 6 host bits → 64 addresses → 62 usable.
8 more sections in this chapter, plus a 2-question quiz.
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