The CCNA 200-301 exam gives you 120 minutes for roughly 100–120 questions, which averages to about one minute per question. In practice, though, not all questions take the same amount of time. Multiple-choice theory questions can be answered in 20–40 seconds if you know the material cold, while labs and simulations may take several minutes. That means you need to “bank” time on quicker questions—including subnetting—so you’re not rushed later on. Think of subnetting speed as a form of time insurance: the faster you get at it, the more breathing room you’ll have for complex scenarios.
Beginner / early study: 2–3 minutes per subnetting problem while working step by step.
CCNA-ready student: ~45 seconds or less per problem (fast enough to keep exam pace comfortable).
Fluent subnetter (“pro level”): 15–25 seconds. These students quickly spot powers of two, mask/host relationships, and ranges without long math.
Memorize the powers of 2 (up to 4096). Practice by writing them down during study sessions, then make a quick table before the exam during the instructional slideshow. This way, you won’t waste time recalculating during subnetting questions.
Know your “magic numbers.” (Subnet increments like 128, 64, 32, 16, 8, 4, 2.)
Use mental shortcuts. (Instead of subtracting 2 for hosts every time, know /30 = 2 hosts, /29 = 6 hosts, etc.)
Drill daily. Focus on accuracy first, then reduce your solving time gradually.
If you can consistently solve subnetting questions in 30–45 seconds with 100% accuracy, you’re in the safe zone for the CCNA exam.
On the CCNA, subnetting isn’t just about getting the answer right—it’s about getting it right fast. PocketCLI helps you build that speed through unlimited, varied practice.
✅ Unlimited subnetting questions – each one randomly generated so you never see the same problem twice.
✅ Natural speed training – the more you practice, the faster you’ll recognize patterns and solve in exam-ready time.
✅ Instant feedback – not just the answer, but the reasoning behind it.
✅ Step-by-step calculation breakdowns – learn exactly how to find the network ID, broadcast address, valid hosts, and increments.
✅ Anytime, anywhere drills – perfect for short study bursts or deep practice sessions.
PocketCLI prepares you to tackle subnetting questions with accuracy, confidence, and exam-day speed—without the stress.
Example Q&A:
Question:
How many subnets can be created from the network 118.210.83.217 255.192.0.0?
Answer:
Other information:
CIDR Notation: 10
Wildcard Mask: 0.63.255.255
Network Address: 118.192.0.0
First Address: 118.192.0.1
Last Address: 118.255.255.254
Broadcast Address: 118.255.255.255
Number of subnets: 4
Number of hosts/subnet: 4194302
To determine how many subnets can be created from a given network, we start by identifying the class of the IP address.
The number of subnets is determined by comparing the default mask for the IP class with the given subnet mask.