About This Flashcard Deck
This flashcard deck contains 10 cards covering key Subnetting concepts for the CCNA exam. Test your IPv4 subnetting skills for the CCNA exam. Use active recall by attempting to answer each question before revealing the answer.
Question
How many usable hosts are in a /26 subnet?
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Answer
62 usable hosts. 2^6 − 2 = 62 (6 host bits).
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All Subnetting Flashcards
Q: How many usable hosts are in a /26 subnet?
A: 62 usable hosts. 2^6 − 2 = 62 (6 host bits).
Q: What is the subnet mask for /27?
A: 255.255.255.224
Q: What is the wildcard mask for 255.255.255.240?
A: 0.0.0.15 (255.255.255.255 − 255.255.255.240).
Q: How many subnets can you create by borrowing 3 bits?
A: 8 subnets (2^3 = 8).
Q: What is the broadcast address of 192.168.1.64/26?
A: 192.168.1.127 (block size 64: 64 + 64 − 1 = 127).
Q: What subnet does host 10.1.1.200/25 belong to?
A: 10.1.1.128/25 (block size 128: 128 < 200 < 256, so network = .128).
Q: What is the purpose of VLSM?
A: Variable Length Subnet Masking allows subnets of different sizes within the same network, reducing IP address waste.
Q: What is a /30 subnet typically used for?
A: Point-to-point links between routers (2 usable host addresses).
Q: What are the APIPA addresses?
A: 169.254.0.0/16 — auto-assigned when a device cannot reach a DHCP server.
Q: How many /28 subnets fit in a /24 network?
A: 16 subnets (2^4 = 16, borrowing 4 bits from the host portion).
Cisco Flashcard Study Strategy
Cisco exams heavily test protocol operations and configuration details. Use these flashcards to drill port numbers, protocol behaviours, and administrative distances. Pair flashcard sessions with Packet Tracer labs — when you encounter a card about OSPF neighbour states, open a lab and verify each state transition on a live topology. This combination of memorisation and practice builds the deep understanding Cisco exams demand.