Practice Test Geeks(ICND1) Interconnecting Cisco Networking Devices Part 1 Practice Test
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Subnetting Flashcards

7 cards from real ICND1 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Subnetting flashcards as text

  1. What is the valid host range for the subnet 172.30.4.0/22?

    Answer: 172.30.4.1 – 172.30.7.254

    A /22 block spans 1024 addresses; 172.30.4.0 to 172.30.7.255, so valid hosts are .4.1 through .7.254.

  2. Which CIDR prefix provides exactly 510 usable host addresses?

    Answer: /23

    A /23 has 512 total addresses (2^9), minus 2 equals 510 usable hosts.

  3. A host has the IP address 10.10.16.55 with a mask of 255.255.252.0. What is its subnet's broadcast address?

    Answer: 10.10.19.255

    255.255.252.0 is /22; the block of 4 in the third octet containing 16 is 16–19, so broadcast is 10.10.19.255.

  4. In VLSM design, which benefit does it provide over classful subnetting?

    Answer: Allows different subnet sizes within the same network

    VLSM lets you apply different prefix lengths to different subnets, reducing address waste.

  5. What is the subnet mask in dotted-decimal notation for /19?

    Answer: 255.255.224.0

    /19 sets 19 bits; the third octet has top 3 bits set: 11100000 = 224, giving 255.255.224.0.

  6. How many total IP addresses (including network and broadcast) does a /29 subnet contain?

    Answer: 8

    A /29 has 32 - 29 = 3 host bits, so 2^3 = 8 total addresses.

  7. An engineer needs to connect two routers with a point-to-point link using the fewest IP addresses. Which subnet should be used?

    Answer: /30

    A /30 provides 4 addresses (2 usable), which is the traditional minimum for a point-to-point link per ICND1 objectives.