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IP Addressing & Subnetting Flashcards

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

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  1. What is the subnet mask in CIDR notation for the address 192.168.10.0/26?

    Answer: 255.255.255.192

    /26 means 26 bits are set to 1, producing a subnet mask of 255.255.255.192.

  2. How many usable host addresses are available in a /29 subnet?

    Answer: 6

    A /29 subnet has 2^3 = 8 addresses total, minus 2 (network and broadcast) = 6 usable hosts.

  3. Which IP address class uses the default subnet mask 255.255.0.0?

    Answer: Class B

    Class B addresses (128.0.0.0–191.255.255.255) use the default subnet mask 255.255.0.0.

  4. What is the broadcast address for the subnet 10.0.0.64/26?

    Answer: 10.0.0.127

    The /26 block starting at .64 spans .64–.127, so .127 is the broadcast address.

  5. A host has the IP address 172.16.50.100 with a /20 mask. What is the network address?

    Answer: 172.16.48.0

    /20 increments in blocks of 16 in the third octet; 48 is the nearest multiple of 16 below 50.

  6. Which of the following is a valid private IP address range as defined by RFC 1918?

    Answer: 172.16.0.0–172.31.255.255

    RFC 1918 defines 172.16.0.0/12, which spans 172.16.0.0 through 172.31.255.255.

  7. What type of IPv4 address is 169.254.10.5?

    Answer: APIPA (link-local)

    Addresses in the 169.254.0.0/16 range are APIPA (Automatic Private IP Addressing) link-local addresses assigned when DHCP fails.