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IPv4 and IPv6 Addressing Flashcards

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

Read the first 7 IPv4 and IPv6 Addressing flashcards as text

  1. Which IPv4 address class supports the most hosts per network?

    Answer: Class A

    Class A networks use only 8 bits for the network portion, leaving 24 bits for hosts — supporting over 16 million hosts per network.

  2. What is the subnet mask for a /26 prefix length in dotted-decimal notation?

    Answer: 255.255.255.192

    A /26 mask has 26 consecutive 1-bits, giving 255.255.255.192 (11000000 in the last octet).

  3. An IPv6 address written as 2001:0DB8:0000:0000:0000:0000:0000:0001 can be abbreviated to which of the following?

    Answer: 2001:DB8::1

    Leading zeros in each group can be removed and consecutive all-zero groups replaced with :: once, yielding 2001:DB8::1.

  4. Which command verifies the IPv6 address configured on a Cisco router interface?

    Answer: show ipv6 interface brief

    The 'show ipv6 interface brief' command displays IPv6 addresses and status for all interfaces.

  5. What is the valid host range for the subnet 192.168.10.64/26?

    Answer: 192.168.10.65 – 192.168.10.126

    The network address is .64 and the broadcast is .127, so valid hosts are .65 through .126.

  6. Which IPv6 address type is equivalent to an IPv4 private address and is used only within a site?

    Answer: Unique local

    Unique local addresses (FC00::/7) are used for internal communication within a site, similar to RFC 1918 private IPv4 addresses.

  7. A network administrator needs to divide 172.16.0.0/16 into subnets each supporting at least 500 hosts. Which subnet mask should be used?

    Answer: /23

    A /23 mask leaves 9 host bits (2^9 – 2 = 510 usable hosts), which satisfies the requirement of at least 500 hosts.