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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. What is the broadcast address for the subnet 10.10.20.0/28?

    Answer: 10.10.20.15

    A /28 has a block size of 16; starting at .0, the broadcast address is .0 + 16 – 1 = 10.10.20.15.

  2. Which type of IPv6 address is automatically configured on an interface and used for neighbor discovery and routing protocol traffic on the local link?

    Answer: Link-local

    Link-local addresses (FE80::/10) are auto-configured on every IPv6 interface and are used for local-link communication including NDP and routing protocol hellos.

  3. A company needs 10 subnets from 192.168.1.0/24 with at least 10 hosts each. Which prefix length meets both requirements?

    Answer: /27

    A /27 provides 32 subnets (2^5) from a /24 and 30 usable hosts each (2^3 – 2), satisfying both requirements.

  4. Which IPv6 address represents the loopback address?

    Answer: ::1

    ::1 (expanded: 0000:0000:0000:0000:0000:0000:0000:0001) is the IPv6 loopback address, equivalent to 127.0.0.1 in IPv4.

  5. What is the maximum number of subnets created when borrowing 4 bits from the host portion of a classful Class C network?

    Answer: 16

    Borrowing 4 bits provides 2^4 = 16 subnets (all 16 are usable with classless/CIDR addressing).

  6. Which feature allows a single public IPv4 address to be shared by many private hosts simultaneously?

    Answer: NAT/PAT

    NAT with Port Address Translation (PAT) maps many private IP addresses to a single public IP by tracking unique source port numbers.

  7. Which of the following correctly identifies the IPv6 address type FF05::2?

    Answer: Site-local multicast — all routers within the site

    FF05::2 is a site-scoped multicast address targeting all routers within the site (scope value 5 = site-local).