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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. A host has the IP address 10.4.8.77/21. What is the network address of this subnet?

    Answer: 10.4.0.0

    A /21 mask covers the first 21 bits; the third octet's top 5 bits identify the subnet — 8 (00001000) ANDed with the mask gives 10.4.0.0.

  2. What is the purpose of the IPv6 EUI-64 process?

    Answer: To generate a 64-bit interface ID from a 48-bit MAC address

    EUI-64 inserts FFFE in the middle of a 48-bit MAC address and flips the 7th bit to create a unique 64-bit interface ID.

  3. Which statement correctly describes VLSM (Variable Length Subnet Masking)?

    Answer: Subnets can use different prefix lengths to optimize address space

    VLSM allows different subnets within the same address space to use different prefix lengths, enabling efficient IP address utilization.

  4. Which IPv4 address block is used for APIPA (Automatic Private IP Addressing) when DHCP is unavailable?

    Answer: 169.254.0.0/16

    Windows assigns APIPA addresses from 169.254.0.0/16 when a DHCP server cannot be reached.

  5. How many bits make up an IPv6 address?

    Answer: 128

    IPv6 addresses are 128 bits long, expressed as eight groups of four hexadecimal digits.

  6. A router interface is configured with 'ipv6 address 2001:DB8:A:1::/64 eui-64'. What does the eui-64 keyword cause the router to do?

    Answer: Derive the interface ID from the interface's MAC address using EUI-64

    The eui-64 keyword instructs the router to generate the 64-bit interface ID automatically from the interface's MAC address using the EUI-64 method.

  7. Which subnet contains the host address 192.168.5.200/27?

    Answer: 192.168.5.192/27

    With /27 (block size 32), subnet boundaries are .0, .32, .64, .96, .128, .160, .192, .224 — the address .200 falls in the 192.168.5.192/27 subnet.