Practice Test Geeks(CCST) Cisco Certified Support Technician Practice Test
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IPv4 vs. IPv6 Addressing Flashcards

6 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 purpose of the IPv6 loopback address ::1?

    Answer: To test the local TCP/IP stack without sending traffic on the network

    ::1 (equivalent to 127.0.0.1) tests the local device's TCP/IP stack without generating network traffic.

  2. Which notation rule replaces consecutive groups of zeros in an IPv6 address with ::?

    Answer: Zero compression

    Zero compression replaces one contiguous sequence of all-zero groups with :: (can only appear once per address).

  3. What is NAT64 and when is it used?

    Answer: A translation mechanism allowing IPv6-only devices to communicate with IPv4-only servers

    NAT64 translates between IPv6 and IPv4 protocols, used with DNS64 for address mapping.

  4. How does the IPv6 header differ from IPv4 in complexity?

    Answer: IPv6 has a simplified fixed-size header with fewer fields, using extension headers for optional features

    IPv6 has a fixed 40-byte header with 8 fields vs IPv4's variable 20-60 byte header with 12+ fields.

  5. What is the difference between IPv6 global unicast and unique local addresses?

    Answer: Global unicast (2000::/3) is internet-routable; unique local (fc00::/7) is for private organizational use

    Global unicast addresses are publicly routable; unique local addresses (like IPv4 RFC 1918) are for internal use.

  6. Why was IPv6 designed to eliminate NAT?

    Answer: IPv6's vast address space provides enough public addresses for every device, restoring end-to-end connectivity

    128-bit addresses provide enough unique global addresses for every device, eliminating the scarcity that necessitated NAT.