Practice Test Geeks(ICND1) Interconnecting Cisco Networking Devices Part 1 Practice Test
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IPv4 and IPv6 Flashcards

7 cards from real ICND1 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 flashcards as text

  1. Which IPv6 transition mechanism encapsulates IPv6 packets inside IPv4 packets to traverse IPv4 networks?

    Answer: 6to4 tunneling

    6to4 tunneling automatically encapsulates IPv6 traffic in IPv4 packets (protocol 41) to cross IPv4-only infrastructure.

  2. What is the subnet mask in dotted-decimal notation for a /20 prefix?

    Answer: 255.255.240.0

    A /20 means 20 bits are set to 1: the first two octets are 255.255, and the third octet has 4 bits set (11110000) = 240.

  3. Which type of IPv6 address is used to identify a set of interfaces, delivering the packet to the nearest one?

    Answer: Anycast

    Anycast addresses are assigned to multiple interfaces; routing delivers packets to the topologically nearest interface in that set.

  4. A router interface is configured with IP address 10.1.1.1/30. How many other hosts can be on this subnet?

    Answer: 1

    A /30 subnet has 4 addresses total; network=.0, broadcast=.3, so only .1 and .2 are usable — meaning one other host can share this subnet.

  5. What is the purpose of the IPv6 Neighbor Discovery Protocol (NDP)?

    Answer: Replace ARP and provide router/prefix discovery

    NDP uses ICMPv6 messages to perform address resolution (replacing ARP), router discovery, and prefix advertisement in IPv6 networks.

  6. Which private IPv4 address range is defined by RFC 1918 for Class B networks?

    Answer: 172.16.0.0 – 172.31.255.255

    RFC 1918 defines 172.16.0.0/12 (172.16.0.0 through 172.31.255.255) as the private Class B range.

  7. An IPv6 address is written as 2001:0DB8:0000:0000:0000:0000:0000:0001. What is its compressed form?

    Answer: 2001:DB8::1

    Leading zeros in each group are removed and the longest consecutive run of all-zero groups is replaced with :: giving 2001:DB8::1.