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NCTI 2023 with verified questions and answers

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Question Answer What was the primary driver for development of IPv6? To address the issue of IPv4 address exhaustion. When comparing IPv4 to IPv6, which of the following statements is true IPv4 uses a 32-bit address scheme, while IPv6 uses a 128-bit address scheme. In IPv6-e...

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  • March 2, 2023
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  • 2022/2023
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NCTI
What was the primary driver for development of IPv6? - correct answerTo address the
issue of IPv4 address exhaustion.

When comparing IPv4 to IPv6, which of the following statements is true - correct
answerIPv4 uses a 32-bit address scheme, while IPv6 uses a 128-bit address scheme.

In IPv6-enabled networks, static addressing is no longer allowed. - correct
answerFALSE

Without IPv4's network address translation (NAT), IPv6 offers simpler packet
construction and better support for peer-to-peer and mobile-to-mobile types of
communications. - correct answerTRUE

In IPv6, Quality of Service (QoS) is radically changed, utilizing only the flow label for all
QoS provisioning. - correct answerFALSE

Unfortunately, only RIP (Routing Information Protocol) and OSPF (Open Shortest Path
First) are capable of routing IPv6. - correct answerFALSE

What size are IPv4 and IPv6 addresses, respectively? - correct answer32-bits, 128-bits.

IPv4 addresses are written in dotted-decimal. Which of these best describes how IPv6
addresses are written? - correct answerHexadecimal notation, dropping leading zeros in
each hextet, using the "::" notation to represent missing all-zero hextets.

IPv6 addresses are written in Binary Coded Decimal (BCD). - correct answerFALSE

An example of a single 16-bit "hextet" in an IPv6 address could be shown like this: -
correct answer:54a2:.

What is an "IID"? - correct answerInterface Identifier.

How large is a typical user-centric IPv6 subnet size, for a single subnet, using CIDR
notation? - correct answer/64

What does the notation "2000::/3" mean, in terms of the initial IETF allocation for IPv6
global unicast space? - correct answerThat global unicast addresses always start with
the first three bits "001" (first 3 bits of the address per the "/3" notation).

, Which of these prefix lengths would be a reasonable assignment for a service provider?
- correct answer/32

Which of these prefix lengths would be a reasonable assignment for a small single-
homed commercial enterprise with no more than 15 or 20 networks? - correct
answer/48.

What is a unique aspect of an "anycast" address? - correct answerIt is an address
typically assigned to more than one interface, typically on different nodes.

The leftmost 64-bits of an IPv6 unicast address typically describe: - correct answerThe
location in the IPv6 routing hierarchy of a particular subnet.

The rightmost 64-bits of an IPv6 unicast address typically describe: - correct answerThe
specific interface on the subnet.

The main types of IPv6 addresses are: - correct answerUnicast, anycast, and multicast.

What does the term "ULA" mean? - correct answerUnique Local Addresses.

The function of Unique Local Addresses are: - correct answerFor use within a network
enclave, and not routed or announced to the public Internet.

Link-local addresses come from which part of the IPv6 address space? - correct
answerFE8::/10.

IPv6 Multicast addresses always fall within what prefix? - correct answerFF00::/8.

What kind of unicast address does every IPv6 interface have to have? - correct
answerLink-local.

EUI-64 construction includes a unique marker for what purpose? - correct answerA bit
within the IID (rightmost 64-bits) set to indicate the IID was built from a globally-unique
token.

The scope over which link-local IPv6 addresses must be unique is: - correct answerOn
the link where the interface is configured.

In the multicast address FF02::1, the "0" describes: - correct answerThe "flags" for the
address.

Which is an example of an IPv6 multicast address that a router would normally listen
for? - correct answerFF02::1 (all nodes multicast, interface scope).

Which IPv6 multicast address does a DHCPv6 server listen on? - correct
answerFF05::1:3.

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