NCTI QUESTIONS AND ANSWERS 2023
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...
NCTI QUESTIONS AND ANSWERS 2023
Question - answer Answer
What was the primary driver for development of IPv6? - answer To address the issue
of IPv4 address exhaustion.
When comparing IPv4 to IPv6, which of the following statements is true - answer
IPv4 uses a 32-bit address scheme, while IPv6 uses a 128-bit address scheme.
In IPv6-enabled networks, static addressing is no longer allowed. - answer FALSE
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. - answer TRUE
In IPv6, Quality of Service (QoS) is radically changed, utilizing only the flow label for all
QoS provisioning. - answer FALSE
Unfortunately, only RIP (Routing Information Protocol) and OSPF (Open Shortest Path
First) are capable of routing IPv6. - answer FALSE
What size are IPv4 and IPv6 addresses, respectively? - answer 32-bits, 128-bits.
IPv4 addresses are written in dotted-decimal. Which of these best describes how IPv6
addresses are written? - answer Hexadecimal 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). - answer FALSE
An example of a single 16-bit "hextet" in an IPv6 address could be shown like this: -
answer :54a2:.
What is an "IID"? - answer Interface Identifier.
How large is a typical user-centric IPv6 subnet size, for a single subnet, using CIDR
notation? - answer /64
What does the notation "2000::/3" mean, in terms of the initial IETF allocation for IPv6
global unicast space? - answer That 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?
- 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? - answer /48.
What is a unique aspect of an "anycast" address? - answer It 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: - answer The
location in the IPv6 routing hierarchy of a particular subnet.
The rightmost 64-bits of an IPv6 unicast address typically describe: - answer The
specific interface on the subnet.
The main types of IPv6 addresses are: - answer Unicast, anycast, and multicast.
What does the term "ULA" mean? - answer Unique Local Addresses.
The function of Unique Local Addresses are: - answer For 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? - answer
FE8::/10.
IPv6 Multicast addresses always fall within what prefix? - answer FF00::/8.
What kind of unicast address does every IPv6 interface have to have? - answer Link-
local.
EUI-64 construction includes a unique marker for what purpose? - answer A 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: - answer On the
link where the interface is configured.
In the multicast address FF02::1, the "0" describes: - answer The "flags" for the
address.
Which is an example of an IPv6 multicast address that a router would normally listen
for? - answer FF02::1 (all nodes multicast, interface scope).
Which IPv6 multicast address does a DHCPv6 server listen on? - answer FF05::1:3.
Which of these is a key difference between the IPv4 packet structure and the IPv6
packet structure? - answer The IPv6 base header is fixed length, whereas the IPv4
header is variable length.
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