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NCTI Question and answers 100% correct 2023
NCTI Question and answers 100% correct 2023
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NCTIQuestion - correct answer Answer
What was the primary driver for development of IPv6? - correct answer To address
the issue of IPv4 address exhaustion.
When comparing IPv4 to IPv6, which of the following statements is true - correct
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. - correct 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. - correct answer TRUE
In IPv6, Quality of Service (QoS) is radically changed, utilizing only the flow label for all
QoS provisioning. - correct answer FALSE
Unfortunately, only RIP (Routing Information Protocol) and OSPF (Open Shortest Path
First) are capable of routing IPv6. - correct answer FALSE
What size are IPv4 and IPv6 addresses, respectively? - correct answer 32-bits, 128-
bits.
IPv4 addresses are written in dotted-decimal. Which of these best describes how IPv6
addresses are written? - correct 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). - correct answer FALSE
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 answer Interface 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 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?
- 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 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: - correct answer
The location in the IPv6 routing hierarchy of a particular subnet.
The rightmost 64-bits of an IPv6 unicast address typically describe: - correct answer
The specific interface on the subnet.
The main types of IPv6 addresses are: - correct answer Unicast, anycast, and
multicast.
What does the term "ULA" mean? - correct answer Unique Local Addresses.
The function of Unique Local Addresses are: - correct 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? - correct
answer FE8::/10.
IPv6 Multicast addresses always fall within what prefix? - correct answer FF00::/8.
What kind of unicast address does every IPv6 interface have to have? - correct answer
Link-local.
EUI-64 construction includes a unique marker for what purpose? - correct 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: - correct answer
On the link where the interface is configured.
In the multicast address FF02::1, the "0" describes: - correct answer The "flags" for
the address.
Which is an example of an IPv6 multicast address that a router would normally listen
for? - correct answer FF02::1 (all nodes multicast, interface scope).
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