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NCTI (Questions & Answers)
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NCTI (Questions & Answers)What was the primary driver for development of IPv6? Correct Ans -
To address the issue of IPv4 address exhaustion.
When comparing IPv4 to IPv6, which of the following statements is true
Correct Ans - 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
Ans - 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 Ans - TRUE
In IPv6, Quality of Service (QoS) is radically changed, utilizing only the flow
label for all QoS provisioning. Correct Ans - FALSE
Unfortunately, only RIP (Routing Information Protocol) and OSPF (Open
Shortest Path First) are capable of routing IPv6. Correct Ans - FALSE
What size are IPv4 and IPv6 addresses, respectively? Correct Ans - 32-
bits, 128-bits.
IPv4 addresses are written in dotted-decimal. Which of these best describes
how IPv6 addresses are written? Correct Ans - 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 Ans -
FALSE
An example of a single 16-bit "hextet" in an IPv6 address could be shown like
this: Correct Ans - :54a2:.
What is an "IID"? Correct Ans - Interface Identifier.
, How large is a typical user-centric IPv6 subnet size, for a single subnet, using
CIDR notation? Correct Ans - /64
What does the notation "2000::/3" mean, in terms of the initial IETF allocation
for IPv6 global unicast space? Correct Ans - 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 Ans - /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 Ans - /48.
What is a unique aspect of an "anycast" address? Correct Ans - 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
Ans - The location in the IPv6 routing hierarchy of a particular subnet.
The rightmost 64-bits of an IPv6 unicast address typically describe:
Correct Ans - The specific interface on the subnet.
The main types of IPv6 addresses are: Correct Ans - Unicast, anycast,
and multicast.
What does the term "ULA" mean? Correct Ans - Unique Local
Addresses.
The function of Unique Local Addresses are: Correct Ans - 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 Ans - FE8::/10.
IPv6 Multicast addresses always fall within what prefix? Correct Ans -
FF00::/8.
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