Module 2 / Unit 3 / IPv6 Addressing

Question 1

Convert the binary value “1010 0001 1000 1100” to hex.

Answer 1

A18C

Question 2

Which of the following IPv6 addresses is a valid unicast host address?
○
fe80::218:8bff:fea7:bd37
○
fe80::219:d2ff::7850
○
ff02::219:d2ff:fea7:7850
○
\::/128

Answer 2

fe80::218:8bff:fea7:bd37 - TRUE
fe80::219:d2ff::7850 - FALSE
ff02::219:d2ff:fea7:7850 - FALSE
::/128 - FALSE

Question 3

What is an EUI-64 and how might it be used by IPv6?

Answer 3

Extended Unique Identifier (EUI) is IEEE’s preferred term for a MAC address. EUI-64 is a 64-bit hardware interface ID. A 48-bit MAC address can be converted to an EUI-64 using a simple mechanism. The EUI-64 can be used as the IPv6 interface ID, though a randomly generated token is often preferred.

Question 4

In IPv6, how is the loopback address best expressed

Answer 4

::1.

Question 5

In IPv6, how could you distinguish a unicast address with global scope from other addresses?

Answer 5

Starts with binary “001” or hex “2” or “3”.

Question 6

If assigned a single global IPv6 address prefix, how many bits are available for subnetting?

Answer 6

16 bits.

Question 7

What type of IPv6 unicast address is not routable?

Answer 7

Link-local address (and Unique Local Addresses (ULA).

Question 8

What is anycast?

Answer 8

A special type of multicast where a message can be sent to any member of a group (the closest available one) but not all of them.

Question 9

In IPv6, how can a client obtain a routable IPv6 address without requiring manual configuration?

Answer 9

Stateless Address Autoconfiguration (SLAAC) allows a host to autoconfigure an interface by listening for Router Advertisements to obtain a network prefix.

Question 10

What is 6to4?

Answer 10

A method of tunneling IPv6 packets over a IPv4 network.