IPv6 Addressing

Front

What is the primary reason for the transition from IPv4 to IPv6?

Back

IPv4 is running out of addresses, with only 4.3 billion available, while IPv6 has a 128-bit address space allowing for 340 undecillion addresses.

Front

How are IPv6 addresses represented?

Back

IPv6 addresses are represented in hexadecimal format, consisting of 32 hexadecimal values, with each group of four hexadecimal characters called a hextet.

Front

What are the two main types of IPv6 unicast addresses?

Back

Global Unicast Address (GUA) and Link-local Address (LLA).

Front

What is the recommended prefix length for IPv6 addresses?

Back

The recommended IPv6 prefix length is /64.

Front

What does the double colon (::) signify in an IPv6 address?

Back

The double colon can replace any contiguous string of one or more 16-bit hextets consisting of all zeros, but can only be used once in an address.

Front

What is Stateless Address Autoconfiguration (SLAAC)?

Back

SLAAC allows a device to configure a Global Unicast Address (GUA) without DHCPv6, using Router Advertisement messages to obtain necessary information.

Front

What is the structure of a Global Unicast Address (GUA)?

Back

A GUA begins with the first three bits of 001 or 2000::/3, and is assigned by the service provider to identify subnets within a site.

Front

What is the purpose of a Link-local Address (LLA)?

Back

An LLA enables a device to communicate with other IPv6-enabled devices on the same local link and is not routable.

Front

What is the command to configure a static GUA on a router?

Back

The command is 'ipv6 address ipv6-address/prefix-length'.

Front

How does a device create a dynamic Link-local Address (LLA)?

Back

An LLA is dynamically created using the fe80::/10 prefix and an interface ID generated by the EUI-64 process or a randomly generated 64-bit number.