7 IPv6 Addressing Free Online FlashCards

What does an IPv6 address identify?

An IPv6 address is a 128-bit identifier assigned to an interface.

How can leading zeros be shortened in an IPv6 group?

Leading zeros may be omitted in any group; for example, 0042 can be written as 42.

What does an IPv6 unicast address identify?

Unicast identifies one interface, and a packet addressed to it is delivered to that interface.

What is the purpose and prefix of IPv6 link-local addresses?

Link-local addresses use fe80::/10 and are used on a local link.

What does an IPv6 prefix length specify?

A prefix length gives the number of leftmost bits identifying the network prefix. For example, /56 leaves 72 bits outside the prefix.

What happens when an IPv6 subnet prefix grows by one bit?

Extending a prefix by one bit doubles the number of possible subnets and halves the number of addresses in each subnet.

How is a full IPv6 address written?

It uses eight groups of up to four hexadecimal digits, separated by colons.

What does :: represent in an IPv6 address?

Use :: for one consecutive run of zero groups. It may appear only once because it represents however many groups are needed to make eight.

What are the key rules for canonical IPv6 notation?

Use lowercase letters, omit leading zeros, and compress the longest zero run; if runs tie, choose the first. Do not use :: for just one zero group.

How does IPv6 anycast deliver a packet?

Anycast identifies a set of interfaces; a packet is routed to one member, typically the nearest according to routing.

What does an IPv6 multicast address identify?

Multicast identifies a group of interfaces, and a packet is delivered to that group. IPv6 multicast addresses are in ff00::/8.

How does IPv6 provide group delivery without broadcast?

IPv6 has no broadcast addresses; multicast provides group-delivery functions instead.