IPv6 Addressing Flashcards
Duplicate Address Detection (DAD)
A process during IPv6 address autoconfiguration in order to verify that an IPv6 address is unique on the LAN before that address is assigned to a physical interface.
Extended Unique Identifier (EUI-64)
Used to automatically configure an IPv6 address using the 48-bit MAC address of the interface. Since an interface ID is 64 bits, the MAC address value is split in the middle and the hexadecimal value FFEE is inserted between the two halves, and the 7th bit of this new combined value is inverted.
Internet Assigned Numbers Authority
An organization that oversees global IP address allocation and other Internet protocol-related information.
IPv6 Anycast
A one-to-nearest type of IPv6 communication where traffic from one source IP address can be routed to a variety of destinations. The routing decision is typically made based on the most optimal path to one of several identical servers.
IPv6 Global Unicast Address
An IPv6 address that is routable on the public Internet and unique to only one device, beginning with the prefix 2003::/3.
IPv6 Link Local Address
An IPv6 address that can only be sent to a destination on the same local network segment, beginning with the prefix FE80::/10.
IPv6 Loopback Address
Allows a router to communicate with itself for troubleshooting and testing purposes, similar to the IPv4 loopback address 127.0.0.1. In IPv6, the loopback address is designated as ::1, which is 127 binary 0s with the final bit set to binary 1.
IPv6 Multicast
A one-to-many type of IPv6 communication where one source IP addresses sends information to one or more destination IP addresses which are specifically listening for the messages. IPv6 multicast addresses always begin with the hexadecimal value FF as the first two digits.
IPv6 Solicited-Node Multicast
Addresses used in the Neighbor Discovery Protocol for obtaining the link-layer addresses of other nodes on the LAN. These addresses begin with the prefix FF02::1:FF in the first 104 bits, with the last 24 bits taken from the interface destination IPv6 address. These are used in place of a broadcast message in IPv6.
IPv6 Unicast
A one-to-one type of IPv6 communication where one source IP address sends information to one destination IP address.
IPv6 Unique Local Address
An IPv6 address that is routable within a local network, but not routable on the public Internet. These addresses begin with the prefix FC00::/7.
IPv6 Unspecified Address
An IPv6 source address consisting of 128 binary 0s, which can be represented simply as a double colon. This can be used as the initial address by a client during IPv6 address self-assignment, in order to make sure a unique address is obtained on the LAN through neighbor solicitation.
Neighbor Solicitation
Messages sent out by an IPv6 client that are used to gather information about other nodes on the LAN, such as their link-layer address and their reachability status.
Prefix
The portion of an IPv6 address that represents the network portion, similar to the subnet mask used in IPv4 addresses.
Prefix Length
A value used to indicate the number of leftmost contiguous bits of an IPv6 address used for the network address.
