01.IPv6

Some additional benefits of IPv6 when compared to IPv4 are as follows: ( 1 ) Simplified header ( 2 ) Autoconfiguration ( 3 ) Enhanced multicast support ( 4 ) Extension headers ( 5 ) Flow labels ( 6 ) Security and mobility built in ( 7 ) Improved address allocation ( 8 ) Strict aggregation

Besides a larger address space, what are some additional benefits of IPv6 when compared to IPv4?

An IPv6 address is 128 bits long and is represented in eight 16-bit hexadecimal segments. An example of an IPv6 address is as follows: 2001:0D02:0000:0000:0000:C003:0001:F00D

How many bits are in an IPv6 address?

An IPv6 host can be assigned ( 1 ) an address statically, ( 2 ) with stateless autoconfiguration, ( 3 ) or by Dynamic Host Configuration Protocol version 6 (DHCPv6). Note Hosts use stateless autoconfiguration by waiting for a router to advertise the local prefix. If the end system has a 48-bit MAC address, the host inverts the global/local bit (bit 7) and inserts 0xFFFE in the middle of the MAC address. This is called the EUI-64 address, and it is joined to the prefix to form the IPv6 address.

What are the three ways that an IPv6 host can be assigned an address?

The two rules for reducing the size of written IPv6 addresses are as follows: Rule 1: The leading 0s in any fields do not have to be written. If a field has fewer than four hexadecimal digits, it is assumed that the missing digits are leading 0s. For example: 2001:0D02:0000:0000:0000:C003:0001:F00D can be written as follows: 2001:D02:0:0:0:C003:1:F00D Rule 2: Any single, consecutive fields of all 0s can be represented with a double colon. For example, 2001:D02:0:0:0:C003:1:F00D can be further reduced to the following: 2001:D02::C003:1:F00D Note The double colon can be used only once.

What are the two rules for reducing the size of written IPv6 addresses?

A global unicast address ( GUA ) is a unicast address that is globally unique and can be routed globally. RFC 4291 specifies 2000::/3 to be reserved as global unicast address space to be allocated by the IANA.

What is a global unicast address? ( GUA )

A link-local unicast address is an IPv6 address whose address is confined to a single physical link. Thus the address is not routable off the physical subnet. Link-local addresses typically begin with FE80. The next digits can be assigned manually. If the interface ID is not assigned manually, it can be based on the interface MAC address. Note: An interface can have multiple link-local and global addresses.

What is a link-local unicast address?

An IPv6 anycast address is an address that represents a group of devices that support a similar service. Each device will be assigned the same anycast address. Routers will deliver data to the nearest node that is used in the common anycast address. Anycast addresses have a one-to-nearest mapping. To assign an anycast address to a router interface: --> configure a global unicast address with the keyword anycast appended to the end of the command line.

What is an IPv6 anycast address?

An IPv6 multicast address identifies a set of devices called a multicast group. It has a one-to-many mapping and also replaces IPv4 broadcast addresses. IPv6 multicast addresses use the reserved address space FF00::0/8.

What is an IPv6 multicast address?

An IPv6 unicast address is an address that identifies a single device. It has a one-to-one mapping. Unicast addresses: ( 1 ) include global, ( 2 ) link local, ( 3 ) loopback (::11), ( 4 ) and unspecified (::).

What is an IPv6 unicast address?

The EUI-64 standard explains how to stretch 802.3 MAC addresses from 48 to 64 bits by inserting the 16-bit 0xFFFE at the 24th bit of the MAC address to create a 64-bit unique identifier. Secondly, the universal/local (U/L) flag (bit 7) in the OUI portion of the address is flipped from 0 to 1 so that 1 now means universal. The EUI-64 standard is used to allow a host to automatically assign itself a unique 64-bit IPv6 address without the need for manual configuration or DHCP. For example, MAC address 00-AA-11-17-FC-0F on the network 2001:0DB8:0:1::/64 becomes 02-AA-11-17-FC-0F. The resulting EUI-64 address on the network is 2001:0DB8:0:1:02AA:11FF:17FE:FC0F.

What is the EUI-64 standard?

The address used for the IPv6 loopback address is 0:0:0:0:0:0:0:1, which is normally expressed as ::1.

What is the address used for the IPv6 loopback address?