1.9 IPv6 Address Types Flashcards
Summarize IPv6 address types, including Unicast, Anycast, Multicast, and Modified EUI 64. (22 cards)
Define:
unicast IPv6 addressing
It refers to a unique address assigned to a single interface.
Unicast is used for communication between one sender and one receiver in IPv6.
Define:
global unicast address
A globally routable IPv6 address, similar to a public IPv4 address.
These addresses are assigned from the 2000::/3 range and are used for devices that need to be globally reachable.
What is the range of global unicast addresses in IPv6?
2000::/3
Global unicast addresses are publicly routable on the IPv6 internet and begin with 2000::/3.
Global unicast addresses are not routable on the public internet.
False
Global unicast addresses are routable on the public IPv6 internet, as they are unique and assigned to devices that require internet connectivity.
Why is a unique local address (ULA) used in IPv6?
They are used for local communication and are not internet-routable.
ULAs provide a private address space in IPv6, similar to IPv4 private addresses (e.g., 10.0.0.0/8).
Describe the characteristics of a link-local address in IPv6.
They are used for local communication and are not routed.
These addresses start with the prefix FE80::/10 and are automatically assigned to all IPv6-enabled interfaces for communication within the same network segment.
True or False:
A link-local address is required on every IPv6-enabled interface.
True
Every IPv6 interface must have a link-local address for communication on the local network.
Fill in the blank:
An ________ address in IPv6 routes packets to the nearest interface.
anycast
Anycast addresses are used to route packets to the closest available node in a group of potential receivers.
What is the role of anycast addressing in IPv6?
It enables communication from one sender to the nearest receiver.
This is commonly used in routing protocols and services such as DNS.
True or False:
Anycast addresses are used for one-to-many communication in IPv6.
False
Anycast is one-to-one communication to the nearest node, not one-to-many.
How does a router use an anycast address in IPv6?
They use anycast to send packets to the closest node.
Anycast improves routing efficiency by targeting the nearest node in a group of routers with the same anycast address, instead of broadcasting to all nodes.
True or False:
A single IPv6 address can be both a unicast and anycast address.
True
Anycast addresses can be configured on multiple devices, but the same address can also be used as a unicast address for specific communication between devices.
Define:
multicast addressing in IPv6
It refers to one-to-many communication from a single sender to multiple receivers.
Multicast addresses in IPv6 begin with FF00::/8 and can have different scopes (e.g., link-local, site-local).
What is the range of multicast addresses in IPv6?
FF00::/8
Multicast addresses start with FF00:: and are used for specific group communication, spanning devices within a particular scope (e.g., local link, site, organization, or global).
What is the purpose of the FF02::1 multicast address in IPv6?
It is used to send packets to all nodes on the local link.
This is a well-known multicast address that targets all IPv6-enabled devices within the local network segment.
True or False:
Multicast addresses in IPv6 are used for routing between networks.
False
Multicast addresses are used for one-to-many communication within a network, such as video conferencing, and not for routing between networks.
Fill in the blank:
The multicast address FF02::5 is used for ________.
OSPFv3 routers
FF02::5 is the multicast address used by OSPFv3 to communicate with all OSPF routers in the local scope (link-local).
What is the purpose of the solicited-node multicast address in IPv6?
It is used by NDP for MAC address resolution.
Neighbor Discovery Protocol (NDP)
The solicited-node multicast address is derived from the lower 24 bits of a device’s unicast address.
True or False:
EUI-64 format is only used for link-local addresses in IPv6.
False
EUI-64 format is used to generate the interface identifier for link-local and global unicast addresses.
What is the purpose of the Modified EUI-64 format in IPv6?
It creates a unique interface identifier by modifying the MAC address.
The MAC address is split, the 7th bit is flipped, and it is inserted into the IPv6 address to form the interface ID.
How is a modified EUI-64 address generated from a MAC address?
The MAC address is split, the 7th bit is flipped, and inserted to form the interface ID.
This process ensures a unique identifier for each interface on the network.
True or False:
IPv6 addresses are always configured manually.
False
IPv6 addresses can be automatically configured using Stateless Address Autoconfiguration (SLAAC) or assigned manually.
