Which IPv6 address type provides communication between subnets and cannot route on the Internet?
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A. B. C. D.B
A IPv6 Unique Local Address is an IPv6 address in the block FC00::/7. It is the approximate IPv6 counterpart of the IPv4 private address. It is not routable on the global Internet.
Note: In the past, Site-local addresses (FEC0::/10) are equivalent to private IP addresses in IPv4 but now they are deprecated.
Link-local addresses only used for communications within the local subnet. It is usually created dynamically using a link-local prefix of FE80::/10 and a 64-bit interface identifier (based on 48-bit MAC address).
The correct answer is B. unique local.
IPv6 address types can be categorized into three types: unicast, multicast, and anycast. Unicast addresses are used to identify a unique interface on a network, multicast addresses are used to send traffic to a group of interfaces, and anycast addresses are used to identify a group of interfaces that share the same IP address.
IPv6 unique local addresses (ULA) are a type of IPv6 unicast address that provide communication between subnets and cannot route on the Internet. These addresses are also known as site-local addresses or private addresses, similar to IPv4 private addresses.
The range of IPv6 unique local addresses is fc00::/7, which means that the first seven bits of the address are fixed to the value of 1111 110. The next 40 bits are randomly generated, providing a total of 2^40 (approximately 1 trillion) unique local addresses. The remaining 16 bits are reserved for the subnet ID.
Unique local addresses are designed to be used within a single organization or site, and they are not routable on the public Internet. This means that packets with ULA addresses are dropped by routers outside the local network. They can be used for communication between subnets within an organization or for private addressing within an enterprise network.
Link-local addresses (answer A) are another type of IPv6 unicast address that are used for communication within a single link or network segment. They have a range of fe80::/10 and cannot be used for communication outside the local network segment.
Multicast addresses (answer C) are used for sending traffic to a group of interfaces that are interested in receiving the traffic. They have a range of ff00::/8 and can be used for communication within a local network or across multiple networks.
Global unicast addresses (answer D) are another type of IPv6 unicast address that are used for communication on the public Internet. They have a range of 2000::/3 and are globally routable on the Internet.