Suggested Answer:E🗳️
Section: Addressing and Routing Protocols in an Existing Network Explanation
The IP version 6 (IPv6) prefix FF00::/8 is used for multicast addresses, which are used for one-to-many communication. IPv6 addresses in the FF00::/8 range begin with the characters FF00 through FFFF. However, certain address ranges are used to indicate the scope of the multicast address. The following IPv6 multicast scopes are defined: ✑ FF01::/16 node-local ✑ FF02::/16 link-local ✑ FF05::/16 site-local ✑ FF08::/16 organization-local ✑ FF0E::/16 -global IPv6 hosts use the multicasting capabilities of the Neighbor Discovery (ND) protocol to discover the link layer addresses of neighbor hosts. The Hop Limit field is typically set to 255 in ND packets that are sent to neighbors. Routers decrement the Hop Limit value as a packet is forwarded from hop to hop. Therefore, a router that receives an ND packet with a Hop Limit value of 255 considers the source of the ND packet to be a neighbor. If a router receives an ND packet with a Hop Limit that is less than 255, the packet is ignored, thereby protecting the router from threats that could result from the ND protocol's lack of neighbor authentication. The IPv6 prefix 2000::/3 is used for global aggregatable unicast addresses. IPv6 addresses in the 2000::/3 range begin with the characters 2000 through 3FFF. Global aggregatable unicast address prefixes are distributed by the Internet Assigned Numbers Authority (IANA) and are globally routable over the Internet. Because there is an inherent hierarchy in the aggregatable global address scheme, these addresses lend themselves to simple consolidation, which greatly reduces the complexity of Internet routing tables. The IPv6 prefix FE80::/10 is used for unicast link-local addresses. IPv6 addresses in the FE80::/10 range begin with the characters FE80 through FEBF. Unicast packets are used for one-to-one communication. Link-local addresses are unique only on the local segment. Therefore, link-local addresses are not routable. An IPv6capable host typically creates a unicast link-local address automatically at startup. Unicast link-local addresses are used for neighbor discovery and for environments in which no router is present to provide a routable IPv6 prefix. The IPv6 prefixes FC00::/8 and FD00::/8 are used for unicast site-local addresses. IPv6 addresses in these ranges begin with the characters FC00 through FDFF. Site-local addresses are not globally routable, but they are routable within an organization. Reference: Cisco: Cisco Security Appliance Command Line Configuration Guide, Version 8.0: Multicast Address
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