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cisco ccna zertifizierung kosten.Public Routing Prefix Subnet ID Interface IDBrickpoint <------------------------------------------------------------------------------> G bit S bit I bitFigure 1-70 Format of IPv6 Public Unicast AddressesThe first part of the IPv6 public unicast address is called the public routing prefix, which identifies the IPv6 address block assigned to the unit network.3 The second part is the subnet ID, which identifies the subnet within the IPv6 address block; the third part is the interface ID, which identifies the interface within the subnet.The public routing prefix is assigned by IANA or its delegated authority (e.g., a regional Internet registry). The unit to which the public routing prefix is assigned determines the subnet IDO :will, according to its own IP address assignment scheme. ii ii ... A local link address (LLA) is a special IPv6 unicast address with a scope limited to a particular link or awhole point of a subnet. In an IPv6 network environment, hosts must have at least one LLA per interfaceOLLAs are used for a variety of purposes, for example, to discover neighboring nodes or as the next-hop address for sending and receiving certain IPv6 traffic (instead of a public unicast address). The router should not forward any IPv6 packets containing an LLA outside the local subnet. The first 10 bits of the LLA address must be 1111111010 (FF80::/10), and the next 54 bits should be set to all zeros. i.e., the first 64 bits of the LLA address are always FE80:0000:0000:0000, followed by the interface ID determined by the EUI-64 method, which is discussed in the next section.Figure 1-71 Format of the IPv6 LLA1.7 IPv6 Basics 87up routing, while the latter's scope is limited to the local link, which IPv6 hosts use to perform special functions, such as, for example, performing neighbor discovery. The concept that an IPv6 host can have multiple IPv6 addresses on a single interface is unique to IPv6. For example, the same interface can have both an IPv6 local link address and a public unicast address. In fact, this is a common situation. According to the IPv6 specification, all interfaces of an IPv6 host should have at least one local link address.Figure 1.71 shows the format of the IPv6 LLA.