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cisco ccna zertifikat kosten.the next header field value will indicate the type of extension header that immediately follows the IPv6 packet header. IPv6 packets can carry multiple extension headers, and the extension headers are arranged in a chained fashion. Each extension header contains a next header field that indicates whether other types of extension headers follow immediately after it. The value of the next header field of the last extension header in a chained arrangement indicates the immediately following Layer 4 protocol header (e.g., TCP header).FE00:0:0:l::56As with IPv4 addresses, the prefix length can be used to indicate the subnet of an IPv6 address. For example, for the IPv6 address 2222:11ll:0:l:A:B:C:D/64, where /64 indicates the prefix length. To determine the network ID for an IPv6 address, the process is the same as for an IPv4 address. In other words, you can take the first bits from the IPv6 address (64 bits in this case) and set the rest of the bits to zero according to the prefix length.Figure 1-69 shows the process of determining the network ID of an IPv6 address.2222:llll:0:l:A:B:C:D/64The resulting IPv6 address is the network ID. for that IPv6 address in Figure 1.69, its network ID is 2222:1111:0:1:0:0:0:0:0 or 2222:1111:0:1::./gffl IPv6 addresses are divided into the following three major categories.Anycast addresses: used to identify a group of interfaces (for example, multiple nodes' interfaces). The destination IPv6 address is an anyThe packet with the IPv6 address is usually delivered to the nearest interface identified by the address.Multicast address: used to identify a group of interfaces. When a multicast address is used, packets are typically delivered to all interfaces identified by this identifier