The entire ipv6 prefix is identified using 64 as its

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The entire IPv6 prefix is identified using /64, as it's the first 64 bits of the address. Interface ID Format 4:07-4:39 The interface ID is used to uniquely identify a particular host, and is the last part of 64 bits of the address. The interface ID can either be dynamically generated by an individual host or regenerated using the MAC address of the NIC. When using the MAC address method, because MAC addresses are 48-bit numbers, the values FFFE are inserted in the middle. So whenever you see an IPv6 address with an FFFE quartet in the middle of the interface ID, you know it was generated using a MAC address. Built-in Features 4:40-4:48 In addition to providing more addresses, IPv6 was designed to include built-in security, quality of service, and auto-configuration features. Summary 4:49-5:13 Even though IPv4 addresses have essentially run out, the transition to IPv6 will take time. This is because a lot of IPv4 devices are unable to communicate with IPv6 devices. And a lot of these devices are embedded in the Internet infrastructure. However, IPv6 addresses are used in a lot of situation,and as such, it's important to understand the characteristics and features of IPv6 addresses. IP version 6 (IPv6) was developed to address the fact that IPv4 addresses have been exhausted. The IPv6 address is a 128-bit binary number. The following list describes the features of an IPv6 address: The address is made up of 32 hexadecimal numbers, organized into 8 quartets (e.g., 35BC:FA77:4898:DAFC:200C:FBBC:A007:8973). The quartets are separated by colons. Each quartet is represented as a hexadecimal number between 0 and FFFF. Each quartet represents 16-bits of data (FFFF = 1111 1111 1111 1111). Leading zeros can be omitted in each section. For example, the quartet 0284 could also be represented by 284. Addresses with consecutive zeros can be expressed more concisely by substituting a two colons for the group of zeros. For example: o FEC0:0:0:0:78CD:1283:F398:23AB o FEC0::78CD:1283:F398:23AB (concise form) If an address has more than one consecutive location where one or more quartets are all zeros, only one location can be abbreviated. For example, FEC2:0:0:0:78CA:0:0:23AB could be abbreviated as: o FEC2::78CA:0:0:23AB or o FEC2:0:0:0:78CA::23AB o But not FEC2::78CA::23AB The 128-bit address contains two parts: Component Description Prefix The first 64 bits are known as the prefix . o The 64-bit prefix can be divided into various parts, with each part having a specific meaning. Parts in the prefix can identify the geographic region, the ISP, the network, and the subnet. o The prefix length identifies the number of bits in the relevant portion of the prefix. To indicate the prefix length, add a slash (/) followed by the prefix length number. Full quartets with trailing 0's in the prefix address can be omitted (for example 2001:0DB8:4898:DAFC:: / 64).
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