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ccna 200 301 cbt nuggets download.To solve an IPv6 problem well, you must remember many of the principles of how IPv6 works. Fortunately, many of the concepts of IPv6 are very similar to IPv4, but nonetheless there are some differences that make it worthwhile to spend some time reviewing IPv6. the first part of this chapter reviews many of the details of IPv6, compressing the five chapters of the ICND1 book into this short section.The first part, between the beginning of this page and the section titled "Troubleshooting IPv6," repeats the concepts discussed in the ICND1 book. If you are using both books, it is best to decide to go back and review or skip this section, as suggested below. Skip to "Troubleshooting IPv6": if you already know IPv6 well, then skip this section. For example, you may be on track with a learning plan in which you have just finished reading and still remembering the IPv6-related chapters in the ICND1 book. It is also important to note that this first section does not introduce new concepts compared to the IPv6 chapter in the ICND1 book. Read this section: If you remember only part of IPv6, then this is the section for you. Please read on! Go back and review the ICND1 book: If you haven't thought about IPv6 in a while and really can't remember anything about it, it's a good idea to review the IPv6 chapter in the ICND1 book first. So what exactly is in this section? Of course, there is also a review of IPv6 unicast addressing and sub330 Chapter 11 Troubleshooting IPv4 Routing Protocolsnetwork segmentation, and discusses host IPv6 configuration, including stateless address autoconfiguration (SLAAC) and stateful dynamic host configuration protocol (DHCP). Basic protocols (such as Neighbor Discovery Protocol (NDP)) and commands (such as ping and traceroute) are also reviewed. Router configuration for addressing and static routes is also reviewed (a review of OSPFv3 configuration is left for Chapter 17, "OSPF for IPv6").Unicast IPv6 Addressing and IPv6 SubnettingIPv6 defines two main unicast IPv6 address types. A global unicast address (globalunicast) is functionally identical to a public IPv4 address. With global unicast, a company gets a unique prefix with which all addresses in the company begin. Because all companies use a unique prefix, all addresses in the IPv6 Internet should be unique.Unique Local Unicast addresses are the same as private addresses. Enterprises are able to create a random prefix and then assign addresses that begin with that prefix. By using a unique local address, an enterprise does not have to register a prefix, and the possibility of conflicts with other corporate IP address ranges is minimal.To create a subnet using a global unicast address, the enterprise starts with a global routing prefix, the prefix assigned to the enterprise, and then splits the address structure into three parts. In the vast majority of cases, including the cases in this book and in ICND1, the prefix of the global route and the subnet portion of the address are combined to form the first half (64 bits) of the address structure. The subnet portion reserves a place for network engineers in the enterprise to number individual subnets with different values in order to uniquely identify each subnet. The empty space in the structure is then used for the 64-bit interface ID (or host field). Figure 16-1 summarizes these rules.By IANA, RIR by local workerOr the ISP setup programmer sets