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cisco ccnp wireless dumps.Figure 1-75 shows an example of an IPv6 host learning the link-layer address information of another host with the help of NS and NA messages. The effect of sending NS and NA messages to and from Host A and Host B is equivalent to the IPv4 network environment in which92 Chapter 1 Network Protocols and Network Device Basicsthat is, processing all the data received, releasing the cache, and leaving the window size unchanged. However, if for some reason the TCP receiver is unable to process the data in the cache in a timely manner, it reduces the window size while informing the TCP sender. Take FigureNA messageThis is the very device with the IPv6 address 2345::2, and the MAC address of this machine is 0200.2222.2222Figure 1-75 IPv6 host learns link-layer address information of another host with the help of NS and NA messagesGiven the importance of NDP operation in an IPv6 network environment, and to improve security, RFC 3971 defines the Secure Neighbor Discovery (SeND) protocol. RFC 3971 defines two types of ND messages for the SeND protocol, Certified Path Request (CPS) messages and Certified Path Answer (CPA) ------------------------------------------------------ additional ND options and an additional auto-configuration mechanism.Once you understand how NDP works, the SLAAC process is much easier to understand. This example assumes that the host uses the EUI-64 method to generate the LLAO As soon as the LLA is generated, the host can establish IPv6 connectivity with neighboring devices on the local link.At this point, the host can either receive RA messages from the neighboring router or proactively send RS messages for the neighboring router to reply with RA messages. The RA message contains network prefix and prefix length information that can be used by the host to generate a public unicast IPv6 address.While the prefix portion of the public IPv6 address is taken from the information contained in the RA message, the interface ID portion is generated by the host using EUI-64 or other methods (which can be randomly generated). The exact method used to generate the interface ID depends on how the host's SLAAC is implemented. For example, a host can implement both Privacy Extensions (defined in RFC 4941) and, with SeND enabled, Cryptographically Generated Address (CGA). determine if the address to be assigned conflicts with any other IP addresses in use by the host.