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cisco ccna certification salary.Manual IPv6-over-IPv4 (6to4) tunneling technique Encapsulates IPv6 packets in IPv4 packets in an IPv4 network, tunneling them. This requires a dual-stack configuration on the routerDynamic 6to4 Tunneling Technology Enables IPv6 zones to automatically connect to other IPv6 zones over an IPv4 backbone, such as the Internet. This method uses a unique IPv6 prefix in each zone, so there is no need to obtain an IPv6 address from an address registry or ISPSite Automatic Intra-Site Tunneling Addressing Protocol (1SAIAP) tunneling technology Uses a virtual link to connect IPv6 zones within a site that primarily uses IPv4. On the border router between the two addressing types, a dual stack must be configuredTeredo Tunneling Technology Instead of using a router to transport packets through a tunnel, the host performs the tunneling. This requires hosts to be configured with dual stacks and is commonly used to transport packets that need to pass through IPv4 address translation devicesNAT Proxy and Translation (NAT-PT) Uses an address translation device to translate addresses between IPv6 and IPv4 networksDual StackIn dual-stack technology, the device runs two protocol stacks simultaneously: IPv4 and IPv6o of all the migration methods, this method is the most common. Dual stacks can be implemented on the same interface of a device or between different interfaces. The top half of Figure 23.6 shows an example of dual-stack implementation on a router, where Network A contains devices using two different protocols and the router is configured for dual-stack mode. When migrating to IPv6, IPv4 applications can still function correctly by enabling them to support new APIs for handling IPv6 addresses and IPv6 address lookups.The main disadvantage of dual-stack is that devices configured with only one stack must forward their traffic to a dual-stack device in the segment, such as a router, which in turn uses the other stack.The dual-stack device then forwards the traffic back to the current segment using the other stack. This can lead to inefficient bandwidth usage, but does the sameNetwork segments can contain devices that use different protocol stacks.