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  1. #1
    Join Date
    Jan 2012
    Location
    Greater Atlanta Area
    Posts
    2

    Question Ch 15 Review Q6 anycast

    The chapter, under "Address Types" indicates a "one-to-nearest", as well as the anycast packet being delivered to only one device.
    • The question suggests the answer as "one-to-one-of-many;" never mentioned in the chapter.

    • The book answer does suggest anycast being delivered to one device (gee, thanks

    I picked the answer as A: delivered to a single interface.
    Who's right?
    Thanks, good people

  2. #2
    Join Date
    Dec 2006
    Posts
    2,221

    Default

    Anycast is defined as one-to-many.
    However, with that said, the bottom line is that a single packet will be delivered to only one to device.
    With anycast, many servers, as an example, will have the same IPv6 unicast address. Routers will load balance on a link to these servers and deliver the packet to the nearest anycast address, but they won't deliver the packet to more than one device. The next packet might go to a different device, or the same, depending on the routers.
    This is basically a very cool load-balancing technique built inside IPv6.
    Hope this helps.
    Todd

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