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Difference between Unicast and Anycast
Unicast: An identifier for a single interface. A packet sent to a unicast address is delivered to the interface identified by that address.
Anycast: An identifier for a set of interfaces (typically belonging to dissimilar nodes). A packet sent to an anycast address is delivered to one of the interfaces identified by that address (the "nearest" one, according to the routing protocols' calculate of distance). M
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Why do we require to subtract two from number of hosts?
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Normally, we think of communications science as dealing with the contemporaneous exchange of information among distant parties. Though, many of the same techniques employed in data
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