An anycast address is similar to a unicast address but is assigned to multiple devices on the same network at the same time. When a device sends a packet to an anycast address, it is delivered to one of the devices with that address, selected based on the routing protocol's best-effort algorithm. This is useful for applications like load balancing and failover, where multiple devices provide the same service and it doesn't matter which one handles a particular request.
C. Anycast address
Anycast addresses are assigned to multiple devices, and the packet is delivered to the nearest (in terms of routing distance) of those devices. While multicast addresses are used for delivering packets to multiple devices, anycast addresses can be assigned to multiple devices on the same network, and the packet is delivered to the closest one.
An anycast address is more similar to a unicast address than a multicast address, as like a unicast an anycast can be assigned (configured) (eg DNS) on multiple devices in different geographic locations or parts of the network. Now a multicast is not a configurable address (assigned), it only sends to a group of devices on the same network.
Multicast addresses refer to the entire group of hosts in that packets will be sent to all hosts that are members of the multicast group. Anycast addresses refer to one of the group of hosts in that packets will be sent to the host that is nearest, which is useful for servers in different geographical regions that serve the same service
in the same network? examples in books are a server in New york and a server in San Francesco ....
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