Anycast is a process for routing network traffic where the sender delivers packets to a destination that is nearest to it in terms of network topology.
A logical topology is a concept in networking that defines the architecture of the communication mechanism for all nodes in a network. Using network equipment such as routers and switches, the logical topology of a network can be dynamically maintained and reconfigured.
Logical topologies contrasts with physical topologies, which refer to the physical interconnections of all devices in the network.
The logical topology defines how the data should transfer. Contrast this to the physical topology, which consists of the layout of cables, network devices and wiring.
Two of the most common logical topologies are:
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