Question

Why do we have some network devices that have more than one IP address?

Answer 1

A network device can have multiple IP addresses,if "Multiple Network Interface Cards" or "Network Interface Controllers"(NICs) are installed in the network.

If the network possess multiple IP addresses,then network receives multiple number of data packets from multiple sources.This situation in a network is handled by "Bottleneck".Bottleneck makes your network capable of processing large number of data packets in a given time.

Hence,if a network has "Multiple Network Interface Cards" or "Network Interface Controllers"(NICs) and Bottleneck features ,then it can possess different IP addresses.