Like a WSFC, Pacemaker would prefer redundant networking, meaning distinct network cards (NICs or pNICs for physical) having individual IP addresses. In terms of the cluster configuration, each IP address would have what is known as its own ring. However, as with WSFCs today, many implementations are virtualized or in the public cloud where there is really only a single virtualized NIC (vNIC) presented to the server. If all pNICs and vNICs are connected to the same physical or virtual switch, there is no true redundancy at the network layer, so configuring multiple NICs is a bit of an illusion to the virtual machine. Network redundancy is usually built into the hypervisor for virtualized deployments, and is definitely built into the public cloud.
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