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What is a "storage node"?: An Object Storage node that provides container services, account services, and object services; controls the account databases, container databases, and object storage.

What is a "compute node"?: A node that runs the nova-compute daemon that manages VM instances that provide a wide range of services, such as web applications and analytics. it usually manages to run servers on kvm, xen, vmware, docker and other hypervisors.

What is a "network node"?: Any compute node that runs the network worker daemon. it usually manages ip addresses, virtual routers, firewalls, subnets and so on... it provides "infrastructure programmability" and Infrastracture as a service, firewall as a service, vpn as a as a service and so on...

and SURPRISE: there is a glossory to find definition of terms in openstack culture: https://docs.openstack.org/doc-contrib-guide/common/glossary.html