Network Addressable Units in a SNA network are any components that can be assigned an address and can send and receive information. They are distinguished further as follows:
- System Service Control Points, provide services to manage a network or subnetwork (typically in the mainframe),
- Logical Units, a logical collection of services that can be accessed from a network.
- Physical Units, a combination of hardware and software that control the links to other nodes.
Read more about this topic: IBM Systems Network Architecture
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