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## 2.1.5 Planning for network connectivity 

The z/OS Linux virtualization layer gives virtual access to the z/OS TCP/IP network through use of the virtio  Linux interface. Figure 2-9 on page 33 shows you the general overview of the zCX virtualization layer that exists inside the zCX virtual Docker server address space. 

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In Figure 2-10 on page 34 a red arrow points to the dynamic virtual IP address (DVIPA), named 10.1.2.1 for your Docker server inside a single zCX address space. This is a z/OS owned, managed, and advertised DVIPA. In contrast to a static IP address, the DVIPA allows you to restart your zCX instance on another z/OS system in your sysplex. This capability is an advantage during planned or unplanned z/OS system outages. 

