Home > Storage > ObjectScale and ECS > Product Documentation > Dell ECS: Networking Best Practices > Traffic types
Understanding the traffic types within ECS and the customer environment is useful for architecting the network physical and logical layout and configuration for ECS.
The public network carries the following types of traffic:
In a single-site, single-rack deployment, internode traffic stays within the ECS rack switches. Alternately, in single-site, multirack deployment, internode traffic traverses from one rack set of switches up to the customer switch and to the other rack switches to process requests. In a multisite or geo-replicated deployment, all the above traffic will also go across the WAN.
Note: The internode traffic of EXF900 running in a private network due to the NVMe-oF architecture of EXF900.
The private network, which is under Dell control, is entirely for node and switch maintenance and thus traffic types include: