Update network-configuration.md

Altinity · Mar 2, 2022 · f29f8fb · f29f8fb
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 ### **Networking And Server Room Planning**
 
-The network used for your ClickHouse cluster should be a fast network, ideally 10 Gbit. ClickHouse nodes generate a lot of traffic along with the Zookeeper connections and inter-Zookeeper communications.
+The network used for your ClickHouse cluster should be a fast network, ideally 10 Gbit or more.
+ClickHouse nodes generate a lot of traffic to exchange the data between nodes (port 9009 for replication, and 9000 for distributed queries).
+Zookeeper traffic in normal circumstanses is moderate, but in some special cases can also be very significant.
 
 For the zookeeper low latency is more important than bandwidth.