Expanding a Cassandra cluster with one additional node: what ports need to be open?

Question

Assume a Cassandra cluster with hosts A and B. This cluster shall now be extended with another host C. Assume that Cis on a firewalled network were all packets are dropped by default.

Which ports and protocols must be opened up between C <> A and C <> B for the new node C to function properly?

Answer 1

7000 TCP (the internal communication port) Btw, take a look at this question