Wireshark is a well known utility that offers snooping on all kinds of network protocols. You can use it to dissect Scylla’s internal protocol, including reading and writing rows, exchanging schema information, gossiping and repairs.
Thrift is the original Cassandra protocol. It’s a software framework for back-end services developed at Facebook, and now an Apache project. New Cassandra applications use the CQL query language, but because Thrift was heavily used in Apache Cassandra’s early years, several important integrations depend on it. Some examples are: