In the RPC chapter, Protobuf is mentioned as one of the popular RPC framerworks.
Protobuf is actually a serialization mechanism that can indeed be used with a RPC framework such as gRPC, originated by Google, as is Protobuf.
I suggest replacing the sentence :
In the RPC chapter, Protobuf is mentioned as one of the popular RPC framerworks. Protobuf is actually a serialization mechanism that can indeed be used with a RPC framework such as gRPC, originated by Google, as is Protobuf. I suggest replacing the sentence :
with