When installing Cisco cluster switches and downloading the appropriate RCF (Redundant Configuration File) to the switch, common file transfer protocols used are FTP (File Transfer Protocol) and SCP (Secure Copy Protocol). FTP is widely used for transferring files over a network and is commonly supported by network equipment. SCP, on the other hand, is a more secure protocol that leverages SSH to transfer files securely. HTTP and NFS are not typically used for transferring configuration files in this context.