How many transport mechanism are there?

Ans:a) File Level Transport - Files are exported and imported into SAP XI OS level folders of development and QA respectively. This is relatively easy as there is no need of setting up any additional software's but its risky as the process is not automated as the files have to be FTP'ed from development to QA XI boxes and any failure of the transport cannot be tracked and audit logs will not be available.
b). Change Management System (CMS): This is a GUI based tool, which has to be installed on the XI box for providing the user-friendly browser which is used for automating the transport mechanism and tracking any transport failures. However there is an initial level effort for setting up the CMS and stabilizing it.