Setting this object to one of the acceptable
values initiates the requested action using the
information given in tftpHost, tftpFile,
tftpModule.
downloadConfig(2): receive configuration from
host/file
uploadConfig(3) : send configuration to
host/file
downloadSw(4) : receive software image from
host/file
uploadSw(5) : send software image to
host/file
downloadFw(6) : receive firmware image from
host/file
uploadFw(7) : send firmware image to
host/file
Setting this object to any other value results in
an error.