How can I download/upload files between a remote machine and a CS department Unix machine?
Use secure FTP, which is included with any SSH client. Either type sftp sri.cse.iitd.ac.in from your UNIX/Linux machine, or use the Secure File Transfer feature included with your Windows SSH client (both available free for academic use from http://www.ssh.com). Traditional FTP has been disabled on all except one machine on the Computer Science subnet. If you have to use FTP, then connect to sri.cse.iitd.ac.