... Rate, and it's the minimum guaranteed bandwidth, and MIR means Maximum Information Rate, and it's the maximum bandwidth a user can get. We will show in this example how to make bandwidth ... rewalls. Designing and Implementing the Firewalls Due to the fact that all the servers run Linux, they will all have their own rewall. However, the main rewall is on the core router, and so ... 'control' port and a 'data' port. FTP runs only on TCP, and by standard, it uses port 21 (FTP) for control (connecting and issuing commands to the server) and port 20 (FTP data)...