If you are a linux user user you must learn how to connect to your Cisco router or switch using roll-over cable (the cable that comes with your device).
Step1 - Installing Minicom
Linux users will use application called 'minicom'. If you are Ubuntu user you can install it using either 'Synaptic Package Manager' or type in the following in your terminal window:
$ sudo apt-get install minicom
Once it is installed, you must configure the 'minicom' to communicate with the console port of your router/switch.
Step 2 - Connection to Console Port
Power up your router/switch and connect the roll-over cable to your computer's serial port (DB-9) and to the 'console' port of your router/switch (RJ-45).
Step 3 - Configure Minicom
Open your Terminal window (Applications ==> Accessories ==> Terminal) and type in:
$ minicom -s
Scroll down to 'Serial Port Setup' and hit Enter:
Choose 'A' to set up the serial port of your computer (here the first serial port is referenced as ttyS0) so it reads as highlighted below. Then hit Enter again to accept the change:
Next, press 'E' and then 'C' again to access the transmission speed and change it to '9600' value (no apostrophies). You should see values like highlighted below:
Then hit Enter twice to get back to the first screen (Pic.1)
The last thing is to save this configuration (you can choose 'dfl' to be the default template or with some other name).
If you chose 'dflp and then, 'Exit from Minicom', you can try out your work now. Type in:
and hit Enter
You should see the console prompt of your router/switch. If you want to leave the minicom use CTRL-A keystroke and then type 'x' and confirm you want to leave the application.