Hi, what's a password on the router Cisco Catalyst 2960 default?

The Cisco Catalyst 2960-XR switch models have the following additional capabilities in addition to the features in the Cisco 2960-X models:
Dual-FRU power supply with integrated fan
Layer 3 features with IP Lite feature set
Configurable 8 queues per port (standalone)
48 Ether channel groups
http://www.3anetwork.com/search/2960x

Yes they do support stacking. Here is the info sheet.


Cisco Catalyst 2960 Series Switches Products Services

The Cisco Catalyst 2960-48PST-L can support 48 PoE ports with total PoE power output capacity at 370W. Taking advantage of Cisco Catalyst Intelligent Power Management, the Cisco Catalyst 2960-48PST-L configuration can deliver the necessary power to support 24 ports at 15.4W, 48 ports at 7.7W, or any combination in between.

The Cisco Catalyst 2960-24PC-L can support 24 simultaneous full-powered PoE devices at 15.4W for maximum powered-device support.

The Cisco Catalyst 2960-24LT-L can support eight PoE devices at 15.4W
Cisco Catalyst 2960 Switches for the details

2960-X is manual configurable and 2960-S is smart dont need to configure.

You can only reset password this way:
1.
Attach a terminal or PC with terminal emulation (for example, Hyper Terminal) to the console port of the switch.
Use the following terminal settings:

• Bits per second (baud): 9600
• Data bits: 8
• Parity: None
• Stop bits: 1
• Flow Control: Xon/Xoff

2.Unplug the power cable.
3. Hold down the mode button located on the left side of the front panel, while you reconnect the power cable to the switch
4. Release the Mode button when the SYST LED blinks amber and then turns solid green. When you release the Mode button, the SYST LED blinks green.
5. switch: flash_init
6. switch: load_helper
7. switch: dir flash:
8. switch: rename flash:config.text flash:config.old
Rename config.text to config.old. In that file the password is stored.
9. switch: boot
10. Enter "n" at the prompt to abort the initial configuration dialog
11. Type en to enable
12. Switch#rename flash:config.old flash:config.text
13. Switch#copy flash:config.text system:running-config
14. Overwrite the current passwords:
conf term
enable secret <new pass>
enable password <new pass>
line vty 0 15
password <new pass>
login
line con 0
password <new pass>

15. write memory
16. copy run start

Cisco switches dont have a default password.
You will have to perform a password recovery process that is quite extensive.
You need to console into the switch using hyperterminal or teraterm and follow these instructions located at: http://www.cisco.com/en/US/products/hw/switches/ps628/products_password_recovery09186a0080094184.shtml

The Cisco 2960 has a life time warranty. Contact the seller and they should be able to get the switch exchanged at no cost.