You can use SFP or Copper depending on the router ports. Cat cables / twisted pair cable are copper cables commonly used.

You can configure username and password pairs, which are locally stored on the switch. These pairs are assigned to lines or ports and authenticate each user before that user can access the switch. If you have defined privilege levels, you can also as...

Hi Ramesh, Latest release is Release 12.2.55-SE11, please refer mentioned download link. https://software.cisco.com/download/release.html?mdfid=279486442&softwareid=280805680&release=15.0.1-SE2

All Catalyst 6800 series line cards support CVR-4SFP10G-QSFP Adapter. Due to power limitations on line card, one port per port-group can be operated on 40G and connected to CVR-4SFP10G-QSFP Adapter. Please refer Table 10-3 40G Ports supported on port...