Cisco is one network device manufacturer, Have their own certification system:CCNA,CCNP,CCIE. 3anetwork.com is a one of  leading Cisco products distributor.

I got one blog about mac-address, I think this will help you.

http://cisco3750x.weebly.com/1/post/2014/01/cisco-switch-mac-addresses.html

When you see the  datasheet of switch, if you see that it has IEEE 802.3af Standards, it means that this switch supports POE that can supply power for small device like AP,telephone with RJ45 port.

For example,this switch has the POE function:

http://www.3anetwork.com/cisco-ws-c3750x-24t-s-price_p102.html