eBook1 "Sink or Swim"walks you through a challenging scenario and imparts knowledge about the use of VLAN's, trunking, switch configuration and lots of troubleshooting. This is as close as a CCNA candidate can get to a real life troubleshooting scenario.

 

"SDN and OpenFlow for Beginners with hands on labs" explains SDN and OpeFlow in the most simplistic way and then gives you the step by step guidance to make your own lab to get familiar with it.