CCNA to SDN and NFV

If you are a ccna certified, I am sure you are good with l2 & l3 concepts. SDN(software defined Networking) decouples the control plane and data plane. you can read about ‘openflow’ protocol and start implementing small concepts.

eg:

i) you can install open source sdn controller (eg : opendaylight, onos)

ii) use mininet to simulate the end devices.

iii) write flows to forward the traffics.

check the below post for your reference :

Using the OpenDaylight SDN Controller with the Mininet Network Emulator

once you are familiar with concepts you can try for SDN certifications.

Open Networking SDN Certified Professional Program

For NFV(network function virtualization ) . you can try implementing vnf’s like brocade vyatta(vrouter) in your cloud environment.

http://mininet.org/walkthrough/
https://www.etsi.org/deliver/etsi_gs/nfv/001_099/001/01.01.01_60/gs_nfv001v010101p.pdf
https://www.sdxcentral.com/nfv-and-sdn-for-dummies/
https://searchsdn.techtarget.com/essentialguide/NFV-basics-A-guide-to-NFV-implementation-challenges-and-benefits