Lets take a look at the common Protection Mechanism or Protection controls defined common characteristics of security controls. Please remember, Not all security controls have all of them, but many have them.

Also, I was having difficulty to understand the Abstraction concept; Special Thanks to Ravikumar for explaining me Abstraction with Real world example e.g. Cisco SDA solution (Data Traffic is abstracted from Physical underlying infrastructure), AP – WLC joining via CAPWAP( Wireless Client traffic is abstracted within CAPWAP tunnel all the way to Wireless LAN controller irrespective of underlying infrastructure)  etc.