Note here the emphasis is a secure/efficient infrastructure so do not just jump on any marketing bandwagon regurgitating your text-book knowledge and slap on the table “wireless” as a solution. THINK before you answer as wireless is the least secure/efficient (irrespective of any form of encryption that is peddled down your throat as marketing propaganda as those who sell you/control the encryption always have higher strength keys to decrypt any sold solution encryption) of all existing systems so that is NOT a solution here thus, Think Outside-The-Box!