The proud boss saw his side claim their biggest-ever success against their county rivals with a five-star showing.
Posh took charge with three goals in the space of six minutes late in the first half as Ephron Mason-Clark's 34th and 37th minute double was soon followed by a deflected Kwame Poku strike.
Any thoughts of a Cambridge comeback were dismissed when Poku pounced again early in the second period following an Archie Collins-led counter-attack before Liam Bennett headed a Joel Randall cross into his own net to pile on more misery for Mark Bonner's men.
"That is as perfect as it is ever going to get," enthused Ferguson. "There was not one bad performance from anyone in my team.
"The players stuck to the tactical plan to the 'T' so I'm absolutely delighted and all credit to them for that.
"Cambridge are a good team without the ball. They do not concede many goals and no-one has done that to them.
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