Is the corporate sector ready to combat with the terrorist attack?

No they are not and since they are soft targets they would be hit time and again.

I am surprised how it is posible that there was no security in Mumbai 5 star hotel TAJ ....only 2 people entered and created havock I think if there is a will than only corporate sector can prevent itself from such attacks

There is no question that corporations will be and ARE targets. Corporations though are generally indirect casualties in the sense that their fiscal existence is harmed via physical damage to their properties and people with the flow-on effect coming thereafter. One advantage that corporations have, is found in their collective diversity. For a singular terrorist attack to destroy the financial equilibrium of an established nation, it would have to be on a massive scale and across multiple verticals instantaneously. To protect themselves as much as possible, corporations would undoubtedly be relying very heavily on strong relationships with the government forces; and would also have hefty insurance policies and offshore strategies in place as well. The only way a major corporation could be decimated in entirety in my opinion, is if they were to have all their eggs in one basket so to speak and ALL operations in a singular location. OR, if they were to encounter an attack on a massive scale that hit each and every one of their sites and operations at once. 9/11 and Mumbai are two of the most significant large scale attacks to date, yet in both instances, companies bounced back eventually. Corporate devastation is a major task!