LAS VEGAS -- Businesses need to look at security as a military exercise and can benefit from strategies that have proved useful in battle, a former military security expert told an Interop audience this week."This is a chess match," says Barry Hensley, a retired U.S. Army colonel who was in charge of the army's global network operations and security center. He is now vice president of Dell SecureWorks' Counter Threat Unit. "Can you lock down a network? Probably not. Can you defend a network? Yes you can."ALSO FROM INTEROP: HP takes swipes at Cisco on Interop stage\u00a0He recommends using a military combat concept called observe, orient, decide and act (OODA) that can give businesses a framework for detecting attacks quickly, figuring out what to do about it, doing it and moving on to deal with the next attack. "If you can OODA before the enemy can, I believe you can defend a network," Hensley says.Enemies planning network attacks perform the same type of preparations that military commanders do before troop engagements, what he called operational preparation of the battlefield. In networking, that preparation translates into countries that are building cyber arsenals infiltrating networks in targeted countries.The purpose is to have a place from which to launch some form of attack when it is deemed an opportune moment. "You get a foothold in as many networks as possible so they can use it at the time and place of their choosing," he says.The analogy spreads outside international cyber conflicts he says. In the United Kingdom, he says, SecureWorks has had banks as customers that have departments named cyber warfare that ponder what the worst-case would be if a cyber attack occurred. The idea is for these departments to develop plans for coping with such attacks, he says.He says some attackers test out their tools against one industry to see how well it does before going after their actual targets. For example, adversaries might try a certain form of malware against a healthcare provider, but really have as a primary target a financial services business.He says he investigated a case of an attack launched from a cloud provider network against five contractors all working on the same project for the U.S. Department of Defense.Hensley says he is uncertain how malware infiltrated the target networks, but they did so with instructions to find certain files. Once they did they contacted a command and control server hosted in a cloud provider's network which downloaded HTML files instructing the malware to send the data to six Internet drop sites, two in the U.S. and four in China, where they were picked up.CISOs should perform internal penetration testing to find whether employees are engaged in attacks against their own employers, Hensley says. He cited the case of the hacker activist group Anonymous that called for a volunteer-based distributed denial-of-service attack against specified targets using a tool called Low Orbit Ion Cannon.He says a client of SecureWorks found that employees downloaded LOIC to their work PCs and let it launch distributed DoS attacks. SecureWorks notified all its other customers about the case so they could be on the lookout. "Needless to say, the people who did it were fired," he says.Read more about wide area network in Network World's Wide Area Network section.