If your business is pursuing a bring-your-own-device (BYOD) strategy, effective network management and security becomes critical. How can you ensure resources are accessible to staff who need them but not vulnerable to attack? The answer could lie in an often-maligned technology: network access control (NAC).
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As Gartner analyst Lawrence Orans pointed out during a recent presentation in Sydney, NAC first found favour around 2003 as a potential means of dealing with worm-based network attacks. While relatively few businesses adopted it for that reason, it does have potential as a means of securing business apps and content in a non-device dependent fashion.
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“We can use the network to get some control over this BYOD environment,” Oran said. Some sort of strategy is needed: “We are losing control. For $500 you can buy a very nice tablet; for $300 you can buy a very nice smartphone. People bring them to the office, and we’re at a loss how to manage this scenario.”
“BYOD makes a lot of us very nervous. It makes network managers nervous because they like to know what’s on the network. That’s directly related to network stability. Rogue devices disrupt network stability.”
Oran notes there are three potential solutions for BYOD management: mobile device management via agents, using hosted virtual desktops and VDI, or implementing network access control to ensure only patched and secure devices are allowed to connect. Those aren’t mutually exclusive options; many businesses will implement all three, though this will often be piecemeal. For instance, data loss prevention software for tablets is still rarer, Oran noted.
The fact the NAC is also less common in part reflects the fact that initial implementations aimed at protecting against worm attacks weren’t effective. “NAC was much more complicated and expensive to implement than we anticipated,” Oran said. “NAC languished, and the threat landscape changed.”
“NAC in many years has received a black eye through the years. NAC is all about policies .What has changed over time is that the policies have changed.”
A related issue is that ‘traditional’ NAC vendors haven’t necessarily responded to the BYOD opportunity. “In the pre-BYOD era, endpoint protection platform vendors had a good angle for NAC. Now that people are bringing in tablets and smartphones, those vendors don’t call the shots the way that they used to.” An unpredictable range of devices also means varying support for standards: “Now that it’s not an all-Windows worlds, standards have taken a step back.”
Using a NAC allows the creation of a Limited Access Zone (LAZ), which sits halfway between a traditional network and an IP-only guest network (used for Wi-Fi access for visitors). With an LAZ, connections require credentials, but don’t offer access to full management features. Gartner predicts that 60 per cent of large enterprises will use some form of LAZ by 2016.
It’s not a simple approach; Oran cited one company that spent $130,000 and took 18 months to implement an NAC system. But in larger environments where a strict policy needs to be in place, it can be an effective solution.
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