Expansion of cloud services and mobile networks could create additional targets for DDoS attacks. While firewalls, intrusion protection and other devices can mitigate low-level attacks, large volumetric attacks can be an issue as these may be unable to separate legitimate from illegitimate traffic.

Networks of 'zombie' computers are flourishing across the world, and India is one of the most-infected countries.

About 25 per cent of bot-infected computers in India were located in tier-II cities, according to last year's Symantec Internet Security Threat Report XVII.

While organizations need to engage with their Internet Service Provider (ISP) and invest in solutions, consumers also need to ensure that their security solution is updated to prevent such attacks, Symantec said.

According to security solutions provider Symantec, in the late 1990s, networks of zombie machines were used to knock websites offline, making them unusable for customers - often preventing e-commerce.

In 2007, internet in Estonia was shut down due to attacks through botnet. Georgia was severely disabled by botnets in 2008.

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