"It's like being the preferred supplier of bread to Wal-Mart, " says Frank McQuillan, the CEO of Telecom Engineering Services.

FORBES: The Irish way

The Chinese IP address identified by the South Korean communications regulator belongs to an Internet services company, Beijing Teletron Telecom Engineering Co.

NPR: SKorea Ready For More Cyberattacks; Banks Recover

Eircom formed a wholly owned subsidiary called Service Enterprise Holdings, which took a 35% equity stake in one partner, Telecom Engineering Services, and a 30% equity stake in a new unit of Modern Networks, the other.

FORBES: The Irish way

"You're paying for reputation, " says Michael Garretson, compliance engineering manager at RadiSys, a telecom-equipment maker.

FORBES: By the Numbers