SAN JOSE -- Bolstered by a nearly $1 billion tax windfall, networking giant Cisco Systems (CSCO) handily beat Wall Street's expectations Wednesday with its latest earnings report.

The company said it earned $3.1 billion on sales of $12.1 billion for its second fiscal quarter, or 59 cents per share.

Analysts surveyed by Thomson Reuters generally had expected San Jose-based Cisco to earn 40 cents per share on sales of $12 billion.

Compared to the same period a year ago, sales were up 5 percent and profit rose 44 percent. But the company said the profit increase partly reflected a $926 million tax bonus stemming from a settlement with the U.S. Internal Revenue Service and reinstatement of the federal research and development tax credit.

Following the report after the market's official close, Cisco's shares fell 39 cents, or nearly 2 percent, to $20.75 in after-hours trading. Although the company has seen a big run-up in its stock price over the last three months, that will probably level out over the next few months, predicted Bill Kreher, an analyst with Edward Jones.

"There is still a lot of uncertainty" concerning some of the markets Cisco serves, he said, adding that Europe's economy "continues to be a drag."

Nonetheless, Cisco CEO