By Saumya Vaishampayan And Chris Dieterich 

The Dow Jones Industrial Average rose on Monday, but technology stocks suffered sharp losses as investors backed away from the market's riskiest segments.

Cautious trading started a news-heavy week that will bring fresh commentary from the Federal Reserve, the closely watched public debut of Alibaba Group Holding Ltd. and a potentially market-moving vote on Scottish independence.

The Dow Jones Industrial Average rose 43 points, or 0.3%, to 17033, while the S&P 500 index fell less than one point, or 0.1%, to 1985.

Upbeat trading in the broad market masked sharp declines in tech stocks and shares of small companies. The tech-oriented Nasdaq Composite index dropped 51 points, or 1.1%, to 4518, while the Russell 2000 index of small-cap stocks dropped 11 points, or 1%, to 1149.

Traders said disproportionate selling in these riskier corners of the market revealed a desire to gird for potential changes to Fed policy, as well as to cash out of winning bets.

Some said the drop in tech was in part because of large money managers raising cash to make room for Alibaba Group, which is slated to debut Friday on the New York Stock Exchange in what could be the world's largest initial public offering. Amazon.com fell 2.7%, while Facebook tumbled 3.9% in the absence of corporate news.

Traders said the main focus for investors this week is the two-day Federal Reserve policy meeting, which wraps up Wednesday and includes a news conference from Fed Chairwoman Janet Yellen.

The central bank is poised to wind down its monthly asset-purchase program in October and raise the interest rate sometime next year. Greater clarity on the path of U.S. interest rates this week likely would determine the stock market's direction in the short term, traders said.

The S&P 500 last week suffered its first weekly decline since early August, while U.S. Treasury bonds suffered their biggest weekly selloff in a year, evidence of interest rate worries.

"It's logical for the market to take a pause," said Bill Nichols, head of U.S. equities at Cantor Fitzgerald. "The question is by how much and when will the Fed raise rates, and what the market's reaction will be when it happens." Ralph Segall, co-founder and chief investment officer of Chicago's Segall Bryant & Hamill, which manages $9.8 billion in stocks and bonds, said his firm has had a hard time this year finding stocks to buy at reasonable prices. In many cases, he says, he is waiting for stocks he likes to go down before stepping in.

A prime concern is that the market looks vulnerable to a shock as the Fed unwinds its stimulus efforts, he said. "They've got a tiger by the tail, and I have no idea how I would let go," Mr. Segall said, referring to Fed policy makers. "There is a large amount of complacency," he said, noting that the market has been mostly coasting higher this year without seeing major declines. On Monday, bond buyers sent the 10-year yield down to 2.589% from 2.612% late Friday. Treasury yields rise as prices fall.

On the economic front, August industrial production fell 0.1% from the prior month, marking the first decline since January. Separately, data showed factory activity in the New York area jumped to its highest since late 2009, though the outlook for hiring waned, according to the New York Fed's Empire State index. European and Asian markets reacted to data showing a slowdown in Chinese industrial production in August. Hong Kong and Australian stocks fell, and Europe, the Stoxx Europe 600 Index inched down 0.1%

Many investors are focused on a vote Thursday that will determine whether Scotland should break its more than 300-year union with England, a move that would usher in economic uncertainty.

Corporate deals also attracted attention on Monday. Microsoft Corp. agreed to buy Mojang AB, the Swedish company behind the videogame "Minecraft," for $2.5 billion. Shares of Microsoft fell 1.1%.

Cognizant Technology Solutions Corp. said it agreed to buy privately held TriZetto Corp., which provides information technology and other services to health-care companies, for $2.7 billion in cash. Cognizant shares slipped 0.9%.

Anheuser-Busch InBev NV is in talks with banks about financing a deal to buy SABMiller PLC, The Wall Street Journal reported. The deal between the world's largest brewing companies could be worth roughly GBP75 billion ($122 billion). That news comes after Heineken NV said it rejected a takeover approach from SABMiller. U.S.-listed shares of Anheuser-Busch rose 3.3%.

In commodity markets, crude-oil futures added 0.7% to settle at $92.92 a barrel. Gold futures rose 0.3% to settle at $1,233.60 a troy ounce.

Write to Saumya Vaishampayan at saumya.vaishampayan@wsj.com and Chris Dieterich at chris.dieterich@wsj.com

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