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Mr. Doyle said the new regulations were nothing more than “putting a cop on the beat to make sure the Internet really is open.”

The ranking Democrat on the panel, Rep. Anna G. Eshoo of California, said the new regulations have broad support across the technology sectors of the American economy, including backing from the broadband service providers who would be, presumably, most affected by the rules.

“If it’s good enough for AT&T and Comcast, it ought to be good enough for you,” Ms. Eshoo told her Republican colleagues.

The hearing was one of the first of what is likely to be a common theme in the 112th Congress, with the new House GOP majority and the expanded Republican minority in the Senate aggressively challenging policies and regulations approved during the first two years of the Obama administration.