Unlawful Border Entry Prevention Act of 2011 - Amends the Illegal Immigration Reform and Immigrant Responsibility Act of 1996 to authorize the Secretary of Homeland Security (DHS) to construct an additional 350 or more miles of reinforced fencing along the southwest border.
Prohibits fencing or any other similar physical infrastructure along the southwest border in existence on December 31, 2010, from being considered in meeting such mileage requirement.
Requires the Secretary to submit a plan to Congress to gain operational control of any sector of the southwest border in which there has been a 40% increase over the preceding fiscal year of DHS apprehensions of individuals unlawfully entering the United States.