EXHIBIT 3.1

CERTIFICATE OF AMENDMENT

OF

AMENDED AND RESTATED CERTIFICATE OF INCORPORATION

OF

JUNIPER NETWORKS, INC.

Juniper Networks, Inc., a corporation organized and existing under the laws of the State of Delaware, hereby certifies as follows:

FIRST: The name of the corporation is Juniper Networks, Inc. The corporation was originally incorporated under the same name and the original Certificate of Incorporation of the corporation was filed with the Secretary of State of the State of Delaware on September 10, 1997.

SECOND: Pursuant to Section 242 of the General Corporation Law of the State of Delaware, this Certificate of Amendment to the Amended and Restated Certificate of Incorporation amends the provisions of the Amended and Restated Certificate of Incorporation of the corporation.

THIRD: The terms and provisions of this Certificate of Amendment to the Amended and Restated Certificate of Incorporation have been duly adopted in accordance with Section 242 of the General Corporation Law of the State of Delaware by the Board of Directors and the stockholders of the corporation.

FOURTH: ARTICLE SEVENTH of the Amended and Restated Certificate of Incorporation of the corporation is hereby amended to read in its entirety as follows:

The management of the business and the conduct of the affairs of the Corporation shall be vested in its Board of Directors. The number of directors which shall constitute the whole Board of Directors shall be designated in the Bylaws of the Corporation.

Each director shall be elected to hold office for a one-year term expiring at the next annual meeting of stockholders; provided, however, no terms in effect prior to the effective date of this amendment shall be shortened.

Notwithstanding the foregoing, however, subject to the rights of the holders of any series of Preferred Stock then outstanding, (i) at the 2013 annual meeting of stockholders, the directors whose terms expire at that meeting shall be elected to hold office for a one-year term expiring at the 2014 annual meeting of stockholders, (ii) at the 2014 annual meeting of stockholders, the directors whose terms expire at that meeting shall be elected to hold office for a one-year term expiring at the 2015 annual meeting of stockholders, and (iii) at the 2015 annual meeting of stockholders and each annual meeting of stockholders thereafter, all directors shall be elected to hold office for a one-year term expiring at the next annual meeting of stockholders.

Notwithstanding the foregoing provisions of this Article, each director shall serve until his or her successor is duly elected and qualified or until his or her death, resignation, or removal. No decrease in the number of directors constituting the Board of Directors shall shorten the term of any incumbent director.

Any vacancies on the Board of Directors resulting from death, resignation, disqualification, removal, or other causes shall be filled by either (i) the affirmative vote of the holders of a majority of the voting power of the then-outstanding shares of voting stock of the Corporation entitled to vote generally in the election of directors (the “Voting Stock”) voting together as a single class; or (ii) by the affirmative vote of a majority of the remaining directors then in office, even though less than a quorum of the Board of Directors. Newly created directorships resulting from any increase in the number of directors shall, unless the Board of Directors determines by resolution that any such newly created directorship shall be filled by the stockholders, be filled only by the affirmative vote of the directors then in office, even though less than a quorum of the Board of Directors. Any director elected in accordance with the preceding sentence shall hold office for the remainder of the full term of the class of directors in which the new directorship was created or the vacancy occurred and until such director’s successor shall have been elected and qualified.

The affirmative vote of sixty-six and two-thirds percent (66-2/3%) of the voting power of the then outstanding shares of Voting Stock, voting together as a single class, shall be required for the adoption, amendment or repeal of the following sections of the Corporation’s Bylaws by the stockholders of the Corporation: 2.2 (Annual Meeting) and 2.3 (Special Meeting).

No action shall be taken by the stockholders of the Corporation except at an annual or special meeting of the stockholders called in accordance with the Bylaws.

Any director, or the entire Board of Directors, may be removed from office at any time (i) with cause by the affirmative vote of the holders of at least a majority of the voting power of all of the then-outstanding shares of the Voting Stock, voting together as a single class; or (ii) without cause by the affirmative vote of the holders of at least sixty-six and two-thirds percent (66-2/3%) of the voting power of all of the then-outstanding shares of the Voting Stock.

Signature Page Follows

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IN WITNESS WHEREOF, the corporation has caused this Certificate of Amendment of Amended and Restated Certificate of Incorporation to be executed by the undersigned duly authorized officer, effective as of May 22, 2012.

JUNIPER NETWORKS, INC.

By: /s/ Kevin Jonson       
Kevin Johnson
Chief Executive Officer

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