EMPLOYMENT AGREEMENT

Exhibit 10.41

EMPLOYMENT AGREEMENT

This Employment Agreement (this “Agreement”) is entered into as of the date of signature last affixed hereto, by and between Visual Networks Operations, Inc., a company organized under the laws of Delaware (“Visual” or the “Employer”) with its principal place of business at 2092 Gaither Road, Rockville, Maryland, and Mark B. Skurla, an individual (hereafter the “Executive”).

WITNESSETH:

WHEREAS, VISUAL desires to employ the Executive, and the Executive desires to accept such employment, on the terms and conditions set forth herein;

WHEREAS, VISUAL and the Executive shall enter into an EMPLOYEE CONFIDENTIALITY, INVENTION ASSIGNMENT AND NON-SOLICITATION AGREEMENT (“Confidentiality Agreement”), attached hereto as Exhibit A;

NOW, THEREFORE, in consideration of the mutual promises and covenants set forth herein, and for other good and valuable consideration, the sufficiency of which is hereby acknowledged, and intending to be legally bound hereby, VISUAL and Executive hereby agree as follows:

ARTICLE 1

POSITION OF EMPLOYMENT

ARTICLE 2

DUTIES, AUTHORITY AND PERFORMANCE

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ARTICLE 3

COMPENSATION AND BENEFITS

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Details of VISUAL’s insurance plans, including benefit amounts, limitations and restrictions are described in the summary plan descriptions provided to the Executive. If there is any difference between the summary plan descriptions and the information set forth in this Agreement, then the information contained in the summary plan descriptions takes precedence.

ARTICLE 4

TERMINATION OF EMPLOYMENT

4.3.2 Executive’s “Disability”, which for purposes of this Agreement means the Executive’s incapacitation by accident, sickness or other circumstances which, in the reasonable good faith determination of the Board, renders Executive mentally or physically incapable of performing the duties and services required of him hereunder in substantially the same manner and to the extent required hereunder prior to the commencement of such Disability, either with or without reasonable accommodation, on a full-time basis for a period of at least 90 consecutive days or for a period of six (6) non-consecutive months of the preceding eighteen (18) month period; or

4.3.3 For “Cause”, which for purposes of this Agreement shall mean:

4.3.3.1 The Executive has engaged in conduct which: (A) resulted in a conviction of or plea of guilty or no contest to a misdemeanor involving moral turpitude or involving the property of VISUAL; or (B) resulted in a conviction of or plea of guilty or no contest to a felony under the laws of the United States or any state or political subdivision thereof; or

4.3.3.2 The Executive: (A) commits a breach of his fiduciary duty to VISUAL or any of its affiliates; or (B) commits an act of gross negligence; or (C) engages in willful misconduct; or (D) engages in any

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transaction which the Executive knows or should have known would constitute self-dealing or a conflict of interest between the Executive and VISUAL and in which the Executive does or would receive any direct or indirect economic or pecuniary benefit without prior disclosure of such transaction to VISUAL; or

4.3.3.3. The Executive violates the internal procedures or policies of VISUAL in a manner which has an adverse effect on the reputation, business or prospects of VISUAL, such as but not limited to, conduct constituting employment discrimination or sexual harassment; or

4.3.3.4 Default or other breach by Executive of his obligations hereunder; or

4.3.3.5 Failure by Executive to perform diligently and competently his duties hereunder after written notice from VISUAL of such failure and thirty (30) days to remedy the deficiency described in such notice.

4.4.1 Termination by VISUAL Without Cause or Termination by Executive for Good Reason. If Executive’s employment hereunder shall be terminated during the Term of this Agreement: (a) by the Employer without Cause (as defined in section 4.33 above); or (b), by Executive for Good Reason (as defined in section 4.2 above), VISUAL agrees to provide Executive with severance pay, payable according to normal payroll practice, amounting to six (6) months of the Executive’s then-applicable Base Salary, less applicable withholdings (the “Severance Pay”). In exchange for this Severance Pay, Executive agrees to execute a full release of all claims arising from the termination of Employee’s employment with Visual. No severance or other payment is due until a full release has been signed by Executive to Visual’s satisfaction. In the event that Executive breaches any of the provisions of this Agreement (including but not limited to Executive’s obligation to cooperate during any relevant notice period and/or the Confidentiality Agreement), all compensation and benefits hereunder shall cease immediately, Executive’s termination shall be treated as if it had been a termination for Cause, and Executive shall be required to repay VISUAL any Severance Pay received hereunder.

4.4.2 Termination by Employer for Cause, Death or Disability. If Executive’s employment is terminated by VISUAL for death, Disability or Cause (as those terms are defined in sections 4.3.2 and 4.3.3 herein), all compensation and benefits payable hereunder shall terminate contemporaneously with the date of the Executive’s termination of employment.

ARTICLE 5

GENERAL PROVISIONS

5.1 Notices. All notices and other communications required or permitted by this Agreement to be delivered by VISUAL or Executive to the other party shall be delivered in writing to the address shown below, either personally, by facsimile transmission or by registered, certified or express mail, return receipt requested, postage prepaid, to the address for such party specified below or to such other address as the party may from time to time advise the other party, and shall be deemed given and received as of actual personal delivery, on the first business day after the date of delivery shown on any such facsimile transmission (with confirmed receipt) or upon the date or actual receipt shown on any return receipt if registered, certified or express mail is used, as the case may be.

Attention: Jill Mayer

Director of Human Resources

2092 Gaither Road

Rockville, Maryland 20850

At Executive’s address as reflected on VISUAL’s records

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5.2 Amendments and Termination; Entire Agreement. This Agreement may not be amended or terminated except by a writing executed by all of the parties hereto. This Agreement constitutes the entire agreement of VISUAL and Executive relating to the subject matter hereof, and supersedes all prior oral and written understandings and agreements, whether written or oral. Notwithstanding anything herein to the contrary, this Agreement shall not affect the applicability of the Non-Solicitation Agreement executed by Executive, and the Non-Solicitation Agreement shall remain in full force and effect notwithstanding this Agreement.

5.3 Severability; Provisions Subject to Applicable Law. All provisions of this Agreement shall be applicable only to the extent that they do not violate any applicable law, and are intended to be limited to the extent necessary so that they will not render this Agreement invalid, illegal or unenforceable under any applicable law. If any provision of this Agreement or any application thereof shall be held to be invalid, illegal or unenforceable, the parties agree and stipulate that any court of competent jurisdiction may enforce these restrictions to the maximum extent deemed reasonable, rather than declare any provision unenforceable.

5.4 Waiver of Rights. No waiver by VISUAL or Executive of a right or remedy hereunder shall be deemed to be a waiver of any other right or remedy or of any subsequent right or remedy of the same kind.

5.5 Definitions, Headings and Number. A term defined in any part of this Employment Agreement shall have the defined meaning wherever such term is used herein. The headings contained in this Agreement are for reference purposes only and shall not affect in any manner the meaning or interpretation of this Employment Agreement. Where appropriate to the context of this Agreement, use of the singular shall be deemed also to refer to the plural, and use of the plural to the singular.

5.6 Counterparts. This Agreement may be executed in separate counterparts, each of which shall be deemed an original but all of which taken together shall constitute but one and the same instrument.

5.7 Governing Law. This Agreement shall be interpreted, construed, and enforced pursuant to the laws of the state of Maryland, irrespective of its choice of laws provisions and irrespective of the fact that any one of the parties may be a resident of a different state. The parties hereto agree that, in connection with any action, suit or other proceeding in connection with, arising out of or relating to this Agreement disputes shall be resolved by the District Court of Maryland for Montgomery County, the Circuit Court for Montgomery County, Maryland, or the United States District Court for the District of Maryland, as may be appropriate. Employee agrees that service of process upon Employee may be effected by certified mail or by any other means permitted by law, and Employee waives any objection which Employee may have to the laying of venue of any such suit, action or proceeding in any such court and any claim or defense of inconvenient forum.

IN WITNESS WHEREOF, VISUAL and Executive have signed this Agreement.

VISUAL NETWORKS OPERATIONS, INC.

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