Extreme Networks (EXTR) 10-Q 2005 Q1 Quarterly report

EXHIBIT 32.2

CERTIFICATION OF WILLIAM R. SLAKEY AS CHIEF FINANCIAL OFFICER, PURUSANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Extreme Networks, Inc. (the “Company”) on Form 10-Q for the period ended September 26, 2004, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, William R. Slakey, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ WILLIAM R. SLAKEY

William R. Slakey

Chief Financial Officer

November 4, 2004

42