Power of Attorney for Peter A. Shimer

This filing is an exhibit to a SEC filing, specifically a Power of Attorney granted by Peter A. Shimer, a director of Cisco Systems, Inc. (CSCO), to various individuals including Mark Patterson, Maria Victoria Wong, Deborah L. Stahlkopf, Evan Sloves, Jay Higdon, and Jeremy Erickson. The purpose of this Power of Attorney is to authorize these individuals, acting as Shimer's attorneys-in-fact, to execute and file necessary SEC forms (Forms ID, 3, 4, or 5) related to transactions in Cisco securities on Shimer's behalf. It also grants them authority to manage Shimer's EDGAR account, including appointing administrators, maintaining security, and certifying information accuracy. The Power of Attorney remains effective until Shimer is no longer required to file these forms or until it is revoked. The filing is dated April 1, 2026, with the signature executed on April 7, 2026.