Exhibit 11 SHIVA CORPORATION Computation of Net Income (Loss) Per Share(1) Three months ended Nine months ended September 27, September 28, September 27, September 28, 1997 1996 1997 1996 ------------- ------------- ------------- ------------- Weighted Average Common and Common Equivalent Shares: Weighted Average Common Shares Outstanding During the Period 29,387,230 28,581,648 29,165,388 28,317,851 Weighted Average Common Equivalent Shares - 3,324,775 - 3,181,488 ---------- ---------- ---------- ---------- 29,387,230 31,906,423 29,165,388 31,499,339 ========== ========== ========== ========== Net Income (Loss) ($2,130,000) $6,027,000 ($11,496,000) $15,341,000 Primary Net Income (Loss) Per Share ($0.07) $0.19 ($0.39) $0.49 <FN> (1) Fully diluted net income per share has not been separately presented, as the amounts would not be materially different from primary net income per share. Net loss per share excludes common equivalent shares because their effect is antidilutive.