0000891618-99-005610 S-3/A 4 19991209 CISCO SYSTEMS INC 0000858877 3576 770059951 CA 0731 S-3/A 33 333-89893 99771654 170 WEST TASMAN DRIVE SAN JOSE CA 95134-1706 4085264000 225 WEST TASMAN DRIVE SAN JOSE CA 95134-1706 S-3/A 1 000089161899005610-001-seq1-s-3-a.txt AMENDMENT #1 TO FORM S-3 EX-2.1 2 000089161899005610-002-seq2-ex-2-1.txt AGREEMENT OF MERGER WITH SENTIENT NETWORKS EX-5.1 3 000089161899005610-003-seq3-ex-5-1.txt OPINION OF BROBECK, PHLEGER & HARRISON LLP EX-23.1 4 000089161899005610-004-seq4-ex-23-1.txt CONSENT OF PRICEWATERHOUSECOOPERS LLP