18.1 INTRODUCTION 18.2 NETWORK DESIGN AND IMPLEMNETION PROCESS 18.3 Requirements Phase 18.4 Investigate Alternatives 18.5 Network Design 18.6 SELECTION OF EQUIPMENT AND VENDORS 18.7 PREPARATION FOR IMPLEMENTATION 18.8 IMPLEMENTATION 18.9 CUTOVER 18.10 POST-IMPLEMENTATION AUDIT 18.11 CONSIDERATION FOR WAN DESIGN