I. INTRODUCTION

II. COMPARISON WITH RELATED SURVEY ARTICLES

III. SG AND SDNS: BACKGROUND, TERMINOLOGY, AND DEFINITIONS

IV. TAXONOMY OF ADVANTAGES OF SDN-BASED SGC

V. ARCHITECTURES OF SDN-BASED SGC

VI. ROUTING SCHEMES FOR SDN-BASED SGC

VII. SECURITY AND PRIVACY IN SDN-BASED SGC

VIII. OPEN ISSUES, CHALLENGES, AND FUTURE RESEARCH DIRECTIONS

IX. CONCLUSION