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1. Introduction
 2. Overview of network virtualization
  2.1 Benefits and overheads of network virtualization
 3. Challenges for realizing network virtualization
  3.1 Isolation
  3.2 Performance
  3.3 Scalability
  3.4 Flexibility
  3.5 Evolvability
  3.6 Management
  3.7 Security
 4. Requirements of network virtualization
  4.1 Programmability
  4.2 Topology awareness
  4.3 Quick reconfigurability
  4.4 Isolation
  4.5 Network abstraction
  4.6 Performance
  4.7 Security
  4.8 Management
  4.9 Mobility
  4.10 Wireless virtualization
 5. Applicability of network virtualization
  5.1 Experimentation on the feasibility of new network architectures [4]
  5.2. Mobility support in virtualized network
  5.3 Network virtualization for the network service provider
 6. Conclusions
 References