Port security
SNMP
Spanning Tree Protocol (STP)
Firewall
Port security
To provide high-speed backbone connections
Distribution layer
Router
Scalability and the number of ports
SDN control plane
SDN service layer
Centralized control and policy management
SNMP (Simple Network Management Protocol)
FCoE (Fibre Channel over Ethernet)
Performance and resource efficiency
Host-only network
Reduced complexity in network configuration
Vulnerabilities in hypervisors or management interfaces
Network Function Virtualization (NFV)
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