A. Attacks are prevented by utilizing the port-security feature.
B. An end station attempts to gain access to all VLANs by transmitting Ethernet frames in the  802.1q encapsulation.
C. Configuring an interface with the switchport mode dynamic command will prevent VLAN  hopping.
D. An end station attempts to redirect VLAN traffic by transmitting Ethernet frames in the 802.1q  encapsulation.
E. Configuring an interface with the "switchport mode access" command will prevent VLAN  hopping.

A. IP routing is not enabled.
B. VTP is not configured correctly on the interfaces.
C. The command mls rp management-interface is missing.
D. The command mls rp ip must be disabled to enable the routing.