多项选择题
A. An end station attempts to gain access to all VLANs by transmitting Ethernet frames in the 802.1q encapsulation.
B. Configuring an interface with the "switchport mode dynamic" command will prevent VLAN hopping.
C. Attacks are prevented by utilizing the port-security feature.
D. Configuring an interface with the "switchport mode access" command will prevent VLAN hopping.
E. An end station attempts to redirect VLAN traffic by broadcasting multiple ARP requests.
多项选择题 The Company security administrator wants to prevent VLAN hopping on the network. What is one method that can be used to do this？ （）
多项选择题 The Company security administrator is concerned with VLAN hopping based attacks. Which two statements about these attacks are true？ （）
单项选择题 Refer to the exhibit. PCs in VLAN 2 are not able to communicate with PCs in VLAN 3. What could be the cause？（）