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單項選擇題

Which of the following should you enable to prevent a switch from forwarding packets with source  addresses that are outside an administratively defined group? ()

A. DAI
B. STP
C. PVLAN
D. port security

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單項選擇題

Refer to the exhibit. The switchport output in Figure 1 displays the default settings of interface  FastEthernet 0/13 on switch SW1. Figure 2 displays the desired interface settings. 
Which command sequence would configure interface FastEthernet 0/13 as displayed in Figure 2? ()

A. SW1(config-if)# switchport trunk encapsulation dot1q SW1(config-if)# switchport mode trunk  SW1(config-if)# switchport trunk native DATA SW1(config-if)# switchport trunk allowed vlan  1,10,20
B. SW1(config-if)# switchport trunk encapsulation dot1q SW1(config-if)# switchport mode dynamic  auto SW1(config-if)# switchport trunk native DATA SW1(config-if)# witchport trunk allowed vlan  add 1,10,20
C. SW1(config-if)# switchport trunk encapsulation dot1q SW1(config-if)# switchport mode dynamic  desirable SW1(config-if)# switchport trunk native vlan DATA SW1(config-if)# switchport trunk  allowed vlan 1,10,20
D. SW1(config-if)# switchport trunk encapsulation dot1q SW1(config-if)# switchport mode dynamic  desirable SW1(config-if)# switchport trunk native vlan 10 SW1(config-if)# switchport trunk allowed  vlan 1,10,20
E. SW1(config-if)# switchport trunk encapsulation dot1q SW1(config-if)# switchport mode dynamic  Desirable SW1(config-if)# switchport trunk native vlan 10

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