Which of the following trunking modes are unable to request their ports to convert their links into  trunk links？  （）

If you were to set up a VLAN trunk over a Fast Ethernet...

单项选择题

If you were to set up a VLAN trunk over a Fast Ethernet link on switch R1， 
which trunk mode  would you set the local port to on R1 if you wanted it to respond to requests from its link partner  （R2） and become a trunk？ （）

You are the network administrator at Company and switch...

单项选择题

You are the network administrator at Company and switch R1 is configured as shown below：  Interface gigethernet 0/1  Switchport mode trunk  
Switchport trunk encapsulation dot1q  Switchport trunk native vlan 5  
If untagged frames are arriving on interface gigethernet 0/1 of R1， 
which of the following statement  are correct？（）

If you were to configure an ISL Ethernet trunk between ...

多项选择题

If you were to configure an ISL Ethernet trunk between two Cisco switches， named R1 and R2，  
what would you have to include at the end of the link for the trunk to operate correctly？ （）