多項選擇題

ISL is being configured on a Company switch. 
Which of the following choices are true regarding  the ISL protocol? ()

A. It can be used between Cisco and non-Cisco switch devices.
B. It calculates a new CRC field on top of the existing CRC field.
C. It adds 4 bytes of protocol-specific information to the original Ethernet frame.
D. It adds 30 bytes of protocol-specific information to the original Ethernet frame.


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3.單項選擇題

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?()

A. Untagged frames are automatically assumed to be in VLAN 5.
B. Untagged frames are defaulted to VLAN 1 traffic.
C. Untagged frames are dropped because all packets are tagged when dot1q trunked.
D. Untagged frames are determined on the other switch
E. Untagged frames are not supported on 802.1Q trunks.

4.多項選擇題

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? ()

A. An identical VTP mode.
B. An identical speed/duplex.
C. An identical trunk negotiation parameter.
D. An identical trunk encapsulation parameter.

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