單項選擇題

Switch R1 has been configured with the root guard feature. 
What statement is true if the spanning  tree enhancement Root Guard is enabled? ()

A. If BPDUs are not received on a non-designated port, the port is moved into the STP loop- inconsistent blocked state
B. IF BPDUs are received on a PortFast enabled port, the port is disabled.
C. If superior BPDUs are received on a designated port, the interface is placed into the root- inconsistent blocked state.
D. If inferior BPDUs are received on a root port, all blocked ports become alternate paths to the  root bride.


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1.多項選擇題

You are the network administrator tasked with designing a switching solution for the Company  network. 
Which of the following statements describing trunk links are INCORRECT?()

A. The trunk link belongs to a specific VLAN.
B. Multiple trunk links are used to connect multiple end user devices.
C. A trunk link only supports native VLAN.
D. Trunk links use 802.10 to identify a VLAN.
E. The native VLAN of the trunk link is the VLAN that the trunk uses for untagged packets.

2.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.

5.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.

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