单项选择题

Refer to the exhibit. Based on the information given. Which switch will be elected root bridge and why?（）

A.Switch A ,because it has the lowest MAC address
B.Switch C,because it has the lowest priority
C.Switch B,because it has the highest MAC address
D.Switch C,because it is the most centrally located switch
E.Switch A,because it is the most centrally located switch
F.Switch D,because it has the highest priority

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多项选择题

For what two purposes does the Ethernet protocol use physical addresses? （）

A.to uniquely identify devices at Layer 2
B.to allow communication with devices on a different network
C.to differentiate a Layer 2 frame from a Layer 3 packet
D.to establish a priority system to determine which device gets to transmit first
E.to allow communication between different devices on the same network
F.to allow detection of a remote device when its physical address is unknown

多项选择题

Which destination addresses will be used by Host A to send data to Host C?（）

A.the IP address of Switch 1
B.the MAC address of Switch 1
C.the IP address of Host C
D.the MAC address of Host C
E.the IP address of the router's E0 interface
F.the MAC address of the router's E0 interface

单项选择题

Where does routing occur within the DoD TCP/IP reference model?（）

A.application
B.internet
C.network
D.transport