单项选择题

Which switch would STP choose to become the root bridge in the selection process?（）

A.32768: 11-22-33-44-55-66
B.32768: 22-33-44-55-66-77
C.32769: 11-22-33-44-55-65
D.32769: 22-33-44-55-66-78

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多项选择题

Which two protocols are used by bridges and/or switches to prevent loops in a layer 2 network? （）

A.802.1d
B.VTP
C.802.1q
D.STP
E.SAP

单项选择题

What is the function of the command switchport trunk native vlan 999 on a switch?（）

A.It designates VLAN 999 for untagged traffic.
B.It blocks VLAN 999 traffic from passing on the trunk.
C.It creates a VLAN 999 interface.
D.It designates VLAN 999 as the default for all unkown tagged traffic.

单项选择题

Refer to the exhibit.Switch-1 needs to send data to a host with a MAC address of 00b0.d056.efa4.What will Switch-1 do with this data?（）

A.switch-1 will drop the data because it dose not have an entry for that MAC address
B.switch-1 will flood the data out all of its port from which the data originated
C.switch-1 will forward the data to its default gateway
D.tch-1 will send an ARP request out all its ports except the port from which the data originated