What is the Spanning Tree Protocol used for
Spanning tree protocol is used to prevent looping of frames. Unlike IP, which has a TTL value field in the packet which is decremented every time the packet passes through a router and is dropped once the value reaches 0, the frame does not have any similar field. So if a scenario arises where a frame is looping in a switched environment, the frame would not automatically time out. The spanning tree protocol is used for preventing the looping.
Can STP be configured on a router
STP can be configured only on switches and not on routers. STP is used to prevent frame looping
Is STP required to be configured when there is only one switch involved.
It is not required. STP is used to shutdown redundant links between switches to prevent loops.
Is a generic ethernet frame modified when STP is configured on the network
STP is a protocol. It has it’s own frame when configured. So it would not affect a generic ethernet frame on the network.
How many designated ports can be available on a root bridge
All ports on a root bridge is designated ports.
How many root bridges can be available on a STP configured network
If the priority value of the two switches are same, which switch would be elected as the root bridge
The switch with the lowest mac-address value would be elected as the root bridge
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