Networking - Spanning Tree Protocol - Discussion

Discussion :: Spanning Tree Protocol - Spanning Tree Protocol (Q.No.1)

1. 

What is the purpose of Spanning Tree Protocol in a switched LAN?

[A]. To provide a mechanism for network monitoring in switched environments
[B]. To prevent routing loops in networks with redundant paths
[C]. To prevent switching loops in networks with redundant switched paths
[D]. To manage the VLAN database across multiple switches
[E]. To create collision domains

Answer: Option C

Explanation:

The Spanning Tree Protocol (STP) was designed to stop layer 2 loops. All Cisco switches have the STP on by default.

Sundar said: (Jan 14, 2012)  
Spanning Tree Protocol (STP) is a Layer 2 protocol that runs on bridges and switches. The specification for STP is IEEE 802.1D. The main purpose of STP is to ensure that you do not create loops when you have redundant paths in your network. Loops are deadly to a network.

Pratyush Sinha said: (Mar 20, 2013)  
Why are loops deadly to a network?

We might lose some packets or most of the bandwidth would be consumed because of the loops. Is there any other disadvantage of having loops ?any other more significant reason than the above mentioned.

Nagesh said: (Jul 27, 2015)  
Switching loops are deadly when there is a redundant switch connections and which makes the switching environment loop. If any broadcast message enters this kind of looped switching environment which create broadcast storm which is deadly in switching environment.

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