200-301 Question 148
Select 2A network administrator is troubleshooting a connectivity issue in a Layer 2 switched network. They discover that two switches connected via a trunk link are experiencing broadcast storms, which is causing network performance degradation. Which of the following concepts or technologies would help prevent this issue?
- A
Spanning Tree Protocol (STP)
- B
VLAN Trunking Protocol (VTP)
- C
Port Security
- D
EtherChannel
- E
Switch MAC Address Table
Show answer and explanation
Correct answers: A, D
Explanation
Broadcast storms in a Layer 2 network generally occur due to switching loops. Spanning Tree Protocol (STP) is the primary mechanism to prevent these loops by ensuring a loop-free topology. Additionally, EtherChannel can be used to aggregate links while maintaining loop prevention with STP. Other options like VTP, Port Security, and the MAC address table do not directly address broadcast storms or loops.
- A. Correct.
Spanning Tree Protocol (STP) is designed to prevent broadcast storms by eliminating Layer 2 loops through creating a loop-free topology in a switched network.
- B. Incorrect.
VLAN Trunking Protocol (VTP) is used for managing VLAN configurations across multiple switches but does not directly prevent broadcast storms.
- C. Incorrect.
Port Security is a feature used to restrict access to a switch port based on MAC addresses but does not address broadcast storms.
- D. Correct.
EtherChannel combines multiple physical links into a logical one, which can help prevent loops when used with STP, indirectly aiding in resolving broadcast storms.
- E. Incorrect.
The MAC address table maps MAC addresses to switch ports for forwarding frames but does not prevent loops or broadcast storms.