Which protocol disables redundant paths to eliminate Layer 2 loops?

Which protocol disables redundant paths to eliminate Layer 2 loops?

• A. RIP
• B. STP
• C. OSPF
• D. EIGRP

Answer: (B)

The correct choice is STP, which stands for Spanning Tree Protocol. STP is specifically designed to prevent Layer 2 loops in a network that utilizes Ethernet switches. In networks where multiple redundant paths exist, these loops can cause broadcast storms and multiple frame copies, ultimately leading to network failure. STP operates by creating a spanning tree that determines which paths between switches are active and which should be put in a blocking state to prevent loops. By doing this, STP ensures that there is only one active path between any two devices on the network, effectively managing network traffic and enhancing reliability. Protocols such as RIP, OSPF, and EIGRP are routing protocols that operate at Layer 3. They are used for routing packets between different networks; therefore, they do not play a role in managing loops at Layer 2. Thus, STP is the appropriate protocol for handling redundant paths and preventing loops in switched networks.

The correct choice is STP, which stands for Spanning Tree Protocol. STP is specifically designed to prevent Layer 2 loops in a network that utilizes Ethernet switches. In networks where multiple redundant paths exist, these loops can cause broadcast storms and multiple frame copies, ultimately leading to network failure.

STP operates by creating a spanning tree that determines which paths between switches are active and which should be put in a blocking state to prevent loops. By doing this, STP ensures that there is only one active path between any two devices on the network, effectively managing network traffic and enhancing reliability.

Protocols such as RIP, OSPF, and EIGRP are routing protocols that operate at Layer 3. They are used for routing packets between different networks; therefore, they do not play a role in managing loops at Layer 2. Thus, STP is the appropriate protocol for handling redundant paths and preventing loops in switched networks.