350-401 Question 117
Single answerA network engineer is tasked with configuring a redundant Layer 2 topology between two data centers connected by multiple links. The engineer wants to ensure that loops are avoided while also maximizing the use of all available links. Which protocol or feature should the engineer implement to meet these requirements?
- A
Spanning Tree Protocol (STP)
- B
Rapid Spanning Tree Protocol (RSTP)
- C
EtherChannel
- D
Multiple Spanning Tree Protocol (MSTP)
Show answer and explanation
Correct answer: C
Explanation
EtherChannel is the correct solution in this scenario because it allows multiple physical links to operate as a single logical link, providing redundancy without creating loops and maximizing the use of all available bandwidth. In contrast, protocols like STP, RSTP, and MSTP inherently block redundant paths to prevent loops, which results in underutilization of available links.
- A. Incorrect.
Spanning Tree Protocol (STP) can prevent loops but does not utilize all available links, as it blocks redundant paths.
- B. Incorrect.
Rapid Spanning Tree Protocol (RSTP) improves convergence times over STP but still blocks redundant links, failing to maximize link utilization.
- C. Correct.
EtherChannel groups multiple physical links into one logical link, enabling loop-free redundancy and maximizing the usage of all links.
- D. Incorrect.
Multiple Spanning Tree Protocol (MSTP) maps VLANs to instances of STP, but like STP and RSTP, it blocks redundant links, which does not maximize the use of all links.