200-301 Question 47
Single answerA network engineer is designing a three-tier architecture for an enterprise network. They need a solution to ensure scalability and efficient routing between the access layer and the core layer. Which of the following design choices would be most appropriate?
- A
Implementing a Layer 2 switch-only design at the distribution layer
- B
Using multilayer switches with routing capabilities at the distribution layer
- C
Directly connecting the access layer to the core layer to simplify the design
- D
Deploying redundant routers only at the core layer for failover
Show answer and explanation
Correct answer: B
Explanation
In a three-tier architecture, the distribution layer is a critical intermediary between the access and core layers. It is responsible for routing, load balancing, and policy implementation. Deploying multilayer switches at the distribution layer provides advanced routing and scalability, making this the best design choice.
- A. Incorrect.
Implementing a Layer 2 switch-only design at the distribution layer may limit scalability and routing efficiency because Layer 2 devices cannot perform advanced routing functions, which are essential for a three-tier architecture.
- B. Correct.
Using multilayer switches with routing capabilities at the distribution layer is the correct choice as it ensures efficient routing, load balancing, and scalability between the access and core layers in a three-tier architecture.
- C. Incorrect.
Directly connecting the access layer to the core layer bypasses the distribution layer, which is against the principles of a three-tier architecture. This design can lead to scalability and management challenges.
- D. Incorrect.
Deploying redundant routers only at the core layer provides failover at the core but does not address the need for efficient routing and traffic management at the distribution layer.