300-420 Question 212
Single answerA small enterprise is planning to connect its branch office to a single Internet Service Provider (ISP) using a single-homed design. Which of the following is a key consideration when implementing this topology to ensure network resiliency?
- A
Implementing a secondary ISP link for failover
- B
Configuring static routing for simplicity and reliability
- C
Deploying dual routers for redundancy within the single-homed setup
- D
Ensuring the ISP provides adequate Service Level Agreements (SLAs)
Show answer and explanation
Correct answer: D
Explanation
In a single-homed design, the enterprise is completely reliant on one ISP for connectivity. Therefore, it is essential to ensure that the ISP can meet the organization's performance and availability requirements through well-defined SLAs. Other options, such as adding a secondary ISP or dual routers, would alter the design or not address the core dependency on the single ISP.
- A. Incorrect.
While implementing a secondary ISP link would improve resiliency, it would change the topology from single-homed to dual-homed, so it is not applicable here.
- B. Incorrect.
Static routing is simple but does not inherently ensure resiliency in case of ISP or link failure.
- C. Incorrect.
Deploying dual routers would add redundancy locally, but it does not address the dependency on the single ISP in a single-homed design.
- D. Correct.
Ensuring the ISP provides adequate SLAs is critical in a single-homed design because the enterprise relies entirely on one ISP for connectivity. SLAs help guarantee uptime and performance.