Q23 — AWS ANS-C01 Ch.1

Question 23 of 100 | ← Chapter 1

A company has two on-premises data center locations. There is a company-managed router at each data center. Each data center has a dedicated AWS Direct Connect connection to a Direct Connect gateway through a private virtual interface. The router for the first location is advertising 110 Routes to the Direct Connect gateway by using BGP, and the router for the second location is advertising 60 routes to the Direct Connect gateway By using BGP. The Direct Connect gateway is attached to a company VPC through a virtual private gateway.A network engineer receives reports that resources in the VPC are not reachable from various locations in either data center. The network Engineer checks the VPC route table and sees that the routes from the first data center location are not being populated into the route table. The Network engineer must resolve this issue in the most operationally efficient manner. What should the network engineer do to meet these requirements?

• A. Remove the Direct Connect gateway, and create a new private virtual interface from each company router to the virtual private gateway of The VPC.
• B. Change the router configurations to summarize the advertised routes. ✓
• C. Open a support ticket to increase the quota on advertised routes to the VPC route table.
• D. Create an AWS Transit Gateway. Attach the transit gateway to the VPC, and connect the Direct Connect gateway to the transit gateway.

Correct Answer: B. Change the router configurations to summarize the advertised routes.

Explanation

本题考查Direct Connect网关路由传播限制及BGP路由汇总的应用。AWS虚拟私有网关(VGW)默认每个路由表支持100条动态路由，超过上限将导致路由丢失。第一个数据中心通过BGP宣告110条路由已超出配额，需通过路由聚合减少通告数量。修改路由器配置进行路由汇总（选项B）能够以最小操作成本解决路由表容量限制，确保所有必要路由成功注入VPC，恢复网络连通性。其他选项涉及架构变更或配额申请，均非最简方案。