Designing Cisco Network Service Architectures (ARCH, legacy) — Question 13

When a site has Internet connectivity with two different ISP’s, which two strategies are recommended to avoid becoming a BGP transit site? (Choose two.)

Answer options

• A. Advertise all routes to both ISPs.
• B. Filter routes outbound to the ISPs.
• C. Accept all inbound routes from the ISPs.
• D. Filter routes inbound from the ISPs.
• E. Use a single service provider.

Correct answer: B, D

Explanation

The correct strategies to avoid becoming a BGP transit site are to filter routes inbound from the ISPs (D) and restrict routes sent out to the ISPs (B). Advertising all routes (A) and accepting all inbound routes (C) could lead to transit traffic that is not desired, while using a single service provider (E) does not address the issue of managing multiple ISPs effectively.