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ANS-C01: AWS Direct Connect Optimizing BGP Configuration for Secondary Link Usage

Master the art of configuring BGP for AWS Direct Connect links! Learn how to prioritize af-south-1 as a secondary link using community tags and local preference values for efficient network routing.

Table of Contents

Question

A company has two AWS Direct Connect links. One Direct Connect link terminates in the us-east-1 Region, and the other Direct Connect link terminates in the af-south-1 Region. The company is using BGP to exchange routes with AWS.

How should a network engineer configure BGP to ensure that af-south-1 is used as a secondary link to AWS?

A.

On the Direct Connect link to us-east-1, configure BGP peering to use community tag 7224:7100
On the Direct Connect link to af-south-1, configure BGP peering to use community tag 7224:7300
On the Direct Connect BGP peer to us-east-1, set the local preference value to 200
On the Direct Connect BGP peer to af-south-1, set the local preference value to 50

B.

On the Direct Connect link to us-east-1, configure BGP peering to use community tag 7224:7300
On the Direct Connect link to af-south-1, configure BGP peering to use community tag 7224:7100
On the Direct Connect BGP peer to us-east-1, set the local preference value to 200
On the Direct Connect BGP peer to af-south-1, set the local preference value to 50

C.

On the Direct Connect link to us-east-1, configure BGP peering to use community tag 7224:7100
On the Direct Connect link to af-south-1, configure BGP peering to use community tag 7224:7300
On the Direct Connect BGP peer to us-east-1, set the local preference value to 50
On the Direct Connect BGP peer to af-south-1, set the local preference value to 200

D.

On the Direct Connect link to us-east-1, configure BGP peering to use community tag 7224:7300
On the Direct Connect link to af-south-1, configure BGP peering to use community tag 7224:7100
On the Direct Connect BGP peer to us-east-1, set the local preference value to 50
On the Direct Connect BGP peer to af-south-1, set the local preference value to 200

Answer

C.

On the Direct Connect link to us-east-1, configure BGP peering to use community tag 7224:7100
On the Direct Connect link to af-south-1, configure BGP peering to use community tag 7224:7300
On the Direct Connect BGP peer to us-east-1, set the local preference value to 50
On the Direct Connect BGP peer to af-south-1, set the local preference value to 200

Explanation

The correct configuration to ensure that af-south-1 is used as a secondary link to AWS is Option C. Here’s the breakdown:

  • For the Direct Connect link to us-east-1, the BGP peering is configured to use community tag 7224:7100.
  • For the Direct Connect link to af-south-1, the BGP peering is configured to use community tag 7224:7300.
  • The local preference value is adjusted: set to 50 for the Direct Connect BGP peer to us-east-1 and set to 200 for the Direct Connect BGP peer to af-south-1.

This setup ensures that af-south-1 is designated with a higher local preference value (200), making it more preferred over the us-east-1 connection, which has a lower local preference value (50). The community tags help distinguish the routes, allowing proper differentiation between the two Direct Connect links.

AWS Certified Advanced Networking – Specialty ANS-C01 certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the AWS Certified Advanced Networking – Specialty ANS-C01 exam and earn AWS Certified Advanced Networking – Specialty ANS-C01 certification.

Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook

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