VCP-VCF Administrator 2024 Question 340
Single answerA VMware Cloud Foundation administrator is troubleshooting an issue where traffic is not being evenly distributed across backend servers in an NSX-T load balancer. Upon investigation, the administrator notices that all traffic is being directed to a single backend server. What is the most likely cause of this issue?
- A
The load balancing algorithm is set to 'Round Robin'.
- B
Persistence is enabled and configured based on source IP.
- C
The backend pool members are incorrectly configured with the same IP address.
- D
The health monitor associated with the load balancer is failing for other backend servers.
Show answer and explanation
Correct answer: B
Explanation
The issue is caused by session persistence, which is configured to keep traffic from the same source IP directed to the same backend server. This can lead to uneven traffic distribution, especially if there is a high number of connections from the same client. To resolve this, the administrator can review and adjust the persistence settings or load balancing algorithm to achieve the desired traffic distribution.
- A. Incorrect.
This is incorrect. The 'Round Robin' algorithm distributes traffic evenly among backend servers and would not cause all traffic to go to a single server.
- B. Correct.
This is correct. When persistence is enabled, such as source IP-based persistence, traffic from the same client IP is directed to the same backend server, which can result in uneven distribution of traffic.
- C. Incorrect.
This is incorrect. While misconfiguring backend pool members with the same IP can cause routing issues, it would not specifically result in all traffic going to a single server unless all other servers are unreachable.
- D. Incorrect.
This is incorrect. If the health monitor is failing for some backend servers, the load balancer will exclude those servers from the pool, but it will not direct all traffic to a single server unless there is only one healthy server.